Dub Bottom bracket spacers query

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…

https://www.sram.com/globalassets/document-hierarchy/compatibility-map/mtb/gen0000000006073-rev-a-compatibility-map-dub-choosing-an-mtb-bottom-bracket.pdf

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.