Pieterg Posted March 25, 2015 Posted March 25, 2015 I bought a 2014 Specialized Epic Comp bike with X9 Group set .I want to change the group set to Shimano XTR 3x10 but the bottom bracket is the problem, I can’t find a Shimano PF bottom bracket is there a conversion that I can change to?
Mike Bike Posted March 25, 2015 Posted March 25, 2015 there is a shimano PF BB part no xtr bb-sm94, buycycle have it @ R429
MaxTBehrens Posted March 25, 2015 Posted March 25, 2015 Press fit frames can easily take the larger spindle size, making way for the pf30 or bb30 style cranksets. These two are basically the same thing with a spindle diameter of 30mm. Shimano still uses the BSA system which has a spindle diameter of 24mm. Sram has a GXP system that is also 24mm or in some cases 22mm. There are adapters available to fit almost everything to anything, and especially one that fits over a BSA or GXP crankset with a 24mm spindle that makes it possible to fit it into the larger bb30 or pf30 bottom bracket.But as Mike said, there are also pressfit/pf bottom brackets that has a 24mm inside diameter for the BSA or GXP cranksets. Bottom Brackets:http://www.cwcycles.co.za/product/shimano-press-fit-bb-mtb-smbb91-42ahttp://www.cwcycles.co.za/product/alero-shimano-ceramic-press-fit-bbhttp://www.evobikes.co.za/components/bottom-brackets/shimano-press-fit-bottom-bracket-hollowtech-ii-sm-bb71-41c.htmlhttp://www.evobikes.co.za/components/bottom-brackets/rotor-bb-pressfit-4124.html The one thing you have to watch out for is the spindle length. The PF frames has a smaller bottom bracket shell allowing for a smaller spindle length. So putting your XTR crankset on a PF frame might result in the spindle being too long. You might get spacers for that, But I am not sure. Make sure you get the right spindle length to fit your frame
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