25mm rim with a 25mm tyre clearances

  • Creator
    Topic
  • #26905
    pablo

    Hi all.

    I’m in the market for some new wheels and with the trend for wider being better I’m doing some research.
    I have a cannondale supersix evo 2015 which has really narrow chainstays at the back. I have 25mm conti gp4000s (actually measuring just over 26 with a verneir) on a 22.4mm (rs81 c24 rim). I have had no issues with about 3mm of clearance either side and about 3000 miles miles including a mountain trip on the frame.

    If i went to a 25mm rim with a 25mm tyre would the tyre come up wider than the 26mm I’m measuring at the moment?

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  • #889365
    0
    HalfWheeler

    This page will help;

    This page will help;

    https://www.schwalbe.com/gb/reifenmasse.html

     

    #889363
    0
    velochris

    It is the rims internal width
    It is the rims internal width that matters as thus dictates how much the tyre will “balloon”.

    For reference I had a h plus archetype 170mm internal. A 25mm Schwalbe measures 26mm with a vernier.

    Same tyre on Kinlin xr22t 19mm internal is 27.6mm.

    Finally, a 25mm GP4000 on Pacent Forza 20mm internal rim is 27.85mm.

    Hope that helps

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