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User Manual

§  WARNING: When using this product, always follow basic precautionary measures, Including the following: 

·       Before using this product, please read all instructions. 

·       To reduce the risk of injury, closely supervise this product when used near children. Do not put fingers or hands into the product. 

·       If the power cord or other wires are worn, the insulation is damaged, or there are any other signs, do not use this product to avoid danger. 

·       The device is not suitable for use in ambient temperatures below -4°F (-20°C) or above 113°F (45°C). 

·       The battery should be charged when the ambient temperature is between 32°F (0°C) and 104°F (40°C). Never charge the battery when the ambient temperature is outside this range. 

§  WARNING: You need to comply with all relevant traffic regulations and use appropriate equipment, including proper cycling clothing and bicycle maintenance. 

§  Always wear a suitable helmet that covers the forehead when cycling. Many regions require specific safety devices. You are responsible for familiarizing yourself with local laws, regulations, and rules, and complying with all applicable laws. The bicycle equip- ment must be equipped according to regulatory requirements. 

§  Unless otherwise stated, the rider's weight and luggage should not exceed 400 pounds/181 kilograms. 

§  Before riding a bicycle, be sure to check and ensure that all devices are properly assem- bled and working properly. Familiarize yourself with the bicycle's control devices, such as brakes, pedals, and gears. 

§  When pedaling, all parts of the body and any protruding objects should maintain a safe distance from the chainring. Wear suitable clothing to prevent injuries.  

§  Stay focused while cycling and be prepared to deal with any potentially dangerous situations at any time. 

§  ①  All types and all directions of motor vehicles; 

§  ②  Unexpected movement of obstacles; 

§  ③ Nearby pedestrians; 

§  ④  Children or animals in the area;  

§  ⑤ Poorly maintained bike lanes or paved roads, including uneven surfaces, loose gravel structures, and debris; 

§  ⑥  Warning, hazard, and danger signals. 

§  Ride on enclosed bike lanes as much as possible, and do not ride against traffic. 

§  Follow traffic lights or traffic signs. 

§  When approaching street intersections, slow down or stop to observe incoming vehicles or pedestrians. 

§  Raise your hand to signal slow down when turning. 

§  Do not wear headphones while cycling. 

§  Never grab onto another vehicle. 

§  Do not weave through traffic or make sudden moves or turns. 

§  Yield to pedestrians. 

§  Drinking and driving or driving while fatigued is strictly prohibited. 

§  Avoid riding in poor visibility and adverse weather conditions, such as at dawn or in darkness, as this can increase the risk of accidents. 

§  Try to avoid cycling in wet weather. Only ride in the rain when neces- sary. The electric bike is not suitable for use in heavy rain or in places with deep water. Do not immerse or submerge this product in water or liquid, as the electrical system may be damaged. 

·       Be extra careful when riding in wet weather; 

·       Slow down to reduce risk; 

·       Brake in advance, as it takes longer to slow down and stop compared to dry conditions; 

·       Enhance your visibility. Wear reflective clothing, use approved lights; 

·       Wet weather is more likely to cause road hazards, be cautious. 

·       Do not leave the e-bike out in the rain. 

§  Riding at night should be done with extra caution. Cyclists can be hard to spot in the dark by drivers and pedestrians, making night riding more dangerous than riding during the day. Always remember, choosing appropriate clothing and specific equipment to reduce the risk of injury when riding under adverse conditions is important. Warning! Reflectors cannot replace the required lights. Without the necessary lights and reflective devices, it can be difficult for other cyclists and motorists to see the rider. If riding at night, take all necessary precautions to make yourself more visible through lights and reflectors. If the visibility of the cyclist is too low, it may result in serious injury or death. Reflectors can be used to reflect the light from cars and street lamps when the rider is moving, helping you become clearer and more visible when riding. 

