rear gear -wheel

hi there. i have a bicycle and a motor from a minibike... now i want to make my first motorbicycle. i search the forum but did't find somthing to help me. i want to do pedal with my bicycle without working the motor. and when i want to put it on. my problem is the rear gear -wheel. if you don't understand what i want to say tell my to retype it. i'm sorry but i don't know good English..
thanks...

There is a very handy sprocket that bolts right to the rear wheel of a bicycle #41 or #415 (BMX) chain size.

Have a look at some of the advertisements at the sides of these web pages.

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