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Mixing tire sizes?(5 posts)

Mixing tire sizes?TomS
Oct 24, 2001 7:21 AM
Is there any major drawbacks to mixing tire sizes (700x23 and 700x25)? I did this accidentally the other day - I was in a hurry and grabbed a 700x25 by mistake, and I've been riding on it for a couple of days... I just noticed this morning that it was the wrong size - doh!

The wider tire is on the front, and it makes for a little softer ride; I'm into just longer recreational rides and commuting, no racing, so I'm not too worried about any marginal increase in rolling resistance. And since it's a bit more comfortable I was considering just leaving it on, I don't think I could really "return" it at this point anyway!

I just want to make sure I'm not setting myself up for anything potentially dangerous...
Common on mountain bikes, don't see how it could hurtcory
Oct 24, 2001 7:51 AM
That's done all the time on mountain bikes, where they run bigger tires in front for cushioning and grip. The difference between 23 and 25 is so tiny, and the labeling so imprecise anyway, that it's certainly a non-issue. I have some tires marked 25 that are quite a bit wider than others labeled 28 or 32, and my 700x35 Paselas are really only 30mm...don't worry about it.
That's what I thought too...TomS
Oct 24, 2001 8:38 AM
I have mixed widths on my mtn bike also; I guess I should probably put the wider tire on the rear wheel since it gets more wear. But then I'd loose the little extra cushioning on the front. Probably doesn't really matter!

The tires are both Conti Gatorskins, so the size measurements are consistent between them. The 700x25 is a little wider than the 700x23, but obviously not *that* much wider or I would have noticed when I picked them up, or at least when I put them on!
FWIWmuncher
Oct 24, 2001 7:54 AM
I run a 25 rear and a 23 front on my roadie. Just more confortable that way, and the tyres seem to wear more evenly. Could tell no difference in the handling, other than a more forgiving ride.
re: Mixing tire sizes?Max
Oct 24, 2001 9:57 AM
I've heard of using a more narrow tire on the front for aerodynamics, and a wider tire on the back for comfort and grip.