§  WARNING: Regularly check the reflectors and their mounting brackets to ensure that the reflectors are clean and firmly attached. Check and make sure you comply with all local laws regarding night riding. 

§  The following measures are recommended: 

·       You can enhance your visibility by wearing reflective clothing and accessories. There are many suitable reflective gear options such as vests, armbands, straps, stripes on helmets, and flashing lights that can be attached to your person. 

·       Ensure that your clothing or other items do not obstruct the visibility of your reflective devices and lights. 

·       Make sure your bike is equipped with reflectors. 

·       Slow down when cycling at night. 

General Safety

§  The charger should only be used indoors, in a cool, dry, well-ventilated area, on a flat and stable surface. 

§  Avoid the charger encountering liquids, dust, debris, or metallic objects, and do not cover the characters when in use. 

§  Store or use the charger in a safe place out of reach of children. 

§  Charging the battery fully before each use can help extend the battery life and reduce the number of times it is excessively used. 

§  Do not use any charger other than the one originally provided by AIMA, or a charger specifically designed for bicycles purchased directly from AIMA to charge the battery. 

§  The charger operates on a standard 110/240V 50/60Hz household AC power outlet and automatically detects and calculates the input voltage. Do not open the charger or modify the voltage input.  

§  Do not move or pull the charger's wires. When charging is finished, carefully remove the AC and DO wires by pulling directly on the plastic plug rather than the wire. 

§  The charger will become relatively hot during charging. If the charger becomes too hot to touch, emits strange odors, or shows any other signs of overheating, stop using the charger and contact the AIMA support department. 

§  WARNING:Only use the original charger provided by AIMA or a charger purchased directly from AIMA to charge the battery. This charger is approved by AIMA and specifically designed for your specific bicycle serial number. Do not use aftermarket chargers, as they may cause damage, serious injury, or death. 

§  WARNING:Read the procedures and safety information detailed in this manual carefully before charging your bike. Failure to follow the correct charging procedures may result in damage to the bike, charger, or personal property, and can lead to serious injury or death. 

§  Please pay special attention to all the following general operating rules before operating your bike from AIMA:  

·       When riding, comply with all local road regulations applicable to other road vehicles.  

·       For more information on traffic or vehicle laws, please contact your local road traffic management agency. Never ride against traffic.  

·       Use the correct hand signals for turning.  

·       Always be aware of the vehicles around you. Other vehicles or pedestrians may find it difficult to see you.  

·       Concentrate on riding. Avoid potholes, gravel, wet or oily roads, wet leaves, curbs, ruts, speed bumps, drains, thorns, messy grasslands, and other obstacles.  

·       Cross train tracks at the shortest distance.  

·       Be alert to dangerous situations, such as cars opening doors or reversing.  

·       Be careful at intersections or when preparing to overtake. 

·       Familiarize yourself with all the features and operations of Big Sur Bikes. 

·       Before riding under more dangerous conditions, practice using the pedal assist system more and use the throttle within a controllable range. 

·        Wear appropriate cycling clothes and shoes. If you wear loose pants, secure the pants legs with leg clips or elastic bands to prevent them from being caught in the chain or gears. Do not use items that might obstruct your hearing.  

·       Before transporting goods, please check your local regulations.  

·       When braking, press the rear brake first, then the front brake. If not braked correctly, they may lock up, causing you to lose control or fall. 

·       Maintain a proper stopping distance from all other objects, passengers, and vehicles.  

Weather conditions can severely affect the safe braking distance.

§  The following safety notes provide additional information for safe operation of Big Sur bicycles. Failure to read these notes could result in serious injury or death. 

·       All users must read and understand this manual before riding a Big Sur Bike. Additional manuals may also be provided for parts used on the bike, which should be read before installing or using these parts. 

·        Make sure you understand all instructions, safety precautions, and warnings.  

·       Before first use, ensure the bike fits you. If the bike is too big or too small, you may lose control or fall.  

