HLaB said:This Guide by Sheldon Brown may help.
I take it you added the latter bit after lee's answer; your tyres are 700mm diameter and 45mm wide that the important bit, 60 TPI just refers to the Threads per inch SheldonNorry1 said:Ummm - I've read it, and I don't think I'm a total cretin (half maybe) but I couldn't really follow it.
My bike has rims described as:
Alex Crosstrail, 700c, alloy double wall w/ machine sidewalls, 32h
and tyres described as:
Specialized Borough XC Sport 700x45c, 60TPI, wire bead
What does all that mean?
Martin
and the wire bead is just there's a wire bead around the rim of the tyre as simple as that. Some lighter and more expensive tyres don't have a wire but its not really important IMO.The higher the TPI number, the thinner and more flexible the tire fabric is. Thin-wall (high TPI) tires tend to be lighter and have lower rolling resistance, but they're more easily damaged by road hazards.