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Correct Tube?

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Correct Tube?

Old 03-26-20, 03:25 PM
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Correct Tube?

I have WTB 21-622 27mm Aluminum Allow Trail 29 rims on an Urban Globe Specialized bicycle. I needed the beefed up rim because of my weight. I'm rough on rims. I need to replace the tire....Doing it myself because shops are all closed and damaged my tire on my last ride. I'm getting from Specialized website Infinity Armadillo Reflect 700-35 tires. What is the proper size tube for them? 700 x 32-50c or 29 x1.75-2.4?


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Old 03-26-20, 03:59 PM
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A 35mm tire is about a 1.4" equivalent. (25.4mm=1")
Look for a tube where 35 is the middle of the range like a 32-35-37.
You probably can't narrow it down that fine, but you get the idea.
Undersize tubes will stretch, but they'll get thinner. No guarantee some spots don't get thinner than others. having a tube that stretches "just a bit" to fill the tire when inflated is easier to install than an overly large tube.
You aren't committed to a 35mm tire. You could go slightly larger/smaller if you desire. If your 27mm rim is outside measurement, I wouldn't go smaller than a 32. I like at least a couple mm of rubber protecting the rim when accidentally "merging" with a curb.
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