Balls Deep trials team Posted November 2, 2010 Report Share Posted November 2, 2010 hi people i have a onza 320 with bad chainrub im using a 127.5mm lenth bottom bracket and was wondering what lenth bb everyone else uses in there 320 ? and will a 118mm bb work okay in it ? cheers Quote Link to comment Share on other sites More sharing options...
p_ruskin Posted November 2, 2010 Report Share Posted November 2, 2010 hi people i have a onza 320 with bad chainrub im using a 127.5mm lenth bottom bracket and was wondering what lenth bb everyone else uses in there 320 ? and will a 118mm bb work okay in it ? cheers Get a 122.5 its the only length i have found that doesn't rub at all, makes the chain line perfect. Quote Link to comment Share on other sites More sharing options...
dirt jumper jake Posted November 2, 2010 Report Share Posted November 2, 2010 if my calculations are correct, one about this wide: |-------------------------------------------------| shall be correct Quote Link to comment Share on other sites More sharing options...
Balls Deep trials team Posted November 2, 2010 Author Report Share Posted November 2, 2010 (edited) if my calculations are correct, one about this wide: |-------------------------------------------------| shall be correct looks a bit short ...at least >------------------------------------------------------------------------------------------------------< Edited November 2, 2010 by Balls Deep trials team Quote Link to comment Share on other sites More sharing options...
dirt jumper jake Posted November 2, 2010 Report Share Posted November 2, 2010 if my calculations are correct, one about this wide: |-------------------------------------------------| shall be correct* *not to scale Quote Link to comment Share on other sites More sharing options...
Balls Deep trials team Posted November 2, 2010 Author Report Share Posted November 2, 2010 *not to scale doesnt rele help then ... Quote Link to comment Share on other sites More sharing options...
dannytrialskid Posted November 2, 2010 Report Share Posted November 2, 2010 Richard as I told you before. You know I have a Limey 320. You know I have a 122.5mm BB. It works perfect. 118mm will be far too small for it. Get a 122.5mm BB and it's pure win! Quote Link to comment Share on other sites More sharing options...
Balls Deep trials team Posted November 2, 2010 Author Report Share Posted November 2, 2010 Richard as I told you before. You know I have a Limey 320. You know I have a 122.5mm BB. It works perfect. 118mm will be far too small for it. Get a 122.5mm BB and it's pure win! where can i get one from though tarty on have the try-all one and im not spending £52 on a bb just to last me till xmas hence why i was looking at getting a cheap 118mm bb Quote Link to comment Share on other sites More sharing options...
Sponge Posted November 2, 2010 Report Share Posted November 2, 2010 Don't 'eyeball' it and hope for the best. Here, you can pre-calculate exactly what the perfect BB length you'll need is for your set up: Bit of simple maths and you've got a better chainline than 98% of mods. http://www.gsportbmx.com/2005/05/chain/ ^This artcile is worth its weight in gold. I managed to calculate the perfect chainlines after reading this. Super simple, and saves needing to experiment with different BB lengths. Quote Link to comment Share on other sites More sharing options...
Balls Deep trials team Posted November 2, 2010 Author Report Share Posted November 2, 2010 Don't 'eyeball' it and hope for the best. Here, you can pre-calculate exactly what the perfect BB length you'll need is for your set up: Bit of simple maths and you've got a better chainline than 98% of mods. http://www.gsportbmx.com/2005/05/chain/ ^This artcile is worth its weight in gold. I managed to calculate the perfect chainlines after reading this. Super simple, and saves needing to experiment with different BB lengths. thankyou Quote Link to comment Share on other sites More sharing options...
Mark W Posted November 2, 2010 Report Share Posted November 2, 2010 Although George's thing doesn't really help in terms of freewheels hitting BB shells or BB yokes and cranks hitting stays, unfortunately... Quote Link to comment Share on other sites More sharing options...
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