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29" wheelset on road bike?

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29" wheelset on road bike?

Old 04-25-16, 11:46 PM
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ShadowGray
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29" wheelset on road bike?

I love the look of this wheelset: Crank Brothers Cobalt 2 29-in Mountain Wheelset

It's fairly affordable and reasonable weight. My next bike will most likely have 142mm rear spacing (CX bike or endurance road) and disc brakes.

Would I have any issue with running these wheels on a road bike? This one for example: Raleigh Bicycles - Merit Elite. The wheelset it comes with are already 12x142mm rear, 15mm front through-hole, it has RS785 brakes (I assume 160mm/140mm rotors), and a 11spd Shimano cassette.
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Old 04-25-16, 11:47 PM
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The wheels should be fine as long as you don't mount tires.
You may have a tire clearance issue with fatter tires.

ALSO- Does that bike have the same axle diameters etc?
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Old 04-25-16, 11:52 PM
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Originally Posted by Bill Kapaun View Post
The wheels should be fine as long as you don't mount tires.
You may have a tire clearance issue with fatter tires.
From what I understand the rims between 700 and 29 are the same. So I would use 25/28c tires on this wheeset. Then I would get 35c CX tires for the stock wheelset, giving me two wheelsets to fast swap.

I'm more worried about cassette and brake rotor compatibility.
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Old 04-26-16, 05:01 AM
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They will work, but the 21mm internal width will make any tires you mount end up wider than the advertised width. I currently have a set of 28's mounted to a rim with an internal width of 19mm and the inflated tires measure 30mm. I would mount the CX tires on this wheelset, but 35's would not fit on the frame you linked. The max tire size for that frame is 32.

As far as disc compatibility, it should work fine. Fitting an 11 speed road cassette may be an issue. The Crank Brothers website gives no info about whether this is an 11 speed freehub.

Last edited by dsaul; 04-26-16 at 05:08 AM.
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Old 04-26-16, 05:24 AM
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11 speed ROAD cassette will not fit.
Shimano XTR M9000 11-speed Component Compatibility FAQs - Useful for Cyclocross? Gravel? - Cyclocross Magazine - Cyclocross News, Races, Bikes, Photos, Videos
I'm tired and that is the best link I can find atm.

"Why didn’t Shimano make 11-speed road cassettes compatible on 10-speed hubs?

The smaller large cogs of road-oriented cassettes, even with a 28 or 32 tooth large cog, would interfere with the spokes if fit on old freehubs, and if it the large cog clears the spokes, the extra width of the chain would likely cause problems."

In other words 11 speed shimano mtn cassettes work fine on the regular old 10 speed freehubs those wheels use but road 11 speed doesn't. The only mtn bike hubs that will work for sure are all Mavics which for some reason started making their freehub body's wider a long time ago. You have to run a spacer to use a normal mtn bike cassette with those. Take the spacer off and 11 speed road fit fine.
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Old 04-26-16, 07:00 AM
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Thanks for the explanation

That's a shame. There aren't a lot of 700c disc options that fall into my price range that I really like but the technology is more mature on 29ers.
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Old 04-26-16, 12:26 PM
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I'm in the same boat. Need a second set of wheels for my cross bike that runs a 135mm rear hub, 11 speed road, and I'd really like center lock disc brakes since I already have a set laying around. It is really easy to find mtn bike wheels that would be great except for that 11 speed road cassette part.

I believe DT Swiss mtn hubs will also work but you have to change out the freehub body for their 11 speed road freehub body which is around $70-90.
DT Swiss Freehub Body for 11 Speed Shimano Compatibility - Wheelbuilder.com
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Old 04-26-16, 01:29 PM
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I've been running an 11-speed road cassette on a 10-speed MTB hub by removing the 11-tooth cog and putting a spacer behind it. I know a lot of people resist this kind of change, but it's been working great for me.

The other issue that was only briefly touched on above is the problem of rim width with road tires. While 700c and 29er wheels have the same bead diameter, there is a limit to how wide a rim can be and still work with skinny tires. This limit is beyond what the typical charts you often see claim it is, but it's still there. I wouldn't try to run a 700x25 tire on a rim with a 21mm internal width.
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Old 04-27-16, 02:03 PM
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I have another question then: say I find a disc road wheel but the rear hub is 135mm QR. Can I convert it to a 142.5mm easily or do I need a entirely different hub?
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Old 04-27-16, 03:01 PM
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Originally Posted by ShadowGray View Post
From what I understand the rims between 700 and 29 are the same. So I would use 25/28c tires on this wheeset. Then I would get 35c CX tires for the stock wheelset, giving me two wheelsets to fast swap.

I'm more worried about cassette and brake rotor compatibility.
That rim has an internal width of 21mm. According to the current ETRTO chart (found here:Tire Dimensions | Schwalbe North America) the smallest tire you should use is 35mm. While to chart may be a little conservative, 25mm may be pushing it.
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Old 04-27-16, 03:30 PM
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I have 29'er wheels on my CX bike. They work fine. I'm running 40mm tires on there, so a MTB wheel is appropriate. If I was going to use smaller tires, I would think about it.

Originally Posted by ShadowGray View Post
I have another question then: say I find a disc road wheel but the rear hub is 135mm QR. Can I convert it to a 142.5mm easily or do I need a entirely different hub?
some hubs have conversion caps to convert, but usually it isn't cheap. Best to buy what you need up front. I had a set of wheels that would convert, but it would have cost me over $100 to convert both wheels to through axle. So they are staying on the bike with QR's
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Old 09-15-18, 02:41 AM
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This is good info! I'm going to try this!
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Old 09-16-18, 01:43 PM
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Originally Posted by Andy_K View Post
I've been running an 11-speed road cassette on a 10-speed MTB hub by removing the 11-tooth cog and putting a spacer behind it. I know a lot of people resist this kind of change, but it's been working great for me.
I may be missing something here. If you take out the 11t cog, isnít it now a 10 speed cassette?
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Old 09-16-18, 03:11 PM
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Originally Posted by Kapusta View Post
I may be missing something here. If you take out the 11t cog, isn’t it now a 10 speed cassette?
The cassette will have 10 gears, but the key for compatibility is the spacing between the cogs. And the cassette will still have the narrower spacing between cogs, so it will work with 11-speed shifters.

However, there may be an easier, non-hack way to use an 11-speed drivetrain on this wheelset.
I've heard that Shimano is making an 11-34 11-speed cassette that fits on a 10-speed cassette. This works because the last gear "overhangs" the spokes a bit, which is doable because it is far enough away from the hub. I haven't looked into this because I don't have anything 11-speed, but I like the idea.

If you want to use a 10-speed cassette with an 11-speed drivetrain, and want a wide gearing range, this looks like a good way to go.
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