Big Sur 26" Ebike

$1,999.00

Out of Stock

Description

Big Sur is a 26 x 4” fat tire all-terrain e-bike, equipped with a powerful 750W Bafang rear hub motor. Big Sur is Class 2/3, meaning it'll take you up to 20mph using the throttle, and 28mph while pedaling. A specially-designed big headlight, extra-large 203mm brake rotors, LG 21700 battery cells, and a full UL2849 certification make Big Sur one of the safest e-bikes on the market. Sporting a bigger 52T crankset for stability at speed and a custom AIMA Comfort XL seat, Big Sur provides riders with a remarkably comfortable and smooth riding experience.

Technical Specifications

MODEL

Big Sur

MOTOR

750W (Rated) / 1200W (Peak) , 48V Brushless Rear Hub Motor

THROTTLE

Throttle on Demand

DISPLAY

Color LCD, Smart Easy-to-Read Display with Backlight

SPEED

Up to 28 MPH Pedal Assist, 20 MPH Throttle Only

BATTERY

Removable Internal Lithium-ion 48V, 15Ah (720Wh) with LG M50LT 21700 cells

REAR RACK

MIK HD

SENSORS

Torque Sensor

PEDAL ASSIST

5 Levels

CHARGER

48V 3 Amp Fast Charger, about 5 Hours to a Full Charge

RANGE

30 to 60 Miles

FRAME

6061 Single-Butted Aluminum Alloy Frame with Internal Battery

WEIGHT

82 lbs. ( Battery included)

PEDALS

9/16' Alloy Platform

FORK

Suspension Fork with 80mm travel, with lockout

WEIGHT LIMIT

400 lbs.

KICKSTAND

Included, Aluminum Alloy Kickstand 

CRANKSET

170mm w/ 52T

SHIFT

Shimano 8 Speed

GEAR RATIO RANGE

11-34T

BRAKES

Tektro Hydraulic Disc Brakes

ROTOR

203 mm

CHAIN

130 Link, 8 Speed

RIM

Double Wall Aluminum Alloy

SPOKES

Black Stainless 12G Front / 12G Rear

TUBES

Butyl Rubber

HUBS

Front Aluminum Alloy Disc Hub 

TIRES

26" x 4" Puncture Resistant

SADDLE

AIMA Comfort, 280mm*270mm Saddle

SEATPOST

Aluminum Alloy, 30.4mm 2-Bolt Clamp

STEM

Threadless, 31.8mm, 7 Degree Rise, Ext 75mm

SEAT CLAMP

34.9 mm Quick Release

HANDLEBARS

Aluminum Alloy Double Wall, 31.8mm, 680mm

HEADSET

Sealed Bearing Headset

GRIPS

Ergonomic Comfort

*Ebike Range: Explained

An e-bike's battery life is influenced by several factors that can affect its maximum range. While our e-bikes can achieve up to 60 miles of range under ideal riding conditions, range figures can drop below 40 or even 30 miles without keeping these factors in mind. Here's a list of the most common factors that affect range, as well as what you can do to maximize your riding time.

  • Pedal Assist: Higher levels of pedal assist will allow for an easier ride, but will also draw more power from the battery. Lower assist levels are better for getting as many miles as possible out of your battery.

  • Average Cruising Speed: Riding slower will decrease the amount of energy you lose to wind resistance as the bike pushes you forwards through the air. Slower speeds will extend battery life.

  • Tire Pressure: Fat tire bikes like Big Sur and Big Sur Sport can have their tires aired down beneath the pressure rating listed on the tire for better off-road performance, but this will lead to a increase in rolling resistance, and running too low of a pressure could raise your chances of a tube failure. For most riding situations, pumping up your tires every week or two to the recommended pressure shown on the side of the tire will keep your ride safe and energy-efficient.

  • Load Weight: This includes both the rider's weight and the weight of any cargo you may be carrying. More weight will take more time and energy to get up to speed, negatively affecting your range. It's best to keep loads light whenever possible if you're looking to extend your range.

  • Terrain & Elevation: In general, riding over smooth terrain with few to no changes in elevation will give you a longer range. Hills and rough terrain can greatly impact your maximum range, especially on higher assist levels.

