geeko-dual-installation
Geeko-Dual USD1,075.00 USD2,073.00Price range: USD1,075.00 through USD2,073.00
Back to products
Cassette Sensor
Spare Geeko Sensor USD16.00 USD26.00Price range: USD16.00 through USD26.00

Geeko-Rear

(160 customer reviews)

USD557.00 USD1,060.00Price range: USD557.00 through USD1,060.00

SKU: Geeko-Rear Category: Tag:
Description

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

Motor
  • Lightweight & High-Torque: 2.8KG, 4.33 gear ratio, 40NM (350W) torque—quiet, durable power for tough rides.

  • Shimano HG Freehub: Excellent compatibility for 11-speed and lower cassettes. For 12-speed systems: Shimano MS or SRAM XD cassettes require replacement with a Shimano HG cassette.
  • 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
  • Dropout: Quick release axle, 138MM(7-10S cassette)/140MM(11-12S cassette)
  • Slot width: 10MM
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
  • Matte black rim with polished silver sidewalls (rim/disc brake compatible)
  • Black spokes
  • Black motor housing
Customization Options
  • Pure black disc brake rim
  • Silver rim
  • Silver spokes
  • Silver motor housing
Geeko-Rear Wheel
Geeko-Motor
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)
Bionic Torque Power

Geeko Bottle

6 Bottles x 4 Colors

Geeko Bottle Family - short bottle-800x600
Geeko Bottle Family - tall bottle
Bottle Bracket-new
Geeko Bottle Battery
Intelligent display

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
100G APP
Controller

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 installation

Geeko-Rear Introduction

geeko rear unboxing

Geeko-Rear Unboxing

geeko rear install

Geeko-Rear Installation

geeko rear operation

Geeko-Rear Operation

Independent Reviews

emobilist
rating star 1

EMOBILIST--In 60Minuten vom BIO- zum EBIKE mit dem 100G Geeko Umbausatz

Paul
rating star 1

Paul's Views & Reviews--Swytch vs. 100G - which is the best e-bike conversion kit?

MobiliTest
rating star 1

MobiliTest--100g tech , Un Kit pour electrifier son vélo VRAIMENT à la portée de TOUS ! (TUTO)

Zero Pionier
rating star 1

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

Specifications

Specifications for every items

Geeko Kit Manual

Packing list / Installations / Error code

APP Manual

Wheel size / Speed limit, etc.

Policies

Shipping

Shipping time / Shipping cost

/ Order tracking / VAT & Customs

Warranty & Return

Warranty / 7-day return policy

/ Damages and issues, etc. 

FAQ

Installation / Warehouse

/ Dealers/ MOQ, etc. 

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.
Will Geeko fit my bike

EU Warehouse & Accessories Pre-installation

warehouse

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.
Specifications

Geeko-Rear Kits

Geeko Model Motor Power Battery Case Battery Capacity Battery Cell Charger Mileage(km)* Thumb Throttle
Mini-25052R/RT 36V250W Mini 36V5.2AH DMeg 42V2A 20-60 N/A
Mini-25070R/RT 36V250W Mini 36V7.0AH LG/Samsung 42V2A 28-85 N/A
Mini-35070R/RT 36V350W Mini 36V7.0AH LG/Samsung 42V2A 28-85 Yes
 Prime-25078R/RT 36V250W Prime 36V7.8AH DMeg 42V3A 32-95 N/A
 Prime-35078R/RT 36V350W Prime 36V7.8AH DMeg 42V3A 32-95 Yes
 Prime-25100R/RT 36V250W Prime 36V10.0AH LG/Samsung 42V3A 40-130 N/A
 Prime-35100R/RT 36V350W Prime 36V10.0AH LG/Samsung 42V3A 40-130 Yes
Solid-25100R/RT 36V250W Solid 36V10.0AH LG/Samsung 42V3A 40-130 N/A
Solid-35100R/RT 36V350W Solid 36V10.0AH LG/Samsung 42V3A 40-130 Yes
 Max-25150R/RT 36V250W Max 36V15.0AH LG/Samsung 42V3A 60-200 N/A
 Max-35150R/RT 36V350W Max 36V15.0AH LG/Samsung 42V3A 60-200 Yes
 Max-50100R 48V500W Max 48V10.0AH LG/Samsung 54.6V3A 40-130 Yes
Pro-25150R/RT 36V250W Pro 36V15.0AH LG/Samsung 42V3A 60-200 N/A
Pro-35150R/RT 36V350W Pro 36V15.0AH LG/Samsung 42V3A 60-200 Yes
Pro-50100R 48V500W Pro 48V10.0AH LG/Samsung 54.6V3A 40-130 Yes
Ultra-25200R /RT 36V250W Ultra 36V20.0AH LG/Samsung 42V3A 80-260 N/A
 Ultra-35200R/RT 36V350W Ultra 36V20.0AH LG/Samsung 42V3A 80-260 Yes
Ultra-50150R 48V500W Ultra 48V15.0AH LG/Samsung 54.6V3A 60-200 Yes
*Regarding the max. mileage, it is obtained under the following ideal conditions: flat road, no wind, 30 degrees Celsius, the rider’s weight is 60KG, the actual mileage will vary due to different conditions

