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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 12-12-07, 03:53 PM   #1
Geezer Clyde
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Wheel/Tire compatibility ??

I have a Specialized Sirrus that came with Alexrims AS-1 wheels; there is "ETRTD 622 x 16 6061HT6" on the rim in fine print. The tires that came with the bike are Specialized All Condition Pro, 700x28c, aramid bead, 120TPI w/ Armadillo Elite; recommended pressure for these are 75 - 100 psi and I have always kept them around 100. I have about 800 miles on those tires now with no flats or other problems.

As I am commuting in the dark with this bike, I decided to switch to the Armadillo tires with a reflector band on the sidewall. I purchased and installed a pair of the Armadillo elite 700x25c tires, which have a recommended pressure range of 115 - 125 psi.

The problem: I have now blown out 5 inner tubes trying to use these tires. I also watched the guys at the LBS blow one out. The symptom is always the same: the bead loosens up from the rim, a gap between tire and rim develops, and this exposes enough of the tube to let to a blow out. This is despite taking precautions when installing and inflating the tubes, like repeated inflation/deflation cycles, bead inspections, etc. The only riding I have done on these besides the test rides is a one-way (18 mi) commute to work today, and I came out after work to find one of them blown out.

My question: Is it possible that the tire and tube are not compatible? Has anyone else run in to a problem like this?

Any ideas would be appreciated.
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Old 12-12-07, 05:55 PM   #2
Gonzo Bob
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The tires may be too narrow for those rims. Or there could be rim or tire bead damage which prevents the bead from staying seated.
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Old 12-13-07, 01:27 PM   #3
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I asked this question (worded slightly differently) the other week and got some good responses.
I believe at least one of my blow outs was due to an old "stretched" tire. I did find that the inside of my rim had this rubbery deposit/grit from the previous tire. Cleaning this off seemed to make the rim "grippier" and I did not had a blow out on the mounting after cleaning. It could have had no effect but is easy to inspect and do.
good luck

PS at least with regard to sheldon those tires should fit your rim size wise.

Last edited by ericthered; 12-13-07 at 01:32 PM.
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