·       Always wear a qualified bicycle helmet when riding. Follow the helmet manufacturer's instructions for wearing and maintaining your helmet. Riding without a helmet could result in serious injury or death.  

·       Before using the bike for the first time, make sure it is set up correctly, tightened and torqued to the recommended values, and regularly check the setup and safety status of parts and hardware.  

·       You must be familiar with the laws and requirements for bicycles in your area.  

·       Ensure the handlebar grips are in good condition and correctly installed. Loose or damaged grips can cause the vehicle to lose control and fall. 

·       Do not use this product with standard bicycle trailers, standard frames, or accessories, as Big Sur has not tested their safety and compatibility, nor verified their safety and compatibility.  

·       Off-road riding may involve uncertain risks. Wear appropriate safety gear and do not ride alone in remote areas. Check local laws regarding whether off-road riding is allowed.  

·       Do not engage in extreme riding. This includes, but is not limited to, jumping, stunts, or any riding beyond your ability. Although many articles, ads, and catalogs describe extreme riding, it is not recommended or allowed. If you engage in extreme riding, you may be seriously injured or killed.  

·       Bicycles and bicycle parts have strength and intensity limits, and should not be used for extreme riding, including but not limited to jumping, stunts, etc., as this may damage bicycle parts or cause dangerous riding conditions, which could result in serious injury or death.  

·       Failure to verify the correct installation, compatibility, correct operation, or maintenance of any parts or accessories could result in serious injury or death.  

·       After any accident, the bike needs to be checked for safety until a thorough check of all parts, functions, and operations of the bike is carried out by an experienced bike repair master. 

·       The warranty will be void if the battery is not correctly charged, stored, or used.  

·       Before each ride, check if the braking motor can cut off the power. The brake system is equipped with a suppressor that cuts off the power of the electric motor as soon as you brake. Before riding, check if the brake motor cut-off function is working properly.  

·       Extra care should be taken when using pedal assist sensors and throttles on this product. Ride after familiarizing yourself with the operation of pedal assist devices and throttles to ensure immediate start-up when pedaling.  

·       Before using the bike, the user must understand the operation of the thumb switch throttle and pedal assist sensor and must be careful to travel at speeds suitable for the riding environment, riding conditions, and user experience level. Maintain the lowest assistance level until you feel comfortable driving the bike and confident in controlling the power. 

·       Any after-sales modification to your bike by AIMA without explicit approval may void the warranty and pose a riding hazard.  

·       Electric bicycles are heavier and faster than regular bicycles, so extra care is needed when riding.  

·       Extra care should be taken when riding in wet conditions, it is advisable to reduce speed and increase braking distance. The bike is more likely to slip under wet conditions, which could lead to serious injury or death.  

·       Do not remove any relays 

·       WARNING: Like any sport, riding a bicycle carries the risk of damage, injury, and death. Choosing to ride a bicycle means accepting the responsibility for this risk, so riders need to ride safely, know the rules of cycling, and properly use and maintain this bicycle. Proper use and maintenance of the bicycle can reduce the risk of injury and death. Never operate a bicycle under the influence of alcohol or drugs. Big Sur is suitable for people over 16 years old. Riders must have the physical condition, reaction time, and stamina to ride safely, manage traffic conditions, and handle emergencies, and must comply with the laws for the use of electric bicycles, regardless of age. If you have an injury or disability, such as a visual impairment, hearing impairment, physical disability, cognitive or language impairment, epilepsy, or any other physical condition that may affect your safe operation of the vehicle, please consult a doctor before riding a bicycle.  

·       WARNING: Big Sur is not responsible for any accidents, injuries, or product failures resulting from any unauthorized changes, modifications, or tampering with any part of the original specifications. 

·       Tips for Parents and Guardians As a parent or guardian, you are responsible for your child's activities and safety. Big Sur is not suitable for children under 18. If passengers are carried with a child safety seat, they should also wear a suitable helmet.  

