Bicycle Mechanics - replacing tires?
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01-25-09, 09:29 PM
if i have 700 x 28c tires, can i replace them with 700 x 25c tires without having to get new tubes or wheels?
01-25-09, 09:34 PM
Wheels will be ok.
If you have large tubes as 28's to 35's, they might be to large.
Look at the tubes and see what size they are.
01-25-09, 09:47 PM
What sort of rim are you thinking to put the 25's on?
It shouldn't be a problem. If you're replacing the tyres because they're worn out, I always fit new tubes anyway, but only because they've aged and I've got the tyres off so it's easy to do it then - it's only only a paranoid preventative measure though, not necessary.
01-26-09, 09:41 AM
The size tire that can fit on a wheel is a result of rim width. Inner tubes stretch enough that it doesn't really matter.
01-26-09, 10:39 AM
I have some rims that I built (Mavic A719's) for my hybrid. The manufacturer states that 28C is the minimum size. Hence my above question.
01-26-09, 10:06 PM
well the tube says 700 x 28/32 and the rims are Weinmann CN-520s with inner width 19.6 so it looks like 25s would be too small acording to the sheldon brown chart
01-26-09, 10:14 PM
You might be able to do it. Even if the tubes are too large they will still fit with a tiny bit of work. The rim is a maybe depending on how it was constructed.
I personally would not reuse a tube when I can buy them for $2 each. www.pricepoint.com
01-26-09, 10:18 PM
Do try it. I noted a few problems with Sheldon's chart (I'm going to Hell now - I know it). I have 24.6mm rims. The chart says it can't take a 700 X 28c tire. The manufacturer says otherwise. I've been running 28's all year just great!
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