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Geared hubs have a high RPM motor
inside with a planetary transmission
linking it to the low speed of the bike
wheel. They also have a built-in
freewheel that disengages the motor
so that the wheel spins freely with no
drag when not in use. Together these
make for a lighter hub motor and a
ride experience that is closer to a
normal bike, but because of the
freewheel they cannot do
regenerative braking.
Torque Sensing/Proportional Assist:
Most of our bike conversions are by default set up with a throttle input that controls the
speed of the motor. However it is possible to have an assist setup, where the harder you
pedal, the more motor assistance you receive. This has the advantage of removing the
need to worry about engaging the throttle the whole time but also removes some of the
control you have over the power delivery.
Waterproofing:
We spec and design our components with
waterproofing in mind, and nearly all our own
products cope well in rainy conditions. We
endeavor to make the third party products
we sell as waterproof as possible but some
of them might get damaged from prolonged
exposure to the elements. Water entry does
occur in hub motors from time to time and it's
generally advised to try and store the bike
out of the rain if you can.
Freewheels:
All the rear motors we sell at Grin are able
to accept a standard bicycle freewheel
(though not a cassette hub which is different) and these are normally available from a
bike store but usually with a limited selection. Alternatively we have a range of
freewheels with 11 teeth on the smallest sprocket and this allows you to keep pedaling
with the ebike even as it gets up to a higher speed from the motor power.
