RadRunner 1000W Motor Wheel Upgrade
This motor wheel is built for two things: to give better longevity and durability to the RadRunner platform, and to allow running higher-amp controllers for better torque and higher top speed.
We saw a major issue with the RadRunners coming through our shop — dozens of stock RadRunner motors were coming in with stripped gears and melted windings.
We offer a 1000W-capable geared hub motor, specifically designed around the RadRunner 1 and 2 and compatible with the RadRunner 2025. These bikes have a non-standard 168mm rear dropout that makes finding a compatible wheel next to impossible. This motor is a drop-in replacement that offers much better reliability and can sustain higher peak power for longer.
Choose your wind: torque or speed
This motor comes in two winds — pick the one that matches how you ride using the option above:
- Slow wind (torque): More winding turns for stronger low-end torque and better hill climbing — the pick for cargo, heavier riders, and steep grades. Trades a little top-end speed for grunt.
- High wind (speed): Fewer turns for higher top speed. This wind is built to run with an aftermarket controller — it has the same top speed as stock, but paired with our 35A aftermarket controller (and a matching battery) it unlocks real top-end speed. Best for mostly-flat riding.
Same tough 1000W build either way — the wind just sets the motor's character. Not sure which fits your riding? Ask us and we'll point you to the right one.
Specifications
| Motor | 48V 1000W geared hub |
| Axle width (O.L.D.) | 168mm — fits RadRunner 1 & 2 |
| Connector | Z916 (Julet) — direct plug-in to stock RadRunner harness |
| Wheel size | 20" |
| Tire size | 20×3.0–4.5" |
| Freewheel | Threaded screw freewheel |
| Rim | 65mm internal width, black |
| Spokes | Black |
| Motor cable | 250mm |
| Warranty | 1 year |
What's Included
- 1000W pre-built motor wheel, ready to install
- Threaded freewheel included
- Free shipping to the contiguous US
Compatibility
Fits: Rad Power Bikes RadRunner 1, RadRunner 2
Installation
This is a rear wheel swap. If you're comfortable changing a bike wheel and routing a motor cable, you can do this yourself in about 30 minutes. A basic bike toolkit is all you need — no specialized e-bike tools required.
Not comfortable doing it yourself? Any local bike shop can install this. We're also happy to answer install questions via email, or book an install at our Santa Cruz shop.
FAQ
Will this work on my RadRunner?
This wheel is built for the RadRunner 1 and RadRunner 2. It uses the 168mm rear dropout spacing specific to those models. Not compatible with the RadRunner+, RadRunner LT, RadRunner Plus, or other Rad models. Send us your serial number if you're unsure.
Do I need a new battery, controller, or display?
No — it's a direct replacement that runs on your stock RadRunner battery, controller, and display as-is. The upgrade you get right away is durability: this motor is built tougher than the stock unit to take harder use and last longer.
It's also higher-rated, which means it has room to grow. A motor doesn't draw power on its own — your controller decides how much current it pulls — so paired with an aftermarket controller (and a battery to match), it can deliver more power and higher speed than stock. Stock setup: a stronger, longer-lasting replacement. With an aftermarket controller: the foundation for a faster build.
What about speed and power?
On your stock controller, speed and power stay the same — the controller governs both. The reason to run this motor is headroom: it's rated to handle an aftermarket controller, and that's where the extra power and higher speed come from.
Worth knowing: a setup that goes past 750W or 20 mph is no longer a Class 2 e-bike and may not be street-legal as one where you ride. Many of these builds are used off-road or on private property — check your local laws before pushing past stock.
Does this void my Rad Power Bikes warranty?
Yes, modifying the motor will void the Rad warranty on the drivetrain (motor, controller, related electronics). Your frame, battery, brakes, and other unmodified components remain under their original warranty terms with Rad. The wheel itself comes with a 1-year warranty from Temper.
Can I install this myself?
Yes, if you're comfortable changing a rear wheel and routing a cable. The motor cable plugs directly into your stock RadRunner harness via the Z916 connector — no splicing, no soldering. Plan on 30 minutes for someone comfortable with basic bike work. Watch a YouTube video of a RadRunner rear wheel removal first if you've never done it.
What tools do I need?
An 18mm wrench to remove the axle nuts, a 4mm hex for the torque arm, and a T25 for the rotor swap.
Is it street-legal?
The wheel itself doesn't change your bike's classification. Your RadRunner is still Class 2 (20 mph throttle limit) because the controller governs speed, not the motor. You're legally riding the same e-bike class — just with more usable power under the speed limit.
How long is the warranty?
1 year from purchase date. Covers manufacturing defects on the motor and wheel build. Doesn't cover damage from collisions, water intrusion past IP rating, or improper installation.