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Micro Spline 135mm QR Hubs?

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Micro Spline 135mm QR Hubs?

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flag theshortestcharles
Posted: Nov 12, 2020 at 16:37 Quote
Just bought a 2020 Rocky Mountain Soul 20 (https://www.bikes.com/en/bikes/soul/2020) and I'm already thinking about upgrading the drivetrain, but it has a regular old 135mm QR rear end. I'm a pretty light rider (around 130lbs/59kg) so I'm not worried about stiffness, but it is really limiting for future upgrades. Does anybody know of any QR hubs with a Micro Spline hub body? (I'm looking at that new Deore 12 speed group, the 11 speed would work with my current HG freehub body but it doesn't get that new shifting magic on the 12 speed cassettes.)
So far I've only found this (https://bike.shimano.com/en-SG/product/component/shimano/FH-MT500.html) which is out of stock everywhere I've checked, are there other hubs that will work (also would the short rear end be a nightmare for finding a good chain line with a 12 speed drivetrain)?
flag anoplura
Posted: Nov 13, 2020 at 0:38 Quote
As far as I know, Hope is the only manufacturer who offers a 135mm spaced hub with a 12-speed compatible freehub. I know they do XD freehubs in that spacing, but I suggest contacting them to confirm that they offer Micro Spline in 135.

10, 11, and 12 speed cassettes all take up about the same width. They just use progressively thinner cogs and closer spacing (and narrower chains) to make everything fit. 11 and 12 speed drivetrains are definitely fussier than 10-speed, but that is mostly due to narrower tolerances and newer, less tested chain designs.

If your chain line is good, then you'll be ok with 12 speeds, but it may take some trial and error to dial in. If your chain line is questionable, then moving up to 11 or 12 speeds will make it a lot harder to use all of your gears.
flag Reaperactual
Posted: Nov 13, 2020 at 1:10 Quote
As above, Hope Fortus wheels with Pro 4 non Boost (142x12 thru axle) hubs usually come supplied with a quick release end cap conversion kit and can be bought with a Microspline freehub fitted.

Ideally would aim for somewhere around a 49-50mm chainline if chainstay and tyre clearance will allow. You would need a Shimano compatible direct mount chainring with a 3mm offset, maybe Wolftooth or similar make something suitable?
flag theshortestcharles
Posted: Nov 13, 2020 at 10:44 Quote
Reaperactual wrote:
Ideally would aim for somewhere around a 49-50mm chainline if chainstay and tyre clearance will allow. You would need a Shimano compatible direct mount chainring with a 3mm offset, maybe Wolftooth or similar make something suitable?
I don't have a pair of calipers to measure exactly but using a ruler the chainline's about 52-53mm (I had to estimate the chainring-BB distance but from the edge of the BB to the center is 38mm). Turns out Shimano makes a Deore crankset that's supposed to work with 135mm/142mm (FC-M6100-1), and it has a chainline of 52mm which seems like it should work fine. Thanks for suggesting the Pro 4s, although they're most likely out of my price range (Jenson USA has the MS body available in 135 but it's over $90 on top of the cost of the hub).
flag Reaperactual
Posted: Nov 13, 2020 at 11:28 Quote
Would suggest DT Swiss wheels will be a good option too but they seem expensive in comparison with Hope wheels, in the UK anyhow.

If 52mm chainline is working for you now on lower gears then all good to keep the same.

As Anoplura said 11/12 speed set ups get more reliant on good chainline but only need to think about tweaking if you have problems.

I believe Shimano redesigned tooth profile on the new groupset's chainrings somehow to work well with a 52mm chainline on non Boost frames.
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