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basic tube info(3 posts)

basic tube infobm
Sep 2, 2002 4:56 PM
i'd hate to look it up in a book . .

somebody please give me basic info on package details for clincher tubes. i know what the 700 means but whats 700 x 25/28 c ? what's the ultralight version for - racing?

(c = clincher?)

what do i look for when buying deep dish tubes?

thanks
re: basic tube infoabicirider
Sep 2, 2002 5:10 PM
the "C" = Clincher the 25/28 is the width common clincher widths 20c 23c 25c. I gather by deep dish you are refering to deep profile rims you want a 60mm stem that will get you by most of the time without having a valve extender.

Hope this helps:
Ray Still
Mooresville, NC
I think...jose_Tex_mex
Sep 2, 2002 5:14 PM
The 700 part has to do with the diameter of the rim. The standard for road biking being the 700 "c".

Yes, there's 700a's, 700b's, and so forth. I am not 100% as to their rationale, something to do with the rim diameter or width again. Don't worry about it, just stick with the 700c's.

The next number can be 18 - 25 and has to do with the width of the tire. 18 is a bit thin for my taste. For training I use 23's and a lot of people use a 25. If you are new I would go for the 23's. Thus, your tire would be a 700c x 23. However, the tubes will fit a range of tires such as 700c x 18-25.

Finally, if you have deep dished rims like Shimano 535's, Zipps, or the like you will have to get an extended presta valve or long presta valve in order to make pumping easier. Some rims can take the smaller valves but it can be a real hassle trying to get the nozzle over the valve.

Ultralights are for freaks who think it's a good idea to skimp on tubes :-) I don't like flats so a gram here doesn't bother me.