'Total width' is the width of the unmounted tire carcass, laid flat.
Fascinating how a small difference in tire width is carcass between the Michelin and Continental 25c tires is amplified by the 23 mm rim.
I'm basically running on 28 mm tires.
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And these are the reasons why tyres are often not the width as stated on their sidewall:
Standard tire widths are calculated using fairly wide, standard rims. Yet in practice, narrower rims are used more often, which in turn leads to tires becoming slightly narrower as well.
In order to ensure that tires have sufficient frame clearance, tire
manufacturers generally prefer to keep production closer to the lower end of the permitted tolerance (+/- 3 mm).
Carcass casing materials have become more and more sophisticated over time, that reduces the tire widening after the fitting. In order to correct this tire widening, over the past few years slightly wider carcasses have been used, so that the actual widths are now much closer to the standard widths.
From the Schwalbe north America webite, address above.
Manufacturers generally quote the overall brake track width on their wheels, but you really ought to be measuring the width where the bead actually lies to give more accurate data.
imho, 23c tyres are the idea aero solution for the wider style rims, and generally anything above or below are not as optimal. But going wider to 25c is ok depending on the road surface requirements.
I also believe that the older narrowers rims are at their ideal aero solution with 20mm tyres. And should probably still be the rim/tyre combo choice for track or even crit racers (as road condition is usually pretty close to perfect or is perfect).
But the 20c fad is being phased out somewhat now, because many many people where already using a 23c tyre on a rim optimised for 20c. And it is a no brainer that the 23c tyre matches up to the 23 wide rim
The new wide rim designs are as aero (or more aero depending on wind conditions) as the old 20c tyre/20mm brake track rim ideals. It will just take time for the whole bike industry to move to it solidly.
Their will still be a niece market for 20mm wide rim and tyres, but it won't be the mainstay within a few years I reckon.
(note '23 wide rim' refers to most wide rim aero designs. Some are wider already by the brake track, and even more wider further from the track. Just trying to keep the info somewhat joined properly)
Schwalbe One tubeless 700x23 measures 26.2 at 75psi on Belgium Plus, IRC Prolite Tubeless 700x25 measures 28 at 75psi.
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