I am thinking of building a new carbon hardtail and I would like to equip it with a 12-speed Shimano crankset (SLX, XT or XTR). Now I see that Shimano offers all Cranks with three different chainline options: 52mm, 55mm and 56,5mm. The Frame ist Boost 148mm standard. Bottom bracket is PressFit BB9…

I just replaced my M7000 cranks with M7100 The older M7000-B 11 speed boost is I believe 53mm Went with the 55mm M7120 initially (which comes with a stupid washer that goes on the spindle and looks like it will pickup dirt seems like a cheap design to me). Chain seemed to want to come off when I b…

thanks for the reply. I also looked at the Q-factor and would definitely also prefer the narrower Q-factor. Still, I find it strange that there is no clear statement on when to use which chainline version. Seems like both (52mm and 55mm) will be working somehow with boost factor!?

I think a lot depends on your frame. Are you sure you’re going to have enough clearance between the chainstays & the crank arms with the smaller Q/chainline? I’m pretty sure you will but what about with a crank arm based power meter should you ever choose to go that route? My Orbea Oiz came specced…

What did you go with? I am working on a new crankset for a Chisel, and plan to go for narrow q-factor. Debating between the XT 8100 (if I can find it) with the 172mm q-factor; or springing for the XTR 9100 for that road-like 162mm q-factor. Any recommendations from anyone?

Went with the narrowest q-factor (52mm Version) and it shifts fine in every situation.

Where did you end up here? Curious if the frame would take a 162mm crank or had to resort to the 172 or stock 178. Thanks

Shimano 12-speed MTB Cranks Chainline

Equipment

brandoninboco July 18, 2022, 8:03pm 8

i found a set of the MT900 cranks (172mm) with a Stages for a good deal, so went that way. I never tried the XTR.

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Shimano 12-speed MTB Cranks Chainline

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