Bicycles Asked by Jan Detlefsen on December 22, 2020
I bought a downhill frame (Commencal DH Supreme 2012) that I want to build up with parts myself.
Now I’m trying to pick a suitable crankset for the 107mm bottom bracket. Having a hard time finding anything. It seems like not even the Saint group supports 107mm BBs. Where should I start searching? I’m not looking for specific advice but I need to find a place start or maybe I’m not getting it right with the specs.
According to the tech sheet at http://www.commencal-store.co.uk/PBSCProduct.asp?ItmID=12450127 you need a Press-fit BB.
PF107 should have 41mm diameter cups, have the same overall width as an External-bearing BB in an 83mm shell, and be compatible with the same cranks as "normal" external-83mm BBs.
SM-BB71 should work in your frame, and allow you to fit FC-M815 cranks. The cups will be the same as the "73mm" pressfit BBs, but the inner cover (aka spacer tube) is longer for "83mm".
Correct answer by Emyr on December 22, 2020
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