Wisper Bikes

Wife and I have a pair of folding Wispers. Never ever got the battery half dead!
Gearing seems set for 15mph maximum and then your legs start windmilling like a cartoon.
Can the gearing be changed or will it affect the motor?
I think that was the same company that I bought some conversion kits off when deciding whether to take the eBike plunge or not?

Strong motors and batteries, I have coupled one to a Rohloff gearbox, it’ll get me up any hill. With a drop seat, I come to a dignified halt rather than falling over 🧐. I still use it. Blooming marvellous.
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