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CX (700x35) tire fit on a CXP-33 rim?(9 posts)

CX (700x35) tire fit on a CXP-33 rim?asterisk
Jan 24, 2004 3:40 PM
Long time lurker, first time poster.

Background: I'm building up my first new road bike and, being a broke college student, I want a bike that will do both road and light cyclocross duty. It will mostly see long road rides but I eventually want to try a cross race or two. The frame is a Surly Cross-check.

I've decided on the Mavic CXP-33 w/ Ultegra hubs deal from Colorado Cyclist, as people have said they're a solid wheel. However now I'm wondering if the larger cyclocross tires will fit on these rims, ie 35, or am I stuck with 23-25s and that sort of regular road tire?

Would instead finding a wheel built with a MA3 or similar rim be better? Or am I crazy and it doesn't matter?

Thanks for any input!
Should not be a problemKerry Irons
Jan 24, 2004 5:59 PM
In this range of tires, you should not have a rim fit problem. Why not ask CC as a double check. It is possible to call them and talk to technically knowledgeable people.
I'd be surprised...lyleseven
Jan 24, 2004 7:54 PM
if a tire that large would be appropriate for a CXP-33. I would also check with CC.
www.sheldonbrown.comDave Hickey
Jan 25, 2004 7:29 AM
http://www.sheldonbrown.com/tire_sizing.html

Scroll down to the following. There is a chart that shows inside rim diameter and max tire width.

Width Considerations
Although you can use practically any tire/rim combination that shares the same bead seat diameter, it is unwise to use widely disparate sizes.
If you use a very narrow tire on a wide rim, you risk pinch flats and rim damage from road hazards.

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.

Georg Boeger has kindly provided a chart showing recommended width combinations:
From the Mavic web sites...TFerguson
Jan 25, 2004 11:22 AM
Their recommended tire for the CXP 33 is 19 - 25. BTW, the Open Pro is 18 - 23. In another place they give the recommended tire pressures for both rims for a 28.

I routinely run 700x32 on my OPs.

TF
Ditto!lyleseven
Jan 25, 2004 6:21 PM
For touring......
so...asterisk
Jan 25, 2004 8:32 PM
on re-evaluation... it wouldn't be unreasonable to at least fit an occasional 30 on one?
Tech guy at Surly told mepitt83
Jan 26, 2004 5:10 AM
Not to go below 21mm rim cross section. That meant MA3 or larger. I think the CXP's are 19mm and the open pro's 20mm.

He explained it like this: You can certainly force a tire to bead up on a skinny rim, but it would be more "U" shaped than "O" shaped. Compromises handling and stability.

He told me that since I was buying new to get an appropriate rim. I've got 31's on MA3's (21mm)and they handle fine.

I just built some Velocity Dyads which are a whopping 24mm cross section. I'm going to mount 40mm trail tires (WTB's) on those for spring off-roading. Should be fun.
OPs are slightly more narrow than CXP33s. (nm)TFerguson
Jan 26, 2004 12:12 PM