XTR M900 Hub dimensions.

[tkboyle]

Hi,

Are the XTR-M900 front and rear hub dimensions the same as the XT-M737 and MT-M738?

 

[Inigo Montoya]

afaik all shimano hubs have the same flange/hub shell dimensions.

 

[tkboyle]

Thank you.

 

[utahdog2003]

At least from generation to generation, maybe. As in, all Paralax hubs may have the same demensions, all HG hubs may have the same demensions, etc...I know for a fact that XT uniglide hubs are narrower, flange to flange, than their HG counterparts, even though cosmetically they are very similar.

I think the blanket statement about them all being the same is a little misleading. The caveat that within a generation or model year could narrow down the issue enough to make Inigo's comments accurate.

 

[Agency_Scum]

Non-disc Shimano mtb hub dimensions are all the same from year one to the present day.

 

[Woz]

Re:

Yes, bumping an old thread with more info and questions because this is doing my head in :facepalm:

I've been looking on the Edd spoke calculator (http://leonard.io/edd/) and seeing differences on hub specs.

Looks like hub flange diameters are all the same, but there are differences in the specified
rear flange to center distances. This could be down to measurement errors, differences in
130mm or 135mm OLN measurements and I'm assuming differences in 7 speed (30.5mm freehub
lenght) or 8 speed (34.5mm freehub length) but don't know for sure.

Does anyone know for fact that a M900 hub (8 speed, 135 OLN) can be replaced with a
parallex type (8 speed, 135 OLN) rear hub like XT M737, LX M565, STX-RC MC38 or even
newer XT M750, LX M570 etc. without the need of getting different spokes :?:

Same goes for the front too, but it looks like these are all the same specs since year 1 to now,
but again if someone could confirm this it would be appreciated.

 

[FluffyChicken]

Re:

Have a look at the actual effect altering the flange from centre dimensions actually do.

ERD and flange diameter have the largest effect.


I cannot remember if I put the m900 and m737 up there. I probably did.
I think that might be the one I asked if some could be removed.

Anyway sideways movement has little effect, spoke hole diameter is also adding to the error but you'll find they are within a mm, which is close enough given spoke hole diameter are actually the same iirc

 

[Woz]

Re:

I may have been worrying too much - seems practically the spoke lengths are the same within about +/- 1mm,
so I hope my spokes in 2mm increments will cover any variation.

FC: Makes sense what you say considering basic trigonometry :facepalm:

(BTW: noted an error with the M765 entry, looks like left and right flange distances are the wrong way around, or
measurements are from the drop-outs and not the hub center).