There are 2 here, Maz's Dawes Geneva and my Kentex Trike both fitted (by me) with 250W front wheel kits (Cyclotricity)
Neither have any form of cadence or speed sensor fitted although both are capable of having an 'assist' controller fitted (they cost £50 for the basic one and £100 for the advanced type) There were a few reasons why I chose not to fit the assist.
- Cost- Didn't need to purchase the crank mounted sensor array or the handlebar mounted console
- Simplicity - Less to go wrong.
- Easier to fit - The crank needs to be removed to fit the sensor.
- Appearance - The handlebar mounted 'Assist Controller' is fugly
- Wiring - With Maz's set-up all the gubbins plug into the motor controller (mounted with the battery in the rack) with separate cables, a problem addressed by my slightly later set up which uses a single 'umbilical' cable that runs to the controller and that the other components plug into at the stem.
- Ease of use/range. There are occasions when I don't want to waste battery power and I don't want to have to mess around adjusting the 'assist' level on the handlebar unit, I just don't use the throttle.
Both are configured 'thumb throttle' only and the speed is governed by the motor/speed controller only running up to a certain number of revs (Whether this is due to the motor running to its maximum speed or the 3 phase 'Hall effect' converter in the controller being limited to a maximum frequency I don't know)
Neither could be built legally today but as they were built before the regulations in the UK were changed they're OK and if the regs change again they can both be 'retro-fitted' with the necessary bits, they just plug in to the existing system..
Reliability, something I was worried about but in 4yrs for Maz's bike and just over 3yrs for my Trike I haven't had to touch them.
