Be careful with how manufacturers define TPI. Some refer to the number of threads in each ply (fabric layer), while others count all the threads in all the plys. For example, one manufacturers "180 TPI" tire might have two plies of with 180 thin threads per inch in each ply, while another manufacturer's "180 TPI" might have 3 plies with 60 thick threads per inch in each ply. The tire with two thin plies will be more pliant than the tire with 3 thick plies.MikeBiker said:Threads per inch.
It refers to the number of cord threads in under the rubber. The smaller the threads, the more TPI the tire has and the more the tire is pneumatic and is more 'round' and has better riding characteristics.
and usually the more expensive.John Nelson said:
Well, the tire manufacturers certainly want you to think high TPI is better! Hence the way some of them fudge the numbers for TPI (see message above).John Nelson said: