Tyre sizes

Discussion in 'Bicycle Mechanics and Repairs' started by Dave5N, 27 Apr 2008.

  1. Dave5N

    Dave5N Über Member

    Could someone please directme to a chart of absolute tyre sizes? Eg, what is the inflated circumference of a 700x23 tyre?

    Google has failed me!
  2. OP

    Dave5N Über Member

    Think I have worked it out now - the tyre size plus twice the width?
  3. feckless

    feckless Über Member

    Not all that close
    Unsurprisingly, Sheldon has a moderately definitive article on tyre sizing.


    Doesn't contain anything about the rolling diameters, though I'm not sure you could have a definitive rolling diameter for any size of tyre as it'll vary according to make.

  4. hubgearfreak

    hubgearfreak Über Member

    yes. 622 + (2x23) = 668

    but as feckless says, it'd depend on the make, so whilst the above will be close, is close, close enough?
  5. OP

    Dave5N Über Member

    That's the problem. AT the moment I am not quite inside three centimetres. ;) Not a lot of leeway.
  6. hubgearfreak

    hubgearfreak Über Member

    i don't understand, sorry:wacko:
  7. Jacomus-rides-Gen

    Jacomus-rides-Gen New Member

    Guildford / London
    Why dont you just put a spot of ink on the trye, roll it one revolution and then measure the distance between the two spots of ink??

    Best to do this on the kitchen floor when the missus is out and have the ink wiped off before she returns.
  8. Saddle bum

    Saddle bum Über Member

    You have to take account of the fact the tyre goes down a bit when you ride it, under the weight of the rider.
  9. briank

    briank New Member

    So you sit on the bike, one hand on the worktop/wall, and roll forward one turn of the wheel.
  10. OP

    Dave5N Über Member

    I was trying to get as close to gear restriction as possible. Short of buying rings and sprockets in diffferent sizes and trying them, I was doing the maths first to see what would work.
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