I have a 2011 Commencal Supreme DHV3 Team edition and I need to replace the bottom bracket. The problem is that I am confused about what the correct model to buy is.
The tech book for the bike states:
- BOTTOM BRACKET WIDTH Type Cranks 83mm Press Fit Shimano BB92
However, doing some online googling I found this thread where the poster has been told that he should buy either
- Shimano BB71 MTB Press Fit Bottom Bracket Size - 89.5/92mm
- Shimano BB91 Road Press Fit Bottom Bracket Size - 86mm
This page states that BB91 and BB92 are identical, however this doesn't seem to be the case to me as the BB92 has a shell width of 91.5mm
I'm puzzled as they have different BB numbers and different widths too (the BB92 has a shell width of 91.5mm). I would naturally just choose the BB92 from the Commencal tech book, but can't find any Shimano BB92s for sale in the UK.
Which model do I go for? Will a BB71 do?
Unfortunately I am not in a situation where I can look at my existing bottom bracket as it has transpired that an incorrect BB was fitted to my frame when I had it serviced about 6 months ago, and I am no longer in the same country...