Rad Power Bikes filed for Chapter 11 bankruptcy in December 2025. If you own one, the practical question is simple: when something breaks, where does the replacement come from now?
The brand itself did not disappear. Life Electric Vehicles bought Rad's assets out of bankruptcy, with the sale reported complete in early March 2026, and Rad Power Bikes is selling bikes again under the new owner. What has not come back, as of October 2026, is the electrical side of the parts catalog: Rad's official spare-parts store lists batteries, chargers, lights, tires and brake parts, but no controllers, displays, throttles, sensors, wiring harnesses or motors. Warranty terms under the new owner depend on when and where a bike was bought, so check Rad's current warranty page for your own purchase date rather than relying on a secondhand summary. Plan around what you can verify today.
Here is the honest version of what is replaceable and what is not.
Your bike is mostly standard parts — until it isn't
E-bike components interchange in three layers, and they get less forgiving as you go down.
Mechanical (dropout width, axle diameter, wheel size) is highly standardized. If the dimensions match, it bolts on.
Electrical (voltage, current, phase and hall wiring) is workable. Match the numbers, adapt the connector, and you are usually there.
Communication — the protocol between controller and display — is where most swaps die. KT, "No.2" UART, APT and proprietary CAN systems generally do not talk to each other.
That third layer is why a controller and display should be bought as a matched set rather than one at a time.
Which Rad models take aftermarket parts
This is model-specific, and it matters more than the year printed on the frame.
Verified plug-and-play: 2016–2018 RadRover and 2019–2021 RadRover (through Rover 5), using a KT 35A controller with an LCD8H display kit.
Needs modification: RadCity, older RadWagon, Runner, RadExpand 5 (cadence-sensor version only), Mission, Runner Two and Runner Plus.
Not compatible: Rover 6, RadWagon 5, and the newer 500-lumen headlight system.
One warning worth repeating: that 500-lumen headlight can destroy an aftermarket controller. Do not wire it in.
Bikes built from roughly 2021 onward are the harder case. Rad moved to controllers integrated into the frame, with battery bays and harnesses that are specific to those models. There is very little room for third-party parts there, and we would rather say so than sell you something that does not fit.
Three rules that catch people out
Same model number does not mean same protocol. An S866 display ships with different firmware builds — some speak 5S, some speak No.2, and only some let you switch with the P20 parameter.
Same brand does not mean compatible. Two parts from one factory can refuse to talk to each other when the firmware versions differ.
It plugs in and lights up is not the same as it works. A display can power on and still fail to read speed, change assist levels, or accept parameter changes.
Measure before you order
Wheel size alone is not enough. A 20-inch fat-tire wheel and a 20-inch narrow-tire wheel are different parts: the rim is more than twice as wide, and the dropout spacing differs by 35 to 55mm.
For fat-tire bikes in the 750W–1000W class, rear dropouts have converged on two standards — 170mm and 190mm — and they are not interchangeable. Some motors ship with spacer washers that bridge the difference, but not all of them do, and forcing the wrong one risks damaging the frame. Take the wheel out and measure the clear distance between the dropouts with a ruler or calipers.
Check that you have room, too. Aftermarket Rad controller kits run about 7.5 x 3.25 x 1.75 inches — larger than the original part, which on some frames means fabricating a bracket.
What we need to confirm a fit
Before you order, send us four things: a photo of your display face showing the model marking, a close-up of its connector (pin count, gender, wire colors), your measured dropout width, and your wheel and tire size.
Matching on model number plus connector is what makes a swap reliable. Motor wattage has nothing to do with whether a display fits — a display only shows information and passes your commands along, so the same unit can serve a 500W and a 750W bike.
If your model sits on the "needs modification" list above, tell us before ordering. We would rather walk you through what the job actually involves than have a box arrive that cannot go on.
For a fault a lot of Rad owners will recognize, see our guide to a motor that runs by itself.
RideRow is an independent parts retailer and is not affiliated with, endorsed by, or sponsored by Rad Power Bikes. Rad Power Bikes and model names are trademarks of their respective owners and are used here only to identify the bikes this guide covers.