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Old 02-11-04, 04:02 PM   #1
patrickjoseph
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700x28c tire question

i just aquired an old Ross Signature with 700x28c tires (also listed as 28 x 1 5/8 x 1 1/8 on the tires).
the bike is in seriously amazing condition, except the tires have a ton of wear and are beginning to split.
i've been reading and rereading Sheldon Brown's articles on tire sizing, and my question is, what widths of tires can i put on my bike?
i don't know the size of the rim, and i don't have any way to measure it, unfortunately.
if i put a 700x23c tire on, would it just come loose?
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Old 02-11-04, 05:00 PM   #2
Gonzo Bob
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Can't tell from the info you've given. But I would guess that a bike with 700x28C tires would have 17mm (inside width) rims. You can go as narrow as 25mm on those. I once tried putting a 23mm tire on a 17mm rim and the tire bead would not seat properly and the tire blew off the rim when I pumped it up.
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Old 02-11-04, 05:02 PM   #3
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Depends on the type of bike this is. 700x23 is pretty narrow, usually suited to fast road bikes. If this bike has 700x28 tires, it sounds more like a touring road bike or hybrid. It also depends on your needs. Do you want to go to as narrow a tire as possible? If so, you could probably go down to a 700x25 and the bead will still catch the rim. But unless you want the reduced rolling resistance and added speed of that narrow a tire, I'd stick with one as close to the original as possible.
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Old 02-12-04, 09:14 AM   #4
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Get a pair of Rivendell RolyPoly 700x28. I have those on my bike and they are the best cornering tires I have ever ridden. http://www.rivbike.com/
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Old 02-12-04, 11:53 AM   #5
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Most sport bikes can atke 25-32mm tyres.
There is wide variation in what exactly a 28mm tyre is. Some are light and narrow, others are wide and tough.
If you pick a narrow brand (like Panaracer), then the 28 will fit, and be quite light/fast, but their 25mm may be on the small side for your rims. The only way to tell the real size is to compare it to your current width, by sight.
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Old 02-12-04, 06:57 PM   #6
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Go Back to Sheldon Brown's WEB site. There's a table there that gives the acceptable tire widths as a function of inside rim width. 700X28 fit fine on a 15 mm rim (my wife has that combination) which is a very common road-bike width.

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