Suitability of Shimano XTR M9000-TL Race wheelset for Gravel bike

[DRZRM]

So I'm waiting on a disc gravel frame that will take 100x15mm/142mmx12 TA and will clear 40+mm on 700 and ~1.9" on 27.5. I'd been planning on building a 700 wheelset (I wound up with a 27.5 XT wheelset) but saw some good deals on XTR M9000-TL 29 Race wheels, which are light and strong. Is there any issue with using this wheelset for my 700/29er wheel needs. I'll be running tubeless tires 38mm or larger. Any significant drawbacks over 32 hole handbuilts.

[justaute]

Will you be running road or mtn cassette/drive-train? If this wheelset has XTR hubs, then its free-hub won't be compatible with road cassette.

[donevwil]

I believe these have a max pressure rating of only 44psi. Fine for large volume tires, but if you want to run smaller tires and/or want to run higher pressures it's likely worth some thought.

[ptourkin]

Originally Posted by donevwil

I believe these have a max pressure rating of only 44psi. Fine for large volume tires, but if you want to run smaller tires and/or want to run higher pressures it's likely worth some thought.

I went a similar route with my gravel build. My 27.5 wheelset are wide I9 rims (built by Enve in 2015) and I'm running Switchback Hill 48s on them at 30psi and below. My 700c set are mtb Enves. Right now I am running Specialized Roubaix 30s on them at 70 psi (with tubes though) and have had them up to 80. This bike is my backup/climbing bike for the 508.

Regarding the cassette body - if you want more road gearing on the XTR, you can use the new Ultegra 11-34.

[DRZRM]

I have an Ultegra Hydro group, and I was going to build my wheels around an I-9 hubs and use a Wolftooth link to use the Ultegra RD with a MTB cassette, but if I got XTR wheels, I'd likely go Wolftooth Tenpin and XTR RD (you know, matching style) maybe 1x11 with an 11-40, but I might stick with 2x11 with the 11-36 cassette...do they make that cassette for a MTB hub?

Ptourkin, that Ultegra cassette won't go on either the XTR or the I-9 Torch hub, will it?

I guess 44 PSI is a bit low for a 35mm Schwalbe G-One (the smallest tire I could ever imagine running on this bike) on the road at 220 lbs. They print rate at 45-70. I bet I'd be fine never exceeding 45 (44psi) but that seems a bit closer than I'm comfortable with.

Originally Posted by justaute

Will you be running road or mtn cassette/drive-train? If this wheelset has XTR hubs, then its free-hub won't be compatible with road cassette.

[hokoman]

Originally Posted by DRZRM

I have an Ultegra Hydro group, and I was going to build my wheels around an I-9 hubs and use a Wolftooth link to use the Ultegra RD with a MTB cassette, but if I got XTR wheels, I'd likely go Wolftooth Tenpin and XTR RD (you know, matching style) maybe 1x11 with an 11-40, but I might stick with 2x11 with the 11-36 cassette...do they make that cassette for a MTB hub?

Ptourkin, that Ultegra cassette won't go on either the XTR or the I-9 Torch hub, will it?

The new 8000 11-34 Will fit a mtn hub. I put one on my classic king hubs.

[justaute]

Nice...appreciate the update on this new development. I wonder what modification Shimano made to the cassette.

How do you find the shifting vis-a-vis on your road hub?

Originally Posted by hokoman

The new 8000 11-34 Will fit a mtn hub. I put one on my classic king hubs.

[oldpotatoe]

Originally Posted by justaute

Will you be running road or mtn cassette/drive-train? If this wheelset has XTR hubs, then its free-hub won't be compatible with road cassette.

It's actually compatible with any shimano road cogset as long as it's 8-9-10s. Not road 11s but yes MTB 11s cogset. But yes compatible with new uotegra 11-34 11s cogset. Way dished bigger cogs.

[justaute]

Thanks...should have made my point more clear. I was referring to 11 speed.

Originally Posted by oldpotatoe

It's actually compatible with any shimano road cogset as long as it's 8-9-10s. Not road 11s but yes MTB 11s cogset.

[sandyrs]

The ultegra 8000 11-34 cassette is compatible with 8-10sp (i.e. MTB 11sp) freehubs, unlike all other Shimano 11s road cassettes.

