[rhiocrf230]

I have a 2007 250R Dropped the front tooth one size for trail bike type use also installed a recluse auto clutch. I need a little taller gearing for tight trails. What would be a good size rear sprocket. The current rear is stock. I need to reduce my first gear speed by about 30%. I do not want to go to large to interfere with the chain tensioner.

Any suggestions would be great.

Thanks....Rhio....

[crfsonly]

this is a perfect situation to use our gearing calculator. you'll be able to compare what you currently have with what you considering. it will show you the percentage change between the two:

http://crfsonly.com/howto/gearing/motor ... ulator.php

ken