Geeko Rear Motors

Geeko Rear Motor
Motor Model MT-3625R MT-3625RT MT-3635R MT-3635RT MT-4850R
Bike Fork Quick Release Thru Axle Quick Release Thru Axle Quick Release
Power 250W 250W 350W 350W 500W
Rated Voltage(V) 36 48
RPM 290 290 350 350 450
Contruction Gear Drive
Gear Ratio 4.33
Torque(NM) 38 38 40 40 48
Weight 2.6 3.6
Diameter(mm) 132 150
Efficiency(%) >80%
Cable & Connector 10 pins waterproof connector
PAS Sensor Built-In Cassette Sensor
Cassette Default version: 7-10S
Special version: 11-12S
Spoke Holes 36
Brake Disc brake or V brake
Dropout Size/OLD (mm) 7-10S Cassette Default: 138 142/148 Default: 138 142/148 144
Custom: 133 Custom: 133
11-12S Cassette Default: 140 Default: 140 146
Custom: 135 Custom: 135
Waterproof IP65
Certificates CE
Max. Speed (KM/H) 305-16″ 18-20 18-20 22-24 22-24 28-31
355-18″ 20-22 20-22 24-26 24-26 32-35
406-20″ 22-24 22-24 27-30 27-30 35-38
559-26″ 29-32 29-32 35-40 35-40 45-49
584-27.5″ 31-34 31-34 37-42 37-42 48-53
622-28“/29er-700C 32-35 32-35 39-44 39-44 50-55
*Regarding the maximum speed of the motor, it will fluctuate within a certain range as it is directly affected by battery power and load. The above range values are for reference only. A higher battery power or a smaller load will result in a higher maximum speed; conversely, a lower battery power or a larger load will lead to a lower maximum speed.

Geeko Bottles

Geeko Batteries

Model Bottle Case Capacity Height(mm) Diameter(mm) Weight(kg) Cell Type Cell Brand
GB-36052-Mini-B3 Mini 36V 5.2AH 222.5 76 1.25 18650 DMEG
GB-36070-Mini-B3 Mini 36V 7.0AH 222.5 76 1.3 18650 LG/Samsung
GB-36100-Solid-B3 Solid 36V 10.0AH 222.5 87 1.75 21700 LG/Samsung
GB-36150-Pro-B3 Pro 36V 15.0AH 222.5 104 2.55 21700 LG/Samsung
GB-48100-Pro-B3 Pro 48V 10.0AH 222.5 104 2.3 21700 LG/Samsung
GB-36078-Prime-B3 Prime 36V 7.8AH 292.5 76 1.8 18650 DMEG
GB-36100-Prime-B3 Prime 36V 10.0AH 292.5 76 1.8 21700 LG/Samsung
GB-36150-Max-B3 Max 36V 15.0AH 292.5 87 2.55 21700 LG/Samsung
GB-48100-Max-B3 Max 48V 10.0AH 292.5 87 2.3 21700 LG/Samsung
GB-36200-Ultra-B3 Ultra 36V 20.0AH 292.5 104 3.65 21700 LG/Samsung
GB-48150-Ultra-B3 Ultra 48V 15.0AH 292.5 104 3.55 21700 LG/Samsung

Thumb Throttle(For 350W and 500W kit)

Items Weight

Items Weight(KG)
Battery Mini 1.3
Solid 1.75
Prime 1.8
Max 2.55
Motor Wheel 250W 2.6
350W 2.6
500W 3.5
Controller 0.5
Charger 2A 0.42
3A 0.75
Thumb Throttle 0.1
Phone Holder 0.2

Package

Wheel Package Size(CM) Package Weight(KG)
20″ 50X50X25 9
26″ 60X60X25 9
27.5″ 60X60X25 9
28″ / 29er /700C 64X64X25 9

Warranty

Warranty

Items Motor Controller Charger Battery Phone Holder
Warranty (Months) 24 24 24 12 3

After-Sale Service

  1. Our goal is customer satisfaction!
  2. After you received the goods, if you do not know how to use it, please feel freely to contact us, we will try our best to deal with all problems.
  3. During the warranty period, if product parts have problem (like motor, controller, battery, charger, etc.), we will provide new parts for free(You need to provide strong evidence that shows these parts have been damaged), you only need to bear the freight. At the same time, we also can provide free technology consulting.
  4. Within 5 days after you received the goods, if you find there are problem with goods, please contact us.

Local Dealer & Service

We have distributors in some countries or regions, so that you can receive our products faster and provide more timely and accurate after-sales service. Please contact us and we will recommend a suitable distributor to you.

 

Reviews (160)

160 reviews for Geeko-Rear

  1. Ilpo Pöllänen (verified owner)

    Asensin sarjan viime keväänä. Tosi tyytyväinen sarjan laatuun. Kaikki työkalutkin mukana.
    Avustus tulee pehmeästi ja tasaisesti mukaan. Moottori lähes äänetön.
    Valitettavasti pyöräni varastettiin viikon päästä siitä, kun sain sarjan asennettua!
    Lyhyeksi jäi ajokokemus sarjasta. Harmi!

  2. Martin Kaczmarczyk (verified owner)

    The first motor was unfortunately defective. I noticed a strange noise coming from the rear motor. Still, I would give the customer service at Geeko 7 out of 5 stars! They guided me through several troubleshooting steps, but nothing worked… the noise persisted.

    After a lot of back and forth, they offered me a replacement motor for $40. I had to transfer the new motor into the old tire, which was a bit annoying, but I managed it. Since then, I’ve been riding my bike to work every day, and I have no complaints!

    I’ve done about 500 km with the new motor so far, and both the motor and battery are still performing excellently. I’m very thankful for the great support from Geeko. The new motor is fantastic —> 5 out of 5 stars!

  3. 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.

  4. 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.

  5. 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

  6. 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.

  7. 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

  8. 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.

  9. 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.

  10. 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.

Only logged in customers who have purchased this product may leave a review.