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Actual tire width vs sidewall label(6 posts)

Actual tire width vs sidewall labelSteeve
Jul 21, 2001 10:06 AM
I just measured the width of my Michelin Axial Pro tires with a dial caliper. Both tires were inflated to 110psi. The front tire actually measured 22.6mm (sidewall says 20) and the rear actually measured 24.6mm (sidewall says 23).

Has anyone else noticed that the actual size of thier tires were off by nearly 1 size? What brand were the tires?
re: Actual tire width vs sidewall labelJohnG
Jul 21, 2001 1:36 PM
Veloflex Pave 22: 22.3mm actual
Vred 23: 24.5mm actual
Very common--usually narrower than the labeled sizecory
Jul 21, 2001 6:04 PM
My axials are about the same size as yours (it'll vary a little depending on the rims). Normally, though, tires are narrower than their labeled sizes, often by quite a bit. The 35mm Pasela TGs on my Atlantis measure only 30.5, and the old ones, labeled 32mm, were really only a fraction over 25mm.
Sheldon BrownDog
Jul 22, 2001 11:55 AM
here's the deal:Rusty McNasty
Jul 23, 2001 4:11 AM
That 2-digit number is NOT a width measurement, but rather a profile height measurement. On a 20-profile tire, you have a diameter of (rim) 622mm + 2* 20mm (profile #) = 662mm. It is just coincidence that the width is usually about the same, but that varies due to construction of the tire. On ATB tires, however, the second # IS a width, and likewise with old 27" tire sizes.
Hey, cool, I didn't know that... (nm)cory
Jul 23, 2001 7:56 AM