Geeko-Rear: A Cyclist’s Dream Come True! Whether for daily urban rides, epic long-distance treks, or tough mountain biking, it’s your perfect companion.
Fits any bike, be it 135/130MM quick-release or 148/142MM thru-axles. You can pick 250W, 350W, or 500W motors and match with 5.2-20AH batteries.
Smart drivetrain with a patented sensor tracks cadence and gears in real-time. High-efficiency motor provides adaptive power.
The 3-in-1 battery/controller/display, in a water-bottle shape, keeps your bike sleek. Modular design ensures mechanical performance, IP67 waterproofing, and data-based power management for reliable rides in all conditions.
Geeko Rear Motor
Lightweight & High-Torque: 2.8KG, 4.33 gear ratio, 40NM (350W) torque—quiet, durable power for tough rides.
Clutch-Enabled Free Pedaling: Built-in clutch eliminates magnetic resistance—pedal smoothly even when the battery runs out, just like a regular bike.
True 135MM Compatibility: 138MM dropout (250W/350W, 7-10S motor) truly fits standard 135MM frames—rivals claim 135MM but use 144MM.
Universal Frame Compatibility: Works with quick-release axles (135/130MM) and thru-axles (148/142MM)—fits most bike frames.
Default Droupout & Slot Width
Customization Options
- Dropout: Quick release axle, 133MM(7-10S cassette)/135MM(11-12S cassette), for rim brake road bike
- Dropout: Thru axle, 148MM & 142MM
- Slot width: 10MM/9MM
If your bike has a thru-axle, simply click the button below to order effortlessly!
- Double-wall aluminum rim: Precision-machined
- High-strength PVC tire pads: Withstand a maximum of 100 psi tire pressure
- Radial/axial deviation: < 0.5-1 mm
- 13G (2.2 mm) high-tensile steel spokes
- 36-spoke configuration: Optimized for e-bike torque loads
- Spoke tension: 25-30 kgf
- Wheel size compatibility: 16-29 inches (650b/700c/29er)
Default Specifications
Customization Options
- Pure black disc brake rim
- Silver rim
- Silver spokes
- Silver motor housing
Patented Cassette Sensor
The cassette sensor is integrated into the motor, eliminating the need for a bottom bracket cadence sensor(Such sensors are prone to failure).
The smart cassette sensor accurately captures real-time variations in pedal cadence and gear ratio. Combined with 100G’s proprietary, well-matched bionic power-assist algorithm, it enables real-time, precise motor control for a highly natural and seamless power delivery(The cadence sensor has no way to detect the gear ratio).
Bionic torque power, an electric power distribution and control system independently developed by 100G, closely approximates traditional torque-assist systems by offering cyclists a human-like, fluid riding experience that significantly enhances comfort and efficiency.
- Linear, natural assist power ideal for multi-gear bikes
- Each level achieves maximum speed
- Levels differ by motor boost power (vs. speed in other systems)
- Independent max speed/current settings per level
- Auto uphill enhancement increases power on inclines
- 50% longer range: 130km (10Ah) / 200km (15Ah)
Geeko Bottle
6 Bottles x 4 Colors
Intelligent Display
Featuring a bottle cap-integrated design with built-in Bluetooth 5.0, this display combines a 3-button interface and 1.25-inch digital screen for classic electric bicycle HMI, offering IPX7 waterproof protection (full battery bottle immersion resistance) and low-power operation (standby current ≤12mA).
Real-Time Monitoring
- Battery level (1% precision)
- Assist level
- Controller connectivity (plug-and-play supported)
- APP Bluetooth status (OTA updates enabled)
- Flashing error code for fault Diagnosis
Operation Controls
- Power On/Off
- 0-5 assist level adjustment
- Parameter settings (Includes 18 functions like wheel diameter calibration/speed limit reset)
APP
The 100G/Geeko app features an intuitive interface for better interaction, with no setup required and simple +/- button controls that make it easy for everyone to use. Key functions include:
- Monitor speed, battery level, and ride stats in real time
- Adjust assist levels (0-5) and modify settings
- Fault diagnosis
- OTA firmware updates
Controller
The controller is enclosed in an aluminum housing with integrated heat dissipation fins at the bracket base, ensuring efficient heat dissipation. Adaptive thermal management reduces power output incrementally under high-temperature conditions to prevent overheating.
- Overheat Protection: Maintains safe operating temperatures for long-term performance
- IPX7 Waterproofing: Fully potted with thermally conductive epoxy for submersible protection (1m depth, 30-minute immersion)
- All-Weather Operation: Ensures reliable functionality in rain, mud, or extreme humidity
Modular Expansion:
Supports plug-and-play expansion, allowing users to customize their e-bike with:
- Front/rear light
- Handlebar display
- USB Charging
- Throttle/Brake lever
Modular Expansions
The Geeko system comes with practical plug-and-play expansion accessories. Even if you’re installing them on your own, you can do it with ease.
