SRAM Bottom Bracket Spacer Kit DUB MTB Wide Spacing Out Sometimes your chainring doesn't match up perfectly with your cassette, so you need to space it out to get the proper chain line. The SRAM Bottom Bracket Spacer Kit DUB MTB Wide is designed to work with SRAM DUB BB30, BSA, PF, PF30, and T47 bottom brackets. It comes with one 5. 0mm, one 7. 5mm, and two 3. 0mm spacers. Features Compatible with SRAM DUB BB30, BSA, PF, PF30, and T47 bottom brackets Spacers included: one 5. 0mm, one 7. 5mm, and two 3. 0mm spacers SRAM Part Number: 11. 6418. 002. 003 | Sram | Bottom Bracket Spacer Kit Dub Mtb Wide Sizes 1X5. 0Mm, 1X7. 5Mm And 2X3. 0Mm