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Old 05-02-12, 06:08 PM   #1
Chief Brody
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Road Wheelset - Rim Width

I am considering picking up a second wheelset for my cross bike so that I can have a road specific wheelset for training rides with my roadie friends. It got me wondering...

My bike is currently set up with 23mm wide rims. If I do pick up a second wheelset, do I need to be that concerned about the rim width? If I go with a narrower rim, am I going to have any issues with my brakes? Will they require any adjustments?
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Old 05-02-12, 06:52 PM   #2
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I would stay with the same rim. You would need to adjust the brakes if the rim is narrower.

I use any size tire from 700x23 to 700x38 with my Velocity A23 rims. I see no need for something wider or narrower.
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Old 05-02-12, 07:38 PM   #3
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There's a handy chart here: http://www.schwalbetires.com/tech_info/tire_dimensions

I'm not sure if your 23 mm rims are the interior or the exterior measurement. If it's the interior measurement, then skinny road tires are probably not a good idea with this rim.
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Old 05-03-12, 04:36 AM   #4
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Just use a wider road rim, like an A23 or Major Tom.
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Old 05-03-12, 05:10 AM   #5
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Quote:
Originally Posted by Barrettscv View Post
I would stay with the same rim. You would need to adjust the brakes if the rim is narrower.

I use any size tire from 700x23 to 700x38 with my Velocity A23 rims. I see no need for something wider or narrower.
+1

Yes, you will need to adjust your brakes each time you swap your wheels if you use a different width rim. No you don't want to have to do this. Make sure the outside width is the same. The inside measurement doesn't really matter.
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Old 05-03-12, 09:31 AM   #6
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Thanks guys...I think I'll shoot for A23s laced to 105 hubs.
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Old 05-12-12, 02:51 AM   #7
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Originally Posted by eddubal View Post
+1

Yes, you will need to adjust your brakes each time you swap your wheels if you use a different width rim. No you don't want to have to do this. Make sure the outside width is the same. The inside measurement doesn't really matter.
I use both standard width road rims (19?) and the wider 23s for XC but, I use one setup at a time and only the wider for my touring setup or 37 to 43 tires for heavy terrain. I would not recommend using anything less than 25s or 28s on the wider rims. If you are using 23s on the wider rims you are taking a chance as the bead is not riding at the optimal angle and if it comes off on a descent in a corner you might lose a little skin. JOMO.
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Old 05-15-12, 06:22 AM   #8
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I use both standard width road rims (19?) and the wider 23s for XC but, I use one setup at a time and only the wider for my touring setup or 37 to 43 tires for heavy terrain. I would not recommend using anything less than 25s or 28s on the wider rims. If you are using 23s on the wider rims you are taking a chance as the bead is not riding at the optimal angle and if it comes off on a descent in a corner you might lose a little skin. JOMO.
If you lost a bead in a corner and hit the deck, my sympathies. However, losing a bead in a corner usually isn't because of using a 23mm tire with a 23mm rim. The use of this tire/rim combination has been well documented, and is all over the web from respected sites such as Velo news (Lennard Zinn) and Bikerumor.com (Nick Burklow). It might distort the profile of the tire slightly, but because tires are flexible and the pressure that a tire of this size is safely run at, the tube will push the bead into the hook of the rim at it's natural angle as long as the difference isn't too great and the bead is seated properly. Since tires smaller than 23mm are rarely (if ever) used these days, this distortion is minimal.

Losing a bead in a corner is more likely from running too low a pressure in hard cornering situations. Slow leaks, hitting a small sharp pebble as well as failing to check that your tires are at proper pressure before a ride can all cause this situation. It's been seen on cross bikes while running very low pressures, but rarely if ever when running a correctly installed road wheel/tire at correct pressures. You can also do this by failing to seat the bead properly (no matter the tire/rim size) or if the bead is defective. There are too many variables to generalize that running a 23/23 combination is a bad thing.

If the OP wants to use road specific tires that are basically the same width of the rim, it's up to him/her and has been shown many times to be at least as safe as any other aspect of cycling. There is also an aero advantage to using similar tire and rim sizes, but that's a discussion for another day.
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Old 05-15-12, 12:26 PM   #9
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I prefer wider rims even for road riding. I have a cheap pair of Alex Ace-19 rims. that came with my tricross and although they are heavy (2000 gr+) they handle great. I am preparing to upgrade to a lighter weight rim and am considering the American Classic Hurricane or possibly building up a set of A23s.

In my research I found and article which compares the standard rim wheel to the wider rim. In this case, the AM Hurricane:
http://glorycycles.blogspot.com/2009...ne-review.html


"The rounder tire offers a better road feel and improved handling because of the rounded shape much like a tubular. I have tried running the Hurricanes with 110psi not the usual 120 I always run and have found it to be fantastic. No pinch flats and some smooth fast sensations on bricks and smooth roads."
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Old 05-15-12, 12:45 PM   #10
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Put Riv-bike's Jack Brown 33.3 wide tires on my Pinarello CX bike ..
its a nice ride.. should be OK with your 23 wide rims..
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