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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 11-01-06, 08:44 AM   #1
Miles2go
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Rim width for 32s and beyond??

Sorry if this is a common question on this board.

I'm probably going to build up a cross frame for long distance commuting soon and I'm wondering about rim widths.

How narrow of a rim will work *well* with 32s? What about 35s? Along the same lines, what's the widest 700c tire to work well in a road racing wheel such as the Campy Nucleon wheelset?

Any other issues with narrow rims, such as limiting the brakes I can use?

Thanks
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Old 11-01-06, 09:14 AM   #2
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I'm using a 700x40 on the front on a standard FSA RD400 road rim and a 700x35 on the back on a CXP33. I've had no problems with either. Knocks on wood...sure as sh*t, I'll get a flat tonight...
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Old 11-01-06, 12:24 PM   #3
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Check out the ratio of tire to rim width on most MTB's. Way worse than any combination I could physically fit in my CX frame. I think ideally you would run a wider rim with wider tires, but you certainly don't have to.
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Old 11-01-06, 01:58 PM   #4
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I've run 28's and 35's on narrow rims and 32's and 38's on wider rims this year. The 700x35c IRC Mythos XC Slicks that are currently on my narrow Open Pros have a softer, squishier feel to them. I like that feeling in the rough stuff but I prefer to steer clear of it when carrying a load or taking hard corners on pavement. It feels like the tire is rolling out from under the rim and the squirm is unnerving if not outright dangerous. The 700x32c Randonneur Pros and 700x38c Ritchey Speedmax's on my 22mm wide Mavericks and CR18's have a much more stable, predictable feel to them with grocery bags in panniers or when riding with a slower roadie crowd. I guess it boils down to how you want the bike to handle.
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Old 11-01-06, 03:44 PM   #5
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If I recall correctly, the rule of thumb for "what tires will fit on this rim" is to measure the inside width and multiply by 1.4 for the narrowest tire that will work and 2.0 for the widest that will fit without major danger of rolling the tire off. I forget where I saw that, maybe on Sheldon Brown's site.

That's not to say you can't do otherwise, of course...
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Old 11-01-06, 04:48 PM   #6
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I have used 30's, and 34's on my MAvic open pro's. Techincally the Necleon's have a slightly wider rim than the open pro's so I think you're fine. I see a lot of guys with the open pro's at cross races so no worries.
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Old 11-02-06, 04:05 AM   #7
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Quote:
Originally Posted by alreadyblue
I have used 30's, and 34's on my MAvic open pro's. Techincally the Necleon's have a slightly wider rim than the open pro's so I think you're fine. I see a lot of guys with the open pro's at cross races so no worries.
I put a set of Specialized tires in 32 on my OPs. Most of the riding is on the road or in fields etc. They look huge on those rims. I always worried about problems. So far no problems. Actually they work very well. I am just too cheap to get new wheels though.

Tim
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