Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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In borderline cases, I also prefer to use the smaller size for ease of installation.
Also note that tire and tube widths aren't ultra precise. What you might do is fill the tubes to the point that they fill out (aren't flat), but haven't stretched yet, and compare the unstretched width to the tire. If the unstretched width is too close to the tire's width it'll be hard to install without pinching.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance