Safety & Regulations
E-bike tuning kit
What does E-bike tuning kit mean?
A device or software change that raises an e-bike's assist cut-off speed. On public roads it usually takes the bike out of e-bike law.
An e-bike tuning kit, sometimes sold as a derestriction or speed unlock, makes the motor keep helping above the legal cut-off speed. Some fool the speed sensor; others change the controller settings.
Why is it a problem?
The cut-off speed is what makes an e-bike a bicycle in law. In Great Britain, GOV.UK classes an e-bike that the motor can propel above 15.5 mph as a motorcycle or moped, needing approval, registration, insurance, a licence and a motorcycle helmet. In the EU, Regulation 168/2013 exempts pedelecs only when assistance stops before 25 km/h.
Drive makers also look for tuning. Bosch eBike Systems says its software detects tuning while riding and switches to an emergency mode with reduced support; after the third detection, only a dealer can clear it. Bosch also warns that tuning risks warranty claims.
If you want more motor speed, buy a bike approved for it. Our guide to making an e-bike faster legally and the fastest e-bikes guide show the legal routes.
Also known as: tuning kit, tuning kits, derestriction, derestricting, speed unlock
Related terms
- Assist cut-off speed The road speed at which an e-bike's motor must stop helping: 25 km/h (15.5 mph) in the UK and EU, 20 or 28 mph in the US.
- Electrically assisted pedal cycle The legal name for an e-bike in Great Britain: pedals that propel it, no more than 250 W continuous power, and no motor help above 15.5 mph.
- Speed pedelec An e-bike that assists up to 45 km/h (28 mph). In the EU it is a type-approved L1e-B moped, ridden with an AM licence under national moped rules.