I would seriously doubt it's in the arms. Consider all the lengths Shimano offeres cranks in and you think they'd make special ones for a narrower Q-Factor.
The most cost effective way is the spindle.
XTR M9100-1 crankset clearance
Is anyone able to comment on the difference in frame clearance (if any) between the XTR M9100-1 crank and the M9120. The M9120 is supposed to have 168mm q factor, but 9100 is supposed to have 162. Not sure if this is achieved by a thinner crank, or if the cranks arms have less angle, or are otherwise closer to the frame.
I have a boost frame with a reasonably wide set of chainstays, so am not sure if it'll clear or not (i currently have XT M8100, which are quite a bit wider with 172 q factor). If the internal face of the crank was simply closer to the frame by the difference in q factor, it would be easy to calculate, but not clear if the cranks are the same thinckness.
A technical drawing of the cranks would obviously make clear, but haven't been able to find one of those anywhere.
Thanks to anyone who can help!
I have a boost frame with a reasonably wide set of chainstays, so am not sure if it'll clear or not (i currently have XT M8100, which are quite a bit wider with 172 q factor). If the internal face of the crank was simply closer to the frame by the difference in q factor, it would be easy to calculate, but not clear if the cranks are the same thinckness.
A technical drawing of the cranks would obviously make clear, but haven't been able to find one of those anywhere.
Thanks to anyone who can help!
1 - 7 of 7 Posts
The most cost effective way is the spindle.
I'm not sure, but this article implies the 9120 "enduro" version uses extra spindle spacers versus the 9100 "xc race" version.
bikerumor.com
Hands On: Complete Shimano XTR M9100 1 x 12 group with actual weights
The full Shimano XTR 1 x 12 group is now available. Curious about the actual weights, especially the new crankset? Find them all inside...
bikerumor.com
ok, thanks. Perhaps the spindle spacer info reinforces the likelihood it's via the spindle length, which seems like a reasonable assumption.
Still not sure about difference between the XT M8100 and the XTR crank arms though, they could be different in other ways?
I just don't want to end up having to fit an expensive crank to be sure, then find it doesn't work and not be able to return it.
Still not sure about difference between the XT M8100 and the XTR crank arms though, they could be different in other ways?
I just don't want to end up having to fit an expensive crank to be sure, then find it doesn't work and not be able to return it.
I have the SLX M7100 crank. The dealer manual is the same for all 3 cranks M7100, M7120 and M7130. The manual mentions that a spacer is required between the BB and the crank arm for 7120 and 7130. You can see if you want by downloading it from si.shimano.com
Based on this, I think each crank has the identical arms but 7120 and 7130 have slightly longer spindles.
Based on this, I think each crank has the identical arms but 7120 and 7130 have slightly longer spindles.
Is anyone able to comment on the difference in frame clearance (if any) between the XTR M9100-1 crank and the M9120. The M9120 is supposed to have 168mm q factor, but 9100 is supposed to have 162. Not sure if this is achieved by a thinner crank, or if the cranks arms have less angle, or are otherwise closer to the frame.
I have a boost frame with a reasonably wide set of chainstays, so am not sure if it'll clear or not (i currently have XT M8100, which are quite a bit wider with 172 q factor). If the internal face of the crank was simply closer to the frame by the difference in q factor, it would be easy to calculate, but not clear if the cranks are the same thinckness.
A technical drawing of the cranks would obviously make clear, but haven't been able to find one of those anywhere.
Thanks to anyone who can help!
I have an M9100 on a non-boost (142mm) frame and I was pretty worried about how close the cranks are to the frame, so for a boosted frame I would really be careful before you buy anything. You may want to ask your local bike shop and/or ask the crankset seller if it can fit boost or not. Unlike M9000 the M9100 cranks are straight. And I don't know why this is, maybe because I'm using an Alivio bottom bracket and it's a tiny bit off the recommended XTR one, but one crank is closer to the frame than the other. It doesn't clear by much! Another annoying thing about M9100 is that the left side loosens up and has to be tightened every several dozen miles. You have to loosen the preload dial on that side, tighten the axle pretty hard with a hex, then finger screw the preload tight. And hope that stays tight for a few weeks. Do I regret buying M9100? No but the M9000 is the same weight, not really any price difference, and does have some small but real advantages at least to me personally. And if the bolts are tightened right, they don't loosen on M9000. The M9100 looks more modern and cool, but it depends on if you want your bike to look better or if you don't care and are more practical about the small relative benefits of M9000. Nothing wrong with M9000 at all.
The difference is the spindle length, not the arms. They include a spacer with the kit, but there is no reason you can't split that spacer's length up between left and right (behind the bottom bracket, even, would be best) if it doesn't mess up the chain line.
Call Shimano. I've had one that does that, they warrantied the crank and it hasn't happened since.[...]Another annoying thing about M9100 is that the left side loosens up and has to be tightened every several dozen miles. You have to loosen the preload dial on that side, tighten the axle pretty hard with a hex, then finger screw the preload tight. And hope that stays tight for a few weeks. [...]
1 - 7 of 7 Posts
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