Conversion in theory is straightforward but the problem is that a conventional bicycle was never meant to be ridden with a motor and battery that add additional weight (most bike have a max combine weight of 120kg).
Brompton for example specifically said never to fit a Swytch system on their bicycles as the fork isn’t designed to be ridden with a motors, their electric model is very different than their standard model.
Warranty is a big factor as well as it’s being a direct to consumer manufacturers mean a lots of shop/reseller can’t touch it as they don’t know the system and can’t access it (mechanic do need to be trained in certain system before undertaking a services on an electric bike, if they don’t know the system, it can cause liability to the shop).
Liability from aftermarket another big factor as they can be overridden and go over the max speed limit/no assist etc. which then turn it into a speed pedelec which requires insurance, driving license, registration, correct helmet (moped type) etc.
It’s a minefield and it’s always recommended to go for a normal ebikes that you can get, unless you only ever service your own bike and happy to lose the warranty of your frames.
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