What does TPI mean for tires?

[AdrianRose]

TPI=threads per inch, which refers to the number of fabric threads per inch, indicating the density of the fabric. A higher TPI count means lower rolling resistance. Most of a tire's rolling resistance is caused by rubber deformation. Since high-TPI casings contain less rubber, they can more efficiently convert the rider's energy into forward momentum. Tires are not entirely made of rubber; they have internal fibers as reinforcement materials. A higher TPI indicates more fibers per inch. A denser weave means finer fibers, requiring less rubber to fill the gaps; conversely, a less dense weave has thicker fibers and requires more rubber. TPI parameter: TPI is a density reference value. The higher the number, the thinner the tire sidewall, the more challenging the manufacturing process, the higher the material requirements, and the better the air retention.