Joshm1991 Posted May 24, 2012 Report Share Posted May 24, 2012 Hey peeps!! I'm building up a new 26 inch dirt jumps bike and I'm a little skeptical about the gearing.. I'm looking at possibly a 25 tooth front sprocket but I dunno what to go for on the back?? I had the idea of putting my 22 tooth front sprocket from my phase onto it but the BB was too short and it was fowling the chainstay.. I'm going to buy some 3 piece cranks from CRC but again, buying the sprocket to with it is where I'm stuck!! Cheers in advance guys!! Joosh Quote Link to comment Share on other sites More sharing options...
bike_dummie Posted May 24, 2012 Report Share Posted May 24, 2012 Quote Link to comment Share on other sites More sharing options...
Joshm1991 Posted May 24, 2012 Author Report Share Posted May 24, 2012 Ahh okay!! So how this work then?? Is this just for rear sprockets or for both?? Sorry my understanding of maths is terrible!! Cheers Joosh Quote Link to comment Share on other sites More sharing options...
bike_dummie Posted May 24, 2012 Report Share Posted May 24, 2012 If your gonna use a 25tooth chain ring on the front you will want a 12tooth sprocket/driver Quote Link to comment Share on other sites More sharing options...
Joshm1991 Posted May 24, 2012 Author Report Share Posted May 24, 2012 Ahh I've got you now!! I was looking at the formula bit on the bottom and thinking what the hell is this!! nice one!! Thanks very much guys!! That's made my life a bit easier!! Think I'll save that pic so I know what I'm doing if I change the front size!! Thanks again!! Joosh Quote Link to comment Share on other sites More sharing options...
bike_dummie Posted May 24, 2012 Report Share Posted May 24, 2012 (edited) No problem mate Edited May 24, 2012 by bike_dummie Quote Link to comment Share on other sites More sharing options...
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