Hello all.
Building an AM9 up which has a 73mm shell, got a SRAM Dub boost chainset, DUB BSA BB and trying to work out which spacers I need to use - the SRAM manual lists MTB and MTB wide for BSA shells with differing amounts of spacers, I think MTB wide means boost?? Am I right?!
Freaking standards!!!
Boost doesn't affect BB width
I can't work out what's going on with DUB and "Wide" options (was trying to work out the "Road Wide" options earlier this week).
Here's the mountain bike guide...
73 English Threaded
MTB :: DUB BSA 73 MTB :: 00.6418.015.000
MTB Wide :: DUB BSA 73 MTB Wide :: 00.6418.015.005
Super Boost + :: DUB BSA 73 SB+ :: 00.6418.019.000
MTB Ai :: Cannondale DUB BSA 73 MTB Ai :: 00.6418.031.001
All those part numbers... are they the same BB, but with different spacers supplied? I don't know.
As honourablegeorge says... your "boost" chainset is probably a standard set of cranks with the correct offset direct mount chainring to give it a boost chainline. I don't know what a "MTB Wide Crankset" is.
Pretty sure it'll be a 4.5mm you'll want. Get it wrong and it'll be either too tight and your cranks won't turn, or it'll be too loose and the adjuster won't take up the slack.