TPI casing number
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  1. #1
    bike guy extraordinare
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    TPI casing number

    what does the TPI casing number mean as it pertains to the tire

  2. #2

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    Higher number (supposed to) equal greater flexibility

    It's threads per inch in the casing. Main difference is that a higher number, like 127, is supposed to give greater flexibility than a lower one, typically 66, so the tire conforms better to irregularities on the surface. Probably it does, but I've never been convinced I can feel it when it has 105 psi of air inside.

  3. #3
    RoadBikeReview Member
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    Unless they cheat

    Some manufacturers have been known to quote utterly bogus TPI numbers buy counting all the threads that you "see" as you look through the casing. The fabric of the casing might have 60 threads per inch, but since it is tripled under the tread, we're going to call that 180 TPI. Looks so much better in the marketing brouchure, don't you know. In general a higher TPI is better, if the numbers are measured the same.

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