Electric bike conversion kit that recharges as you pedal?

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ChemTalk

Basically what's in the question just wondering if there are any electric bike conversion kits that will partially recharge while you pedal. Kind of like a hybrid; and if you guys have any could you point me to them?

Answer
no
recharge as you pedal?
that would be about .001% efficient

if you are going to pedal, why not let THAT run the bike
instead of pushing a generator, letting that charge a battery, letting the battery run a motor
all of which have losses

just charge from the wall for about 1 cent a day

there is no need to 'charge' from pedaling

wle.

is it ok to put a 21 speed bike wheel on a 24 speed bike to replace the tire?

yoyo2852

I need have 8 cogs on my rear wheel, can I use a different wheel that has 7 cogs? I would like to use this electric bike kit but it comes with the wheel being 7 speeds. Can I still shift all 7 speeds with this new wheel, just not the 8th, or will all the cogs be different sizes so I cant use the pedals at all?

Answer
It's a bit of a hack, and not something that's easy to just switch back and forth on.

7 and 8 speed both use the same size of chain, so you won't have any immediate problems just swapping the wheel. However, the distance between cogs is different, so your derailleur will not function correctly - it might jump two gears, it might not shift at all when you do, and it may throw your chain entirely. At a minimum, you'll need to adjust your limiter screws to keep it from throwing the chain, but ideally, you should be replacing the shifting mechanism.

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