2023 Shimano XT M8120 12s chainset + bottom bracket

170mm / 30t - for a 68/73mm BSA threaded BB shell.

Includes:
- new Nukeproof BSA 24mm bottom bracket for Hollowtech 24mm in box with x1 2.5mm spacer
- instructions
- x2 3mm spacers
- pre-load bolt
- factory fitted protective film on both arms

This will return either:
- a 55mm chainline with both 3mm spacers
- or a 52.5mm (quasi Boost) chainline if you put the BB's 2.5mm spacer on the non-drive side (73mm BSA).
- or a 52mm perfect Boost chainline if you put both supplied 3mm spacers on the non-drive side. Make sure you have enough chainring clearance though, compatibility may vary from frame to frame. This worked perfectly on a boost 148mm 2023 Ragley Big Al.

£5 for UK shipping and PayPal fees.