BadassBox 5 Tuning Kit for Bosch Rim Magnet eBikes - Gen4 CX

Built specifically for Bosch Gen4 CX eBikes with a Rim Magnet sensor (mounted on the rear wheel valve). This tuning kit removes the 15mph or 20mph factory speed limit, giving you the freedom to ride faster, further, and without restriction. DIY Install. No motor removal. Installation is completely non-invasive — simply clip the box to your bike's frame and attach the coil to the motor. No need to remove the motor or touch any of your bike’s internals. Download Instructions here (PDF) You can also connect it to your smartphone via the free Boost Buddy app (available on iOS & Android) for enhanced control and data visibility. Important to know: As this tuning kit works externally, your eBike’s onboard display won’t show accurate speed or distance once installed. When riding above the speed limit, your bike will continue recording distance at a fixed 23–24 km/h (15mph) for consistency. ⚠️ For off-road use only. Not legal on public roads. Read full legal disclaimer.