12 speed XT with non-boost?

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This topic has 4 replies, 4 voices, and was last updated 4 years ago by Mat.

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12 speed XT with non-boost?
Mat
Full Member

Shimano look like they make the M8100 XT crankset in multiple different q factors, I’m assuming to address the chainline for different rear hub standards. However online retails don’t seem to be offering the different versions. What does STW think i need for a 135mm QR rear hub?

Thanks
Mat

Posted 4 years ago

Onzadog
Free Member

I thought the Q factor was not related to chainline. I think for 12 speed the shimano stuff works with a 52mm chainline for boost and non-boost.

Posted 4 years ago

robo89
Free Member

That 52 chainline for everything but superboost is on odd one from shimano, Q factor and chainline are seperate things, Q factor only really comes into play with superboost imo, my heels very rarely catch my seat stays with boost.

Posted 4 years ago

LAT
Full Member

Each of the different chain lines on xt and SLX cranks has a different q-factor. For 135 you’d need the one with the lowest value (50mm probably, but not looked at the non boost cranks).

Posted 4 years ago

Mat
Full Member

I realise Q-factor and chainline are different measurements but I assume:

Q-factor = chainline + width from spider to outside of crank?

This seems sugguest it is an issue?

The specs, including the Q-factor — the width between the outside face of each pedal eyelet — of each version of the cranks is as follows:

52mm chainline, for 142 or 148mm rear end, 172mm Q-factor
55mm chainline, for 148mm rear-end with wider tyres, 178mm Q-factor
56.5mm chainline, for Super Boost 157mm rear-end, 181mm Q-factor

A double chainset is available in one ratio (36-26) for both groupsets. It’s worth noting that this is the first ever generation of XT and SLX to totally do away with a triple chainring option. XTR is also only available as a 1x or 2x option. The specs for the double crank are:

51.8mm chainline for 148mm rear-end, 178mm Q-factor

If you are looking for a narrower Q-factor, XT or SLX isn’t for you — only XTR M9100 is available with a Q-factor narrower than 172mm, coming in at 162 or 168mm depending on the option you go for.

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Posted 4 years ago