Gear Ratio Questions

aaronmorg · #1 (**permalink**) 06-09-2009, 12:35 AM

I have come to the conclusion that instead of being stubborn and insisting on using an out-dated motor. I will purchase a kit.
Kit = Motorized Bicycle Engine Kits

But there is a small catch:

The only bike I would want to put this kit on has a 20-22" diameter. The kit is made for 24-26" Diameter.

How much trouble would it be to make the engine able to run on this smaller wheel size?

reg454 · #2 (**permalink**) 06-09-2009, 01:02 AM

You would just need to get a smaller sprocket like a 30 tooth should do. The kit comes with a 44tooth sprocket. thatsdax has a few sprockets you can also get custom ones from King's Sales & Service he is a sponser here his sprockets are nice they cost about $37.50 for the amount of teeth you need plus $12.50 for shipping in the US.

aaronmorg · #3 (**permalink**) 06-09-2009, 01:19 AM

Where would I look locally for the sprockets I would need?

Could I get them machined or could i buy them already made?

Pappy · #4 (**permalink**) 06-09-2009, 01:33 AM

You can use a stanard 32T sprocket and have the center hole bored then drill your mounting holes, I have a Schwinn OCC, I used the front sprocket on the rear.

aaronmorg · #5 (**permalink**) 06-09-2009, 01:43 AM

Sweet. Thank you

OCCstingray · #6 (**permalink**) 06-09-2009, 03:38 PM

If you use the front sproket on the rear, the 415 chain would not work with it because the front sproket is for a different size chain. The kit you are getting aaronmorg has the 415 chain.

HoughMade · #7 (**permalink**) 06-09-2009, 04:19 PM

Bicycle chain and 415 are both 1/2" pitch. The 415 will work fine with the bicycle sprocket; there will just be some extra side-to-side clearance.

matt167 · #8 (**permalink**) 06-09-2009, 08:17 PM

415 chain is actually designed for use on adult tricycles.. and the front sprocket would be the same as a normal bike, pretty sure anyway..

OCCstingray · #9 (**permalink**) 06-10-2009, 07:21 PM

Sorry about that, I thought they had a different pitch and the 415 chain would not line up with the bicyle sprocket. Good to know that it can work.