XTR M900 crank q-factor??

[hjb1000]

Hi fellow Retrobikers,

I'm looking for a nice low q-factor crank for my 1x10 hardtail.
Square taper cranks are a good place to start for this and my shortlist is either XT M730's or XTR M900's.

I know the M730 q-factor can be made quite low with the right BB, around 150mm with 107mm BB.
But what about the XTR M900 with a 107mm bottom bracket? I'm hoping it is less than 160mm...

 

[FluffyChicken]

Re:

That the xtr's standard setup.

Given the recess sits inside the bottom bracket shellmon 107mm un90's and the crank arms where a mm from the chainstays on my 1991 bike that would be its shortest axle. But other axles may vary, I know raceface ones do.

Bikepro used to list the measured qFactors with their setup but the site not there at the moment.

The ends are tapered a bit but still quite chunky so doubt they'll be the lowest q factor. Iirc it was about 170*. But setups will vary that of course.

You may be better of with the compact cranks like the 737 as the pedal endsvwhere not are chunky iirc.



*it should be noted bikepro used their own setup methods. I have no idea what that was.

 

[hjb1000]

Re:

Thank you for the great info. I think sticking with M730 like you say is a better option for low q-factor. Cheers

 

[FluffyChicken]

Re: Re:

Thank you for the great info. I think sticking with M730 like you say is a better option for low q-factor. Cheers

Why?

You don't gain ankle clearence and you're are still limited by your stays.

If you have both try them and measure them, I bet its only a few mm either way which is negligible in the long run, especially when you consider ankle and shoe clearance of the low profile style cranks.


____

Now bikepro is upand having a read there seems to be a big flaw in their qfactor measurements, I would ignore them and just measure your own. They don't take into account the cranks profile and design for a particular bottom bracket length.