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Vintage 27" tire width?

Old 07-18-19, 08:30 AM
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riverdrifter
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Vintage 27" tire width?

I'm still confused about tire and wheel widths.

The 1984 Trek 620 came equipped with 27" wheels and 1 1/4" wide tires. 1.25 inches converts to 31.75 mm.

So if you set that vintage wheel next to a modern 700c road wheel with a 32mm tire mounted, would they be pretty close to the same width?

Thanks!
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Old 07-18-19, 08:31 AM
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Yes.
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Old 07-18-19, 09:30 AM
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Originally Posted by ksryder View Post
Yes.
Thanks!
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Old 07-18-19, 10:16 AM
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Yes, some tire sizes are indicated using fractions of inches, some with decimal fractions of inches, and some in millimeters.
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Old 07-18-19, 02:10 PM
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Note that not all tires run true to their label or callout sizes. Continentals I have owned run small (700Cx28 being closer to 25 or 26mm), whereas Specialized have run full or even a bit larger (same 700Cx28, more like 29 or even 30mm wide). Mounted tire width is also affected by rim width, but, yes, 700Cx25 should be about as wide as 27 x 1", 700Cx28 should correspond to 27 x 1-1/8", and 700Cx32 should come in around as wide as 27x1-1/4".
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Old 07-18-19, 04:52 PM
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Roughly.

And 27 x 1 3/4 is *about* 35mm.

Close enough for government work.
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Old 07-18-19, 05:10 PM
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John E. brings up an important point, as you also may want to investigate as to which tire brands run more true to size and which do not(--run smaller width--)

Michelin Protek (32 x 630) 27" x 1 1/4 tire is probably among the wider ones, as most cheat.....
(This is a great tire, however it's weight in grams is among the heavier tires in that size..................)
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Old 07-18-19, 06:25 PM
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I have some Kenda knobby 27x1 3/8" that are barely 32 mm wide, even on a wide rim. Nashbar branded tires (from the pre-bankruptcy company), always were smaller than the stated size. 27x1 1/4 was 28 mm. 700x 35 mm was 32 mm. All the Pasela tires I have bought in 27 inch sizes were true to size.
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Old 07-19-19, 04:40 AM
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And tyres, like waistlines, tend to grow as they get older. Basically, the cords in the casing relax a bit and stretch.
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Old 07-19-19, 07:56 AM
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Originally Posted by The Golden Boy View Post
Roughly.

And 27 x 1 3/4 is *about* 35mm.

Close enough for government work.
No, you're thinking of 1-3/8
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Old 07-19-19, 03:40 PM
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Originally Posted by noglider View Post
No, you're thinking of 1-3/8
Yup! Sorry!

Numbers and me don't get along to goodly.
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