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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 06-17-12, 08:00 AM   #1
allroy71
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Widest tires on rim with 15mm inner width?

Sorry, I know there are various threads on this subject!

I have a set of Mavic rims with these stats:

ETRTO size: 622x15C
Recommended tyre sizes: 19 to 32 mm

Would anyone feel comfortable going up to 38s? And would they be difficult to mount?
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Old 06-17-12, 08:35 AM   #2
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Personally, I wouldn't go past 28, but 32 is pretty much the design limit for a 15mm rim. . I'm not sure there is enough clearance on your average run of the mill crossbike to handle past 35. . . if 38 is a must, then swap those for a 17mm rim. . or at least find a 29er type wheel with a tire similar to what you'd mount to see if it fit-- just to be sure.
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Old 06-17-12, 09:09 AM   #3
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Quote:
Originally Posted by allroy71 View Post
ETRTO size: 622x15C
Recommended tyre sizes: 19 to 32 mm

Would anyone feel comfortable going up to 38s? And would they be difficult to mount?
That's exactly what I have on the rear wheel of my touring bike at the moment. Works fine, handles well, and no problems mounting or unmounting. Just make sure there's enough clearance in the frame/fork/brakes. 38mm is right at the limit on my bike and it has caliper rim brakes that make it a little hard to get the wheel on or off with these tires fully inflated.
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Old 06-17-12, 11:22 AM   #4
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St. Sheldon's graph says 23-32 on 15's.
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Old 06-17-12, 11:34 AM   #5
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I raced on mavic rims with those same dimensions last year and ran 34mm wide tires (Hutch bulldogs). They worked alright. Occasionally after hitting tight corners (in dry conditions) I did find blades of grass between the bead and the rim. I suppose this may be an indication of tire rolling or deformation, but it never became an issue...probably because the bead was super tight on the rim.
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Old 06-17-12, 11:42 AM   #6
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Cross Courses predominantly soft turf and dirt @ what pressure?,
or this a commuter on street pavement, or?
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Old 06-17-12, 08:33 PM   #7
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@fietsbob This would be for mixed terrain riding, not racing. I had thought about getting 17mm width rims, but I guess I don't want any more parts laying around. I am currently running Speedmax tires that are supposed to be 35mm, but measure 32mm, which agrees with the Sheldon Brown chart. BTW, my rims are Mavic, rear Aksium and front Ksyrium.
I will likely try some 38mm in the future or try and find 35s that actually measure 35!!
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Old 06-17-12, 09:14 PM   #8
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Originally Posted by RGNY View Post
St. Sheldon's graph says 23-32 on 15's.
The graph is Georg Boeger's and Sheldon himself wrote that many cyclists exceed the recommended widths with no problems.

Hell, a lot of people used to run Open Pros on their 29er bikes. Not ideal, especially at lowest pressures, but it works fine.
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