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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 11-20-05, 01:48 AM   #1
Portlandonian
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Should I be worried about these rims?

Okay, I remember reading in a continental tire instruction thing that a certain kind of rim is dangerous and the tire can roll off if you have them at more than about 60 or 70psi. This was for the old type where the nipples came right up onto the rim, and the nipples would actually be touching the tube without rim tape. They are usually wider also. I can't really remember any more details than that but I think they were reffered to as well-base rims?

I think that these rims I just bidded on are those type so do I have anything to worry about using them with 700 X 23C tires at 120 psi?

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7197770486


PS: If I'm safe, they're mine!!
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Old 11-20-05, 02:09 AM   #2
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Almost certainly the caution was against running the pressure too high on non-hook bead rims. Hook bead rims will have a lip at the edge of the rim wall that will keep a tire with a bead from easily slipping off the rim.

Given the age and the seller's response to a question, I'm guessing these are not hook bead rims.
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Old 11-20-05, 02:32 AM   #3
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Thanks, I was also wondering if I have reason to retract my bid because he listed it as 700C. Don't the non hook-edge rims have a different letter after the 700? Or just no letter at all?
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Old 11-20-05, 03:26 AM   #4
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No, 700C is the standard wheel size these days.

It refers to the outside diameter of a wheel outfitted with a particular tire. A "700" rim with a size 700C tire would be 700mm across (pretty huge given that a 700C rim is only 622mm).

The tire sizes range from A (smallest) to D (largest). Thus a 700B wheel would actually have a larger rim but a smaller tire. Damn French.

Nowadays 700C refers to any wheel with a 622mm rim.

Last edited by bostontrevor; 11-20-05 at 10:19 AM.
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