Re: [CR]Concave Query

(Example: Framebuilders:Jack Taylor)

To: classicrendezvous@bikelist.org
Date: Fri, 5 Jan 2001 21:09:43 +0000
Subject: Re: [CR]Concave Query
From: "Steven m Johnson" <grisha2@juno.com>


On 4 Jan 2001 19:53:02 -0800 karlnbev@internetcds.com writes:
> I picked up an old Wienman concave rim from a bike shop today, 36
> hole of
> course. The shop owner didn't know what it was, except that it was
> "an old 36".
> I noticed that the rim has virtually no "hook" to it and in the dim
> recesses of my middle aged brain, I seem to remember that there may
> be a
> problem with mounting certain tires on non hooked rims, but I can't
> quite remember specifics.

I am on my third fixed gear wheel built with a concave, have six more rims to go and have been real happy with them. They are all the 20mm width. On this last one I mounted a Specialized Turbo 700x26 on it. I have ridden it several miles, and there is a flat spot from the tire on sitting on the rim evenly. This is the first time that I had that problem with concaves.

Last summer there was a thread on the Tandem Hobbes list about these tires blowing off the new Santanas they came on. My calipers measure the tire as 29mm, and I don't ride the bike too far from home.

Just a combination of rim and tire you might want to avoid.

I eat rear wheels, I am lucky to get two seasons out of one. Concaves really hold up. The Mavic CXP22?, that came on my Bianchi Pista took a good hit on a railroad track last summer with no damage to the rim, but I have broken four spokes since. I am tempted to rebuild the wheel with DT 14 ga spokes. when the CXP is destroyed, it will be replaced with a concave.

Steven M. Johnson, Chesapeake, VA http://members.home.com/grisha1/index.htm

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