Assembly and Installation

§  Before riding, ensure that all required and recommended safety equipment is met and comply with all local laws related to the use of electric bicycles. For example, the law may stipulate the need for mandatory equipment, the installation of license plates, or the areas where riding is permitted. 


§  WARNING: Using non-original parts or spares can jeopardize the safety of your bicycle, impede warranty, and may also result in the bicycle not complying with local bicycle regulations. You bear the risks associated with replacing original components or installing third-party accessories or attachments not provided by AIMA. Using aftermarket accessories or components not tested by AIMA for safety and compatibility may create unsafe riding conditions, damage AIMA's property or your bicycle, and may lead to serious injury or death. 


Pre-Ride Safety Check

§  The electrical system powers several components on your E-Bike, controlling various operating conditions and user preferences. Most importantly, you need to familiarize yourself with the electrical system of your e-bike and check whether it is working properly before each ride. Both the front and rear brake levers contain safety power cut-off switches, which disable the hub motor assist when used and should be checked for correct operation of both levers. Gradual throttle rotation should result in smooth acceleration. If the throttle doesn't rotate, the pedal assist device or lighting device intermittently malfunctions, or fails, stop using your E-Bike immediately and contact the AIMA support team for help 

§  Make sure that the brakes and their system components are undamaged, correctly fixed, and functioning properly. Neither the front nor the rear brake levers should touch the handlebars. If you find any issues with the brakes, take the bicycle to an experienced bicycle repairer for fixing. 

The wheels should always rotate in a straight line; if they sway side to side or bob up and down during rotation, they need to be repaired or replaced. If the wheel becomes unstable or the spokes are loose, this may affect normal use. It is recommended to have a bicycle repairman make all wheel adjustments and truing for your bicycle. Unless you have sufficient knowledge, tools, and experience, do not attempt to true the wheel or tighten the spokes. Ensure that the tires and inner tubes are in good condition, with no visible damage, and that the air pressure is stable. Be sure to replace punctured or cut tires and inner tubes. Riding with damaged tires or tires without proper air pressure will decrease performance, increase wear on the tires and components, and make riding the bicycle unsafe.

§  Ensure all hardware is secured, and all approved accessories are correctly connected as per the specific component manufacturer's instructions. It's best to first check all hardware and accessories; if you find any problems or are unsure, seek help from an experienced bicycle repairer. 

§  The forks on your bicycle can affect its handling, so it's necessary to understand how they work before use. Adjust the fork appropriately according to your weight and terrain. Ensure the handlebars and stem are aligned to suit the user and tightened to the recommended torque value. Handlebar grips should not move easily on the ends of worn handlebars. Damaged handlebars should be replaced before riding, and the seat and seat post should be correctly aligned. Before riding, the seat post clamp should be appropriately tightened, fully closed, and secured. 

§  Make sure the battery is sufficiently charged and operates normally. Ensure the battery charger is unplugged from the socket and stored in a safe place before riding. Before use, the battery must be correctly locked in the battery slot. If the battery has been removed, do not operate the electrical system. When installing the battery into the battery slot, press it in hard until you hear a "click". 

Operating Instructions

§  The range of the bicycle is the distance the bicycle can travel when the onboard battery is fully charged. The range values in this manual are estimated based on the expected characteristics of bicycle use. Some factors affecting the range include altitude, speed, payload, accelera- tion, number of starts and stops, ambient temperature, tire pressure, and terrain variations. We recommend that when you purchase a bicycle from Big Sur Bikes for the first time, you choose a lower assistance level to familiarize yourself with your bicycle and your travel route. Once you are familiar with your travel route and the performance of your bicycle, you can adjust your riding characteristics if you wish. The table below 

§  provides general mileage estimates based on various factors. This table is intended to help owners understand the factors that lead to reduced mileage but does not make any claims about the mileage that individual users may experience under specific usage conditions. 

o    Range                            Riding environment 

     * 32 km (20 mi)             Hilly terrain, heavy body shape, more loads, maximum speed or full throttle cruise

     * 45 km (30 mi)             Flat road surface, rider weight 75kg, no wind, moderate pedal assist,

                                             steady speed of 15 mi/h 

     * 96 km (60 mi)             Flat road surface, rider weight 75kg, no wind, low pedal assist,

                                              steady speed of 12 mi/h

§  Please follow these basic parking, storage, and transportation tips to ensure your bicycle is well cared for on and off the road. 

