smaller sprocket on rear wheel

yes,,,
the smaller you go, more top end (speed), less bottom end (torque)

keep in mind, you may need to pedal more to take off from a stop :)
 
Correct... although there is some discussions on how small you can go. I currently use a 28T sprocket (mainly for clearence issues). My tops speeds are around 37-39MPH.

I have used a 36T with excellent all around results.

These engines can only pull so much!! I've used a 25T but it was just too hard on the clutch.
 
a lot of it depends on weight (yours and the bike's.) if you're 135lbs like me, and you're motor has a lot of torque (like mine) you can get away with a lot smaller sprocket than a guy who's 200+ with a stock motor.

eventually, a heavier guy can get to (almost) the same speed, but it just takes longer to build up the momentum.

i run a 30t, and it works great for everything, hills, etc.

ideally, you'd want a balance of speed and torque, and to do that, you'd have to experiment with different sprocket sizes, which means spending more money and time.
 
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