Sundig SC-548C

Discussion in 'Bicycle Mechanics and Repairs' started by mints, 14 Aug 2012.

  1. mints

    mints New Member

    I have just joined and my have posted the following question in the wrong place so if you see it in beginners I am sorry.

    My computer instructions do not give my tyre size to set the CIRC number to, my tyre is 700 x 45c can anyone please advice.
  2. Cycle computers are normally set up using the distance the wheel rolls ( the wheel circumference);
    with the help of a friend sit on the bike with the valve at the bottom
    with a piece of chalk get a friend to mark the position of the valve on the ground
    roll the bike forward; whilst, sitting on it and when the valve is back at the bottom get the friend to mark the ground with the chalk again
    measure the distance between the marks and you probably can enter this figure as the CIRC number into your computer.
  3. OP

    mints New Member

    Thank you ArDee, my leaflet givesTyre size then a CIRC number ie 700x20mm 2074, 700x38mm 2180.
    My tyre states on it 700x45c.
    If I follow your suggestion what unit of measurement should I use to measure the distance between marks.
  4. accountantpete

    accountantpete Legendary Member

  5. OP

    mints New Member

    Thanks to all I now have the unit fitted and working well.
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