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Old 03-28-09, 12:01 PM   #1
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rim width

Sheldon sez this chart errs on the side of caution:

I've got a pair of 15mm rims (inner width), how tightly am I bound to 32mm tires? I had my heart set on 40s but...
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Old 03-28-09, 12:08 PM   #2
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You can always give it a try, I've greatly exceeded the chart in the past, but it seems to seriously distort the shape of the tire, and it can make cornering kinda fishy. 40's might be pushing it, but you can certainly try, it's not likely to be dangerous, just kinda odd.
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Old 03-28-09, 12:15 PM   #3
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My 18's came with 45's on them from the factory - sure sounds kind of similar.....

Currently, I'm riding 40's, and really like them a LOT!

I've also got a set of 37's (35), waiting in the wings, to try next.
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Old 03-28-09, 01:41 PM   #4
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Directly below the chart it says:

Note: This chart may err a bit on the side of caution. Many cyclists exceed the recommended widths with no problem.
EDIT- I have 15mm rims and I run 28mm tires. 40mm seems like you would be pushing it. But, really, what's the worst that happens? Oh yea:

If you use a very wide tire on a narrow rim, you risk sidewall or rim failure. This combination causes very sloppy handling at low speeds. Unfortunately, current mountain-bike fashion pushes the edge of this. In the interest of weight saving, most current mountain bikes have excessively narrow rims. Such narrow rims work very poorly with wide tires, unless the tires are overinflated...but that defeats the purpose of wide tires, and puts undue stress on the rim sidewalls.

Last edited by Tabor; 03-28-09 at 03:15 PM.
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Old 03-28-09, 02:57 PM   #5
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I ran 35s on 14 rims with no problems. Can't see why you couldn't do 40s on 18s.
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