Search “derestrict e-bike” and you’ll find dongles, apps and firmware hacks, all promising the same thing: bin the 15.5mph cut-off and unlock the bike you actually paid for.
Most of the tech works. The legal side is where it gets expensive.
What derestriction does to your bike, legally
Nothing about the frame changes. Everything about the classification does.
GOV.UK sets out three ways your bike stops being an EAPC — an Electrically Assisted Pedal Cycle. It’s not an EAPC if it can be propelled at more than 15.5mph by the motor, if its continuous rated power output is higher than 250 watts, or if it doesn’t have pedals that can propel it.
Derestricting trips the first one instantly. Fitting a bigger motor trips the second.
And the moment you trip either, the law stops seeing a bicycle and starts seeing a motorcycle or moped.
The bill for that reclassification
Once it’s a motorcycle or moped, GOV.UK says the bike must be registered and taxed, you need a valid driving licence to ride it, you must wear a motorcycle helmet meeting British safety standards, and you must insure it.
Almost nobody who derestricts a hybrid commuter does any of this. Which means the typical derestricted rider is, in legal terms, riding an unregistered, untaxed, uninsured motor vehicle on a public road.
That’s not a technicality. Riding without insurance is one of the more serious things you can do on a UK road.
There’s a second sting too. GOV.UK is explicit that a non-EAPC cannot be ridden on cycle tracks or cycle lanes — only on the road. So derestriction doesn’t just add paperwork, it kicks you out of the protected infrastructure and into traffic.
What actually happens if police stop you
GOV.UK states plainly that if your bike is classed as a motorcycle or moped but hasn’t been insured, you may get a fine or your bike may be seized by police.
And the seizure process got a lot sharper this summer. Section 8 of the Crime and Policing Act 2026 repealed subsections 59(4) and (5) of the Police Reform Act 2002, removing the requirement for an officer to give a warning before seizing a vehicle used in a manner causing alarm, distress or annoyance. That change took effect on 29 June 2026.
Police can also test a bike at the roadside. If it assists past 15.5mph, that’s the whole conversation.
“But everyone does it”
Two things are true at once. Derestriction is common, and it’s still unlawful on public roads.
The realistic middle ground is private land with the landowner’s permission — that’s the same carve-out that applies to e-scooters. On a private track, none of the road-vehicle requirements bite.
The honest summary
Derestricting isn’t a crime in itself. Riding the result on a public road without registration, tax, insurance, a licence and a motorcycle helmet is where the trouble starts — and since June 2026, the warning that used to come first no longer has to.
If you want more than 15.5mph, buy a machine that’s legally built for it. It’ll cost less than losing a bike and picking up an insurance conviction.
Sources: GOV.UK — Riding an electric bike: the rules · GOV.UK — Circular 004/2026: Crime and Policing Act 2026 · legislation.gov.uk — Commencement Regulations 2026