Hi All

I re-built my Cheetah trials bike (37A Villiers motor) a few years ago, but have only now started to use it in classic trials. The bike was put together with whatever came in the boxes and everything fitted as it should. Today, I found the bike was definitely "overgeared". I have established that the final gearing on the bike now, is 15T/54T.

Does anyone have an idea what it should be?

Thanks in advance

David

Hi David,

This thread is a good starting point:

http://www.trialscen...s-engined-bike/

Edited October 20, 201312 yr by norman_wisdom

Hi David, if your engine as standard gearing (20t primary sprocket)this is what i would suggest.13t front and 60t rear,this is good starting point.Most 32a and 37a engines go ok with this.

All the best Anvil

Ok, I'll check the engine sprocket, then I'll get a 13/60 final drive sprocket combination made up.

Regards

David

I have taken a look at a spare villiers front sprocket from the Cheetah spares. This one is an 18 tooth - part number E9149/1. If I have to replicate this with only 13 teeth the raised centre boss at the rear of the sprocket looks like it will be too large to clear the chain.

Does anyone have details of a 13 tooth sprocket for me?

Thanks

David