Accessories You May Need
Introduction Videos
Geeko-Rear Introduction
Geeko-Rear Unboxing
Geeko-Rear Installation
Geeko-Rear Operation
Independent Reviews
EMOBILIST--In 60Minuten vom BIO- zum EBIKE mit dem 100G Geeko Umbausatz
Paul's Views & Reviews--Swytch vs. 100G - which is the best e-bike conversion kit?
MobiliTest--100g tech , Un Kit pour electrifier son vélo VRAIMENT à la portée de TOUS ! (TUTO)
Zero Pionier--vom Fahrrad zum eBike : 100G.tech Geeko Umbausatz "REAR" / no Pendix & Bafang
"Geeko" Anywhere on Your Bike
With 4 types of Geeko Adapters, you can fix Geeko Bottle anywhere on your bike.
Specifications & Manuals
Policies
Campaign & Rewards
Show Geeko, Get $50 Rewards
- Every Geeko user is warmly invited to participate in our campaign.
- Show your objective and unbiased videos about Geeko.
- Easy job for everyone.
EU Warehouse & Accessories Pre-installation
Your order may include Geeko kit (Geeko-Front/Rear/Dual) and other accessories(cassette, brake disc, light, light cable, additional throttle, etc.).
If Geeko kit in your order is in EU warehouse:
- Geeko kit in your order will be shipped in 2 parcels from EU warehouse, shipping time 3-7 days.(One parcel with battery and bracket controller, the other parcel the rest of the Geeko kit).
- Other accessories in your order will be shipped separately in 1 parcel from China factory by air, shipping time 8-12 days.
Note that in this case you will need to install some accessories yourself. Don’t worry, the installation of the accessories is very simple, please follow instructions below.
If Geeko kit in your order is NOT in EU warehouse:
- Your order will be shipped in one parcel from China factory, and the accessories will come pre-installed. Normally shipping time 25-30 days.
imreoliver.kozak (verified owner) –
After 1 year or fuse: in general it works well. The first impression was nice, and with relatively small amount of fiddling it was possible to install.
It is relatively silent, and the 38 Nm and 250W is sufficient for small riders.
However, there are many quirks and quality issues in long term use.
The front lamp was not possible to fasten with the screw, I had to add a zip-tie.
During the first rain, water leaked into under the display, so we have to remember to cover it with a plastic bag in rain.
The battery is not so easy to put on and off. The battery anyway is very key is fiddly, and is NOT optional. If you don’t close it with the key, the battery is not held in place. Once, the battery was not well secured with the key, and it fell off during the ride. The small plastic holder broke off from the battery, and now I looked for some velcro to keep it in place.
if you pedal backwards it still pushes forward.
The display had no user manual, and took me a full day to find out how to switch on the light, or reset the counter to zero.
The battery % indicator is useless, it keeps showing 90% charge after an hour of riding, then shows 50-60% and then 5 minutes later drops to zero.
When I take off the battery, and forgot to put back on the plastic cap, the connectors get wet if it rains during the day.
Warranty: I had to make pictures and videos of everything, then they charge $20 time for shipping there is an issue. Later on I didn’t even bother.
Remember, it has only cadence sensor, so cannot sense how strong you pedal, only how fast.
All in all, kinda works, but I don’t think I would buy it again.
Christian Seidl (verified owner) –
Hello,
Today arrived the complete kit for my bicycle and runs very good!
Thank you for the helpness about ist my purchase order.
Matthew Smith (verified owner) –
Hello 100g team,
I’m currently a customer of your hub motor kits, which I think are excellent, and I’m considering the setup for my next bike
Esther (verified owner) –
It’s a godsend for seniors like me who need a little help, especially when going uphill. It makes cycling fun for me again. Equally surprising is that riding outdoors is the motor is barely audible.
Highly recommended kit.
Gary Sheppard (verified owner) –
The kit is installed and I’ve heard great things about the Geeko kit. I can’t wait to try it out! If it performs well, I will recommend it to my friends. I know a lot of people are waiting for my recommendation
Alberto (verified owner) –
I really like your 100g-tech Geeko kit.
The throttle really helps: we have a lot of hills here, so I use the throttle when I’m I’m going uphill and it’s totally effortless, just perfect.
Thierry Le Cornec (verified owner) –
Order received.
I fitted the kit to my bike and all is well.
Delivery took a long time but I don’t regret my purchase.
Great job by the team.
Keep up the good work.
Bartolomeo (verified owner) –
Kit received, although longer than I expected to receive, but open the box, the inside emissions neatly, open the box in the accessories is very delicate, no cheap feeling, an hour and a half to install the end, looks like the same as the ordinary bike, I will come back to give a comment after the test ride.