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700 X 28 dosen't fit....

Old 10-15-09, 08:24 PM
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WalksOn2Wheels
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700 X 28 dosen't fit....



After taking the rear on and off 4 times (put it on the wrong way twice) and ruining one tube, I discovered the 700X28 is JUST too tall to fit.

This is on an 87 Specialized Sierra. I'm asking here rather than in the mechanics section as I have a feeling people here have run into this problem more often, that is, trying to put larger tires on an older "race" bike to build it up as a city/commuter bike.

So my main question is will a 700X25 fit or am I just going to have to roll with the 23's?
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Old 10-15-09, 08:37 PM
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"if it doesn't fit, you have to ac-quit" (sorry, I couldn't help it)

According to Sheldon Brown's tire sizing chart, http://www.sheldonbrown.com/tire-sizing.html#width , there is only one instance that a 28 cannot fit an a 25 can. And if a 23 can fit (according to my experience, too) a 25 can also.

What rim are you working on?
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Old 10-15-09, 08:39 PM
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It may not help in your case, but I have found that the same tire could have a shallower profile on a wider rim. Tires also differ in their actual versus advertised size. For example, the 28c Conti All Seasons I have are about the same size as Michelin Pro Race in 25c.
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Old 10-15-09, 08:39 PM
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Unless you have very tight clearances, 25s should be okay. However, it depends on the 'actual width' of the tire you are mounting. Is your 28 a true 28mm when inflated on your particular rim? What rim is it, by the way? The wider it is, the wider the tire will measure.

As an example, I've got 25 Michelin Krylions on Open Pro rims, and they measure 27.5mm wide!
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Old 10-15-09, 09:03 PM
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Honestly, I'm not sure what rims I have. The front is what I assume to be stock and the rear is a Mavic rim (I forget the model) on a 105 hub. The width is ok, but the tire is too tall. I'm assuming these are probably 20 or 23 MM rims, but I don't have calipers to measure.

I think I'm going to just give the 25's a go, or if the price is right, just pick up some 23's and call it a day.
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Old 10-15-09, 09:47 PM
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I'd say something is wrong. If a 28 won't fit, a 25 is not likely to fit properly, either. They differ in diameter by only 3 mm (0.12"). That's only 0.060"/side and 0.12" diametrical clearance. That is not adequate clearance.

My guess - your "28 mm" is not truly 28 mm. Talke it back and get a better quality tire that measures true to size.

Last edited by Mike Mills; 10-15-09 at 11:43 PM.
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Old 10-15-09, 10:42 PM
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Hopefully the manager will be in tomorrow. He knows his stuff and will most likely be able to tell me if the particular tire I picked up is abnormally tall, etc.
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Old 10-16-09, 02:46 AM
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tire quality has nothing to do with how true to size a tire is.

QUOTE=Mike Mills;9866953]I'd say something is wrong. If a 28 won't fit, a 25 is not likely to fit properly, either. They differ in diameter by only 3 mm (0.12"). That's only 0.060"/side and 0.12" diametrical clearance. That is not adequate clearance.

My guess - your "28 mm" is not truly 28 mm. Talke it back and get a better quality tire that measures true to size.[/QUOTE]
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Old 10-16-09, 10:00 AM
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I've found 28 mm Gators show a different width on racing rims (Mavic MA40s) and touring/utility rims (Girders, I think made by Alex?). I agree, a rim that provides more width should also reduce the radius marginally. But just a little bit might help.

If you have long-slotted dropouts, you'll get the most radial clearance by sliding the wheel back in the dropout, as well.
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Old 10-16-09, 10:03 AM
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Originally Posted by WalksOn2Wheels View Post
Honestly, I'm not sure what rims I have. The front is what I assume to be stock and the rear is a Mavic rim (I forget the model) on a 105 hub. The width is ok, but the tire is too tall. I'm assuming these are probably 20 or 23 MM rims, but I don't have calipers to measure.

I think I'm going to just give the 25's a go, or if the price is right, just pick up some 23's and call it a day.
Another detail in rim width is that you have to measure the inner width of the beads, not the width across the braking surfaces. Narrow 14 mm racing rims are more common than touring or utility rims that will measure 18 to 24 mm. Americans like to buy "racing."
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Old 10-16-09, 10:37 AM
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[QUOTE=rtruectoc;9867572]tire quality has nothing to do with how true to size a tire is. [\QUOTE]


My experience apparently differs from yours. I will say it is no guarantee but variations tend to be greater in lower quality tires. I have a set of tires on now which I measured with my dial caliper. They are exactly 28 mm in the rear and 25 mm in the front.

I wil reiterate my more important point. There has to be adequate clearance between the tire and the frame. It sounds like he does not have that and it seems something is wrong.
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Old 10-16-09, 06:50 PM
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Depends upon the tire, too. On my steel Allez (short reach Ultegra calipers), a "700x28" Continental Supersport somethingorother works fine, with 2-3mm clearance between the tread and the brake arch, while a 700x28 Rivendell Ruffy Tuffy is a no-go. On the same set of wheels (DT RR1.1), the Conti is 24mm actual width, while the Riv is 27.4. I'm thinking you just got a tire that's actually a 28.
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Old 10-16-09, 07:53 PM
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Well, I ended up with some Specialized 700X25's. I should note that the 28's were Specialized as well.

The tire measures an actual 25mm across, and the 28 also seemed to measure about 25 across (I'm thinking fat tire on a skinny rim...). They fit in the frame and fork fine with plenty of clearance. The clearance on the rear brake is ok, but it just rubs the front brake assembly and only on one part of the rotation. With the brakes not set (no cables) it tends to rub on the arms pretty well, even to the point of stopping, but with the brake pads set by hand, just hovering over the rim as if the cables were installed, the tire has a very slight rub on the center of the brake assembly, but nothing that causes any significant drag. Just sanding the mold off of the center might do it.

I'm thinking of using some sort of wedge spacer on each side of the brake mount to angle the assembly upwards a bit.

Man, they REALLY intended this bike to use 23mm tires. Perhaps a wider rim would help? I was looking at some budget Sun wheels (M13 rim). Maybe those have a wider rim?
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Old 10-18-09, 04:54 PM
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Sorry to revive my own thread for selfish purposes, but does anyone have any ideas for me as far as mounting the front brake assembly? Anyone else ever run into this problem?
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Old 10-18-09, 06:39 PM
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What problem? Why is the front brake a problem?
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Old 10-18-09, 07:42 PM
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Please see post #13...
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