·       When manually pushing or carrying your bicycle, please turn off the power to prevent the motor from accidentally accelerating. 

·       Turn off the power and any lights. 

·       Make sure the battery is locked in the off position on the frame or use a key to remove the battery and carry it with you to ensure safety or store it in a temperature-controlled location. 

·       Park indoors as much as possible. If you must park outside in the rain or wet conditions, just leave your bike outside for a few hours, then park it in a dry place as soon as possible to let all systems dry out. Just like regular bicycles, bicycles used in damp conditions require more frequent maintenance to prevent rusting, corrosion, etc., to ensure that all systems work safely. 

·       In public places, your Big Sur Bikes bicycle must be parked in accordance with local regulations." 

§  Follow the steps below to charge your bicycle: 

1.              Ensure the power is turned off. 

2.              Remove the rubber cap on the charging port. 

3.              Plug the charger into the battery's charging port before plugging the charger into the power outlet. Leave the battery on the bike or take it off, place the charger in a flat and safe place, and connect the DC output plug from the charger (cylindrical connector) to the charging port on the side of the battery. 

4.              Plug the charger into the power outlet. Connect the charger input plug (110/240-volt plug) to the power outlet. Charging should start, and the LED charging status light on the charger will show a steady red. 

5.              Unplug the charger from the charging port. When fully charged, a charging indicator light will turn green. First, unplug the charger from the wall outlet, then unplug the charger output plug from the battery charging port. 

6.              Battery indicator light: Blue: 80%-100% Green: 33%-80% Red: 0%-33%. 

§  Please make sure to charge the battery at a temperature between 32°F-104°F (0°C-40°C) and ensure that the battery and charger are undamaged before starting to charge. If you notice any abnormalities while charging. Please stop charging and using the bike and contact AIMA bike product support for help. 

1.     The battery should be fully charged when the new vehicle is used for the first time. 

2.     After each use of the vehicle, it should be charged as soon as possible. This is beneficial for prolonging the service life of the battery. 

3.     During the use of the battery, over-discharge, under-charging, and overcharging are prohibited to prevent damage to the battery and shorten the service life of the battery. 

4.     The battery should not be near open flames or high-temperature heat sources. Exposure to the sun is strictly prohibited in high-temperature seasons to avoid damaging the battery. 

5.     It is recommended to perform a deep discharge of the battery regularly, generally once a month is appropriate. That is: long-distance riding until the undervoltage indicator light shows that the power is exhausted or the undervoltage protection device starts to work. At this time, turn off the power for charging, which can effectively extend the service life of the battery. 

6.     If the vehicle is not used for a long time, cut off the power and remove the battery from the vehicle for storage. The battery is best placed in a cool place. If stored for 20-30 days, it must be recharged once. 

7.     Old batteries should not be dismantled by themselves, and they should be organized and recycled by relevant professional departments. 





① The battery is the key component of the electric vehicle. It should be used correctly and well protected. Users who are able should charge it whenever they use it, for example, if the daily travel distance is more than 20 kilometers, it should be charged daily. 


② The performance of the battery is greatly affected by the ambient temperature. When the temperature drops below 0°C, the discharge capacity of the battery may decrease by more than one quarter. Therefore, in winter or cold areas, it is normal for the mileage of a single charge to decrease when the temperature rises above 20°C, its performance will automatically recover. 