[eBAUMANN]

Originally Posted by sandyrs

The ultegra 8000 11-34 cassette is compatible with 8-10sp (i.e. MTB 11sp) freehubs, unlike all other Shimano 11s road cassettes.

is that thing available to buy yet?
cause i want one.

[dddd]

Yeah, I have an online acquaintance in Seattle who bought one just last week.

About the tire pressure rating of rims issue:

The limit is defined more by the indirect function of tire casing tension, as opposed to just inflation pressure. The manufacturers thus can only set an accurate pressure limit if they are making an assumption about tire size (width)!
The tension in the tire casing that can fail a rim sidewall is not simply proportional to air pressure, but to air pressure multiplied by tire casing width or circumference.

Thus, an MTB rim intended for a 2.1" tire might be rated at 50psi, but with a 25mm road tire the safe limit would be approximately 100psi, and perhaps higher, since the sidewalls pull outward at less of a "perpendicular" angle to the rim sidewall than with the 2.1" tire.

So it seems like the manufacturers are willing to limit their rim's buyer pool by offering up these CYA pressure ratings which apply to the largest tire widths that the presumed buyer will use.

[Gummee]

Originally Posted by DRZRM

I have an Ultegra Hydro group, and I was going to build my wheels around an I-9 hubs and use a Wolftooth link to use the Ultegra RD with a MTB cassette, but if I got XTR wheels, I'd likely go Wolftooth Tenpin and XTR RD (you know, matching style) maybe 1x11 with an 11-40, but I might stick with 2x11 with the 11-36 cassette...do they make that cassette for a MTB hub?

Ptourkin, that Ultegra cassette won't go on either the XTR or the I-9 Torch hub, will it?

I guess 44 PSI is a bit low for a 35mm Schwalbe G-One (the smallest tire I could ever imagine running on this bike) on the road at 220 lbs. They print rate at 45-70. I bet I'd be fine never exceeding 45 (44psi) but that seems a bit closer than I'm comfortable with.

I know it's an expensive gamble, but Shimano is notoriously conservative with their figures. They want things to be 'private proof' to use an Army term.

Don't hold me to it (cause innerwebs advice is worth what you pay for it), but I'd bet you'd be OK with the XTR wheels.

MTB 11sp cassettes and the 11-34 Ultegra will work on MTB hubs.

...but if you want to go lower than that 34t big cog, you're hosed with a MTB hubeset

Now, bump the budget and get someone to build with disc 240s hubs and you can run em all kinds of ways.

M

[sandyrs]

Originally Posted by eBAUMANN

is that thing available to buy yet?
cause i want one.

https://www.excelsports.com/main.asp...jor=1&minor=10

[DRZRM]

Just to return to an old thread so others can avoid making the mistake I did. Unless I don't understand how to put a cassette on a hub, the information Shimano released on their new Ultegra hub is misleading.

They state in their description (I grabbed their copy from here):

• 11-34 is compatible with Shimano road and mountain 11-spd freehubs

but the standard Ultegra CS-R8000 11 Speed 11-34 cassette is not compatible with both road 11 and MTB 9-10-11 hubs as stated. In fact they make a different Ultegra 11-speed 11-34 hub that is only compatible with MTB/road 10 speed hubs, but you need to order it specifically. This text is from a much clearer article from Cyclocross Magazine

With the addition of the new 11-34T CS-HG800-11 cassette, ULTEGRA further expands gearing options for riders of any terrain. Designed to fit both MTB- and road-specific (with spacer) wheelsets, mixed terrain riders are provided with more wheelset options than ever before.

• CS-R8000 Gear combinations/Weight: 11-25T (232g), 11-28T (251g), 11-30T (269g), 11-32 (292g), 12-25T (243g), 14-28T (300g)
• CS-HG800-11 Gear combinations/Weight: 11-34T (335g)

So the part you actually need to order to make this work on your gravel bike running MTB hubs is the CS-HG800 11-34 11 speed cassette.

Then , if you are so inclined, you can run an Ultegra 11 speed group plug and play without any WolfTooth bits, etc. Hope this saves someone some time.

Originally Posted by sandyrs

The ultegra 8000 11-34 cassette is compatible with 8-10sp (i.e. MTB 11sp) freehubs, unlike all other Shimano 11s road cassettes.