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T.P.I.
From WikiPedalia
- Threads Per Inch, the pitch of a threaded fastener.
- Threads Per Inch of cloth. This is a common spec for tires. 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.
