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Old 02-08-2009, 11:03 AM
5-7HEAVEN 5-7HEAVEN is offline
Motorized Bicycle Elite Member
Join Date: Aug 2008
Posts: 1,912
Default Smaller Sprocket For Single-Speed Bikes

On "The Whizzard's" maiden voyage yesterday, I rode to my jobsite and back, then motored west to Home Depot for stuff, a distance of 25 miles. The bike performed flawlessly; this surprised me cuz I rescued it eight days ago from months of neglect in an open bike lot. Changed oil and crumbling fuel lines, tightened stem, added air and awayyy she went!:grin5:

Brakes need attention but that's another post.

My question is if it's possible to change to a smaller sprocket on single-speed bikes. This Whizzer is freewheeling; it has a small drum brake, not a coaster brake.

However, I'd also like to swap to a smaller sprocket on "The Dragon Lady", my twin-engined cruiser with coaster brake.

The reason is that both bikes need my pedal-assist during midrange and top speed. My other dual-engined monster "The Iron Dragon" has five speeds and fifth gear REALLY helps pull the bike, even at speeds over 30mph

What should I look at changing, the freewheel sprocket or the crankset?

IMO, adding more pedal-assist to a Whizzer bike or a motorized coaster bike would definitely enhance both bike's midrange and top end performance.

Of course low speed pedalling would suck without the engine , but I can live with that.
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