Monty Man Sam Posted August 4, 2007 Report Share Posted August 4, 2007 How do you work out the size of your B.B when buying a new one? On normal Mtb's you just measure across the b.b shell and it's either 68 mm or 73mm but this doesnt seem to be the case with my trials bike (a mission prodigy from a few years back) Cheers for help Quote Link to comment Share on other sites More sharing options...
ilikeriding Posted August 4, 2007 Report Share Posted August 4, 2007 depends upon your chainline Quote Link to comment Share on other sites More sharing options...
Monty Man Sam Posted August 4, 2007 Author Report Share Posted August 4, 2007 what is the chainline Quote Link to comment Share on other sites More sharing options...
ilikeriding Posted August 4, 2007 Report Share Posted August 4, 2007 (edited) well if you get a bb that is too short, you may not be able to get the spacing on the rear sprocket set up in line with the front ont, so the line your chain takes would be wonky causing it to skipor you might catch your foot on your brake as the pedals dont come out far enough Edited August 4, 2007 by afroman Quote Link to comment Share on other sites More sharing options...
steve-r Posted August 4, 2007 Report Share Posted August 4, 2007 ruler Quote Link to comment Share on other sites More sharing options...
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