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Old 10-29-10, 04:24 AM   #1
Sundance89
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Tubes a size too small . . . No harm No foul?

I recently got a new wheelset and needed some long stem tubes. It was late and my LBS was closed and I wanted to ride in the morning so I went to REI. I'm running Ultra Gatorskins (28's). Rei was out of tube sizes 700 x 26-32, so I got 700 x 20-25.

Even though it has worked so far, what's the downside of this? Am I at slightly more risk for a blow out since the tube is stretched thinner? I'm also in some extreme temps in Arizona, so road surface temps can be off the charts.

All I can think about are those poor SUV's flipping over from blowouts with Firestone tires some years ago. (Although after reading the reviews about Novara tubes, maybe I should just be worried about poor quality.)
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Old 10-29-10, 04:56 AM   #2
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Originally Posted by Sundance89 View Post
I'm running Ultra Gatorskins (28's). Rei was out of tube sizes 700 x 26-32, so I got 700 x 20-25.

Even though it has worked so far, what's the downside of this? Am I at slightly more risk for a blow out since the tube is stretched thinner?
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Old 10-29-10, 05:20 AM   #3
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i was taught to ALWAYS go with the smaller tube size so that is all i've ever used. in fact i've got the same size tube in a 700x35 tire right now. no issues
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Old 10-29-10, 05:38 AM   #4
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Not a problem. Remember the tube is captured by the tire, so it can only stretch so far.
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Old 10-29-10, 06:53 AM   #5
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No Problem!
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Old 10-29-10, 07:39 AM   #6
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Appreciate it. It's the little things sometimes.
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Old 10-29-10, 10:30 AM   #7
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I once paid $0.20 extra for a 26x2.25-2.4 tube over the 26x1.95-2.1 tube. When I looked at it, it actually had 26x1.95-2.1 molded into it with 26x2.25-2.4 stamped over that. I guess the manufacturer doesn't think it matters either.

Running a smaller tube is fine. The spare tubes I carry are the smaller size and I frequently just leave them in there. I've never had a flat due to too small a tube.
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