I am looking for a tire that is actually 37-38 mm, and learning that there is some variety in reality. Suppose we start a thread for one another's reference in which we post our experience with stated vs. actual on our tires, and I.D. rim width and tire pressure such as the two I've tried so far, and will add more as I experiment with others:
Panracer SS+ stated 700/38. Actual 39.5, 25mm ID rims @ 40 psi.
Bontrager GR1 Comp stated 700/40. Actual 40mm, 25mm ID rims @ 40psi.
coming soon, Specialized Pathfinder and WTB Byway.
And, if anyone has a recommendation in that size, please let me know.
thanks. Comps were too knobby for the riding I do. Looking for something with a smooth center. Also, I've got some 21mm coming. I'll post those measurements, too.
Byway 700x40 are perfectly false to size and measure ~38mm at 30-40psi even on my ID 25mm hookless rims - and that's after 1500miles. They don't stretch much, but if you do pump them up to 60psi, they get close to 40mm - but why would you do that?
Looks like it would be a good tire for you. Like mine a lot after my GK slicks wore out after only 800 miles.
dcaguillard wrote:I And, if anyone has a recommendation in that size, please let me know. David
David, I have used 40c Conti Terraspeed and 38mm Maxis Ramblers in that size - both very good tires. Both measure ~38mm on a 22ID rim. Both are a good 2mm smaller than my 40mm tires.
chas wrote:I have used 40c Conti Terraspeed and 38mm Maxis Ramblers in that size - both very good tires. Both measure ~38mm on a 22ID rim. Both are a good 2mm smaller than my 40mm tires.
My 40 Terra Speeds have stretched out to 40.25 mm at the casing at 35 psi on 23 ID rims. I think there's just too many factors to makes a thread like this very useful.
Strange that Scwalbe markets the G-One that's mold-marked 40mm as a 38. On my wider rims they blew out to 41.5mm. Yet their 35mm measures a correct 36.5mm on a wider rim. That's a 5mm delta for a nominal 3mm spec. Ridiculous! I went to SOMA EX 38mm for equal flat protection and longer life. Why on earth would Schwalbe market a 40mm tire as a 38 except as a feeble attempt to fill an obvious gap?
Currently running a pair of WTB Resolute 42's on EASTON AR 24mm (id) rims: at 38psi, one stretches out at a measured 43.72mm while the other stretches out at 44.30mm.
