Quote:
Originally Posted by Red
Dumb question of the day.
I have a bike with a 700-25 tire.
The inner rim says 700-16mm
I used some 18-23 tubes last year but kept getting flats. Bad luck? Possible. Inspected the inner tire and rim and nothing jumps out. Is the 18-23 tube too skinny and I should be getting a 25 tube?
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I've used undersized tubes before... ie 18-23mm tube on a 25 and even 28mm tire. It just stretches the rubber beyond what the manufacturer says is the sweet spot and so it might fail.
As for too many flats... you gotta look at other factors primarily your tire choice and pressure and where and how you ride.
Typically the rim inside width is less than the tire width, although over the past couple of years with all the marginal aero gains and tubeless stuff we are seeing wider rim widths on both road and mtb.