  • Wind: Wind resistance is generated as you ride through the air, but it can also be generated by, well, the wind! Riding in heavy winds, especially if it's a constant headwind, will lead to a decrease in range. However, if you can catch a tailwind, you may actually be able to steal a bit of range back, as the wind would be traveling in the same direction as you are, effectively cancelling out any wind resistance you would generate on your own.

  • Ambient Temperature: Riding in cold weather will impact the battery's ability to function optimally, sometimes a lot more than you might think. This is a limitation imposed by the chemistry that allows our current battery tech to work. A good rule of thumb is, if you're comfortable (temperature-wise), then the battery is comfortable too. This also goes for storing the battery if you won't be riding for an extended period of time, which leads to:

  • Battery Condition, Care, & Storage: As you use your e-bike's battery, its effective range will diminish over time. This is again a consequence of the Li-ion technology that powers many of our devices today, including mobile phones, laptops, electric cars, and of course, e-bikes. Li-ion batteries traditionally experience a noticeable drop in total capacity after several years of continuous use, which isn't a concern for brand-new e-bikes, but it's something to keep in mind as your e-bike ages. The battery cells that make up an e-bike battery pack like to be kept between 20% and 80% charge, and keeping the battery in this range as best as you can will prolong the battery's total lifespan.

    However, if you ride frequently and/or if you ride long distances, charging to 100% is still more than safe. The Bafang battery that our bikes utilize will automatically stop charging at less than 4.2V per cell, greatly reducing the usual wear caused by fully charging the battery pack. Think of this feature as an extra level of battery capacity protection that prevents each individual cell in the battery pack from reaching its own max charge level. This means that in exchange for less than 5% of the pack's total range potential, you'll be able to retain more total battery capacity for longer compared to if the battery cells were allowed to reach their absolute maximum charge levels every time.

    This practice is already commonplace in the EV industry, and it's finding its way into the PEV (personal electric vehicle) industry in e-bikes, e-scooters, and many more e-things because of the huge increase in battery lifespan it provides. Traditionally, Li-ion batteries can lose up to ~20% capacity after several years of continuous use, but this technique of limiting the battery's max charge level aims to bring that percentage down considerably.

    Additionally, as mentioned above, if you'll be storing your bike without riding it for a long time (more than a month), it's best to remove the battery and keep it inside as opposed to in a garage or attic, where temperatures can fluctuate much more than what you'd see inside. If you're going to store your battery, try to charge (or discharge) it to as close to 50% charge as possible first, which is where the battery likes to sit if it won't be used for a while. Keeping the battery near 50% will minimize the degradation it undergoes during storage.
Your Safer electric bike choice

Fully UL2849 Certified

Geometry and Fit

Features

Hub Motor and Battery

Powered by a 48V 15Ah battery using LG high-capacity cells, Big Sur's 750W Bafang rear hub motor has the juice to take you just about anywhere.

Torque Sensor

One of the latest e-bike innovations, a torque sensor sees how hard you pedal in real time and matches your input power using the motor. This leads to a safer and more intuitive ride, as well as conserving battery life.

Full Color Backlit LCD Display

View essential stats at any time with a bright and daylight-ready full color screen. Choose between several different themes to see your speed, battery life, pedal assist level, and much more.

26” x 4” Fat Tire

Big Sur's puncture-resistant 26" x 4" tires can handle almost any terrain, giving you the confidence you need to push your own riding limits off-road.

Suspension Fork

With up to 80mm of travel and adjustable preload and lockout settings, our suspension fork eats up everything in your path, assisted by Big Sur's 4" wide tires.

Fender & Rear Rack

An MIK HD rear rack comes standard, allowing for endless customization possibilities. Plus, fenders come pre-installed to ensure you're protected from below while riding in any weather conditions.

Flat Position Welding

We've taken great care and utilized some of the newest aluminum welding techniques available on our frame, which comes with a lifetime warranty. These techniques allow the frame to maintain its structural rigidity while also appearing flat and smooth.

Walk Assist

Walk your bike alongside you, up a hill, or anywhere you need to with Walk Assist, which allows the bike to maintain a constant ~2-3mph based on your walking speed.

Controller Compartment

Big Sur's controller is mounted right near the pedals, allowing for easy access during repairs and maintenance. Plus, this mounting style allows the controller to utilize the entire frame as a heat sink, greatly improving safety and performance under load.

Video Gallery

Video Gallery

Assembly Guide

Our dealers follow this official assembly guide to make sure your bike is ready to ride.

Big Sur vs. Aventon

How does our bike stack up against the competition? Check out our head-to-head comparison.

Ride Review

Big Sur looks great in person, and even better in motion. See where it can take you!

Customer Reviews

Based on 55 reviews
93%
(51)
4%
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S
Steve Lagerstrom
Awesome bikes - better than Aventon!

My wife and I picked up two of the Big Sur ebikes last week and have been absolutely loving them! We have ridden for at least a couple hours every night after work and the smiles never leave our faces.

We were comparing with the Aventon Aventure 2 and feel like the Big Sur’s are more comfortable, equally powerful, look better (loves the tan sidewall tires) and the standard grips and saddle are much better from AIMA. The larger rear rack allowed us to put two large bags on the back that carry all the gear we need. They’re great bikes on or off road and turn heads everywhere we have been riding.

Only one small issue so far - the front fender has two support bars that attach to the wheel and one of the bolts on my bike worked loose and fell off so now the support bar and fender are flopping around. Have not been able to find any AIMA parts online so hopefully somebody from the company reads this and lets me know how we can get a new bolt!

Thank you for your fantastic feedback! We're happy to hear you and your wife are loving your Big Sur ebikes. For the front fender issue, please reach out to our customer service at info@aimausa.com. We’ll address your problem right away ☺️. Happy riding!

K
Karl
50 miles chain linkage catastrophe

Be careful changing gears up or down hills this thing almost left me stranded in a canyon after the gear linkage system rolled up like a cartoon.

Hi Karl, We are so sorry for your experience. If you accidentally touch the rear derailleur during your ride, it can lead to deformation of the rear derailleur lugs, making it more susceptible to breaking. However, our new e-bikes have been retrofitted with a rear derailleur protection bracket. If you need any kind of after-sales service, please contact your dealer. As a manufacturer, we provide the best after-sales support to our dealers.

S
Steven Hammersmith
test drive

First time test drove Big Sur. Very nice. Almost identical to Mokwheel except it has a weird ECO feature, have to pass 15mph to get into power mode. I did not see that on Big Sur. Will need to add a neck to bring the handle closer. I also need to know how it handle steep hills and what is the NM?

Hey Steven, thank you for sharing your experience! It's great to hear your positive impression of the Big Sur. Regarding adjusting the handle position, using an adjustable stem could be a helpful solution to bring the handle closer to you. When tackling steep hills, it's important to use low gears and high torque. For further assistance with this and other inquiries, reaching out to your dealer would be beneficial as they can provide professional advice and support. Also, the torque value of the Big Sur is 85NM.

S
Stephanie
Main mode of transportation

This bike has given our special needs son his independence back!! (We had the throttle disabled for safety reasons). He is a 6’4” large framed gentle giant who works 5 days a week and lives independently but does not drive. He loves the bike, feels it supports him well and we are so happy with the safety of this bike.

Our only issue is getting enough storage for him to get his groceries home. We have a large back rack and saddle bags but are in need of a front rack to fit the Big Sur 26. Could you please recommend a large front rack for this bike. Thanks!!

Hey Stephanie,Thank you for sharing how the Big Sur has empowered your son's independence—we're happy to hear it! In regards to your storage needs, we've got you covered. Our large front rack designed for the Big Sur 26 will be available in early June. Simply reach out to your dealer then for more details. Thank you for your support!

S
Scott Reynolds
New Big Sur Owner

I bought the 26” Big Sur for myself and bought my wife another brand e-bike and she’s already wanting to take mine away. For a large and heavy bike the Big Sur rides and shifts smoothly. We rode 20 miles this weekend and are looking forward to getting back out soon. I love the big seat, fat tires, and the speed of the bike is awesome. It’s possible that I trade my wife’s bike in for another Big Sur. Great job AIMA!

Hi Scott, it's wonderful to hear that you're loving your 26' Big Sur e-bike! Sounds like you had an amazing ride with your wife this weekend. The Big Sur's speed, big seat, and fat tires are all standout features that enhance the overall riding experience. It's exciting that you're considering another Big Sur for your wife—it's definitely a bike worth sharing the road with! Thanks for sharing your experience, and here's to many more enjoyable rides ahead!

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