Hello,

If I know the distance from the centre of the BB axle to the centre of the rear hub axle and the length of one chain link is there a formula I can use to calculate which chainring/sprocket combos will be a ‘magic ratio’?
Do I need a different formula if I use a half-link?

Cheers,
Andy

There is a website somwhere that will tell you what magic ratio you can run but I can’t for the life of me remember its name

thepodge – Member

There is a website somwhere that will tell you what magic ratio you can run but I can’t for the life of me remember its name

This one?

http://www.eehouse.org/fixin/formfmu.php

magic ratio is a myth it is not a long-term solution. get a tensioner.

That’s the one

That will do nicely, thanks very much.
STWoogle beats google yet again.