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Motorized Cruiser Bicycles The beach cruiser has always been great bicycles to motorize. They just look good with a motor. Use this section to share and discuss about motorizing this classic.

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Old 09-06-2010, 06:31 PM
windbreaker1953 windbreaker1953 is offline
Motorized Bicycle Newbie
Join Date: Aug 2010
Location: florida
Posts: 1
Default bigger rear sprocket question

Bought a BGF kit a month or so ago and a Manic hub adapter that came with a 40T sprocket. The bike runs great and I have had it up to 35 mph and I think it would hit 40. And that is the problem.

You can't go 10-12 mph or it bucks and lugs. 16-18 is where it levels off and smooths out. I replaced the 40T with the Chinese 44T and it helped but still is choppy at low speeds.

A buddy has the same kit and his runs smooth at 10-12 and tops out around around 25-30.

My question is, are there different ratio gears between the crank and clutch shaft?

We ride a lot of campgrounds and dirt/rough roads, so its ok to trade off top speed for some low speed power range. I want to be able to cruise smoothly at 10-12 and still be able to go 20.

I am thinking of a bigger rear sprocket but still want to be able to go low 20's but don't want to keep buying sprockets.

I am thinking of a 54T rear.

Any help??

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Old 09-06-2010, 06:48 PM
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beentryin beentryin is offline
Motorized Bicycle Elite Member
Join Date: Apr 2010
Location: goshen,ohio
Posts: 208
Default Re: bigger rear sprocket question

my same problem im trying to talk myself into a shift kit.but the price wont let me do it
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Old 09-06-2010, 08:18 PM
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Venice Motor Bikes Venice Motor Bikes is offline
Custom Builder / Dealer/Los Angeles
Join Date: Mar 2008
Location: Los Angeles, CA.
Posts: 6,020
Default Re: bigger rear sprocket question

I think a 48t or 50t might be what you're looking for.
Check with Andy @ Kings sprockets... He has 'em all!
For motorized bicycle sales, service & engine kits in Los Angeles, please visit us at-

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