③ Do not discard old batteries at will to avoid polluting the environment. The waste batteries of this product are recycled by AIMA dealers, AIMA after-sales service department, or government-designated outlets." 

1.              Regularly check whether the screws on both sides of the motor end cover are loose. 

2.              Regularly check whether the motor wiring is loose, whether there is any deformation in appearance, and whether there is any damage to the motor phase wire. 

3.              When using in rainy days, do not let the motor drive in deep water, and do not let the water level exceed the position of the rear wheel axle. 

4.              The motor hub should not be subjected to violent impacts, and the motor should not be forced to run when it is jammed, and overload of the motor is strictly prohibited. 

5.              If you find that the motor is running abnormally, stop running immediately and send it to AIMA dealers or AIMA after-sales service department for repair or replacement. 


1.              Disconnect the power supply of the entire vehicle before cleaning, and do not touch the electrified parts, such as the battery charge and discharge ports, with wet hands or metal conductors. 

2.              It is strictly forbidden for water to impact electrical components. When cleaning the vehicle, a damp cloth should be used to wipe the appearance of the entire vehicle. 

3.              Avoid water impact on the charging plug, wire harness connector and fuse, etc., and do not directly splash water into the storage box, etc. 

4.              Do not directly splash water towards the brake, motor and front and rear axle areas to prevent water from affecting the life of the vehicle parts. 

5.              Do not use steam or high-pressure water pipes to wash the vehicle. 

No             Component               Interval                                                   Maintenance                         

1          Front Fork Assembly         1 year              Add grease (calcium-based lubricating grease) 

2          Front and Rear Axle           1 Year             Add grease (calcium-based lubricating grease) 

3          Bottom Bracket                   1 Year             Add grease (calcium-based lubricating grease) 

4           Pedal Crank                        1 Year            Add grease (calcium-based lubricating grease) 

5             Chainring                                  1 Week            Clean and lubricate 

6             Chain                                         1 Year              Clean and lubricate

7             Internal Freewheel                   1 Month           Apply lubricating oil

8             Brake Lever                              1 Month           Apply lubricating oil 


o   The warranty for Aima E bike to the original retail purchaser for a duration of two (2) years from the date of the original retail purchase. 

§  Frame components.  

·       Frame, Rear Swing arm, Front Fork, Wheel, Handlebars, Seat Post. Expanders, Support Frames, Front and Rear Drum Covers. Please note that paint and graphics are not included in this warranty. Warranty Failure Types: Natural Welding Cracks, Detachment, Fracture.  

·       Painted Parts, Plated Parts. Warranty Failure Types: Large-scale Paint Peeling, Fading, Bubbling, Cracking.  

·       Saddle, Rear Carrier, Rearview Mirror. Warranty Failure Types: Cracking and Breakage. 

·       Front and Rear Shock Absorbers. Warranty Failure Types: Quality issue caused by manufacturing defects such as natural deformation and fracture.  

§  Electrical Components 

·       Controller, Charger, Display Console, Throttle, Brake Lever, Main Wiring Harness, Horn, Alarm, Turn Signal, Headlight Assembly, Rear Taillight, Flasher, Converter, Power Lock, Combination Switch. Warranty Failure Types: Performance failure due to manufacturing defects and irreparable.  

·       Electric Motor: Defect, burnout, demagnetization, quality issues. 

·       Hall Bearings, Clutch Bearings: Hall sensor burnout, abnormal bearing noise. 

·       Lithium Battery. Warranty Failure Types: If the battery experiences cell dropout, failure to hold a charge, or capacity

o   We suggest you reach out to the dealership where you purchased the item first. Provide them with details about the issue you're experiencing and explain that you would like to initiate a warranty claim. The dealer will guide you through the necessary steps and provide you with the appropriate instructions. 

§  We cordially invite you to submit a warranty request form by clicking on the provided link.  Your prompt action will allow us to efficiently process and address your warranty-related needs