Can I put "new" 27 and half inch tires on "old" 27 inch rims? Looking to save the trouble of finding out!

  • By "27 and half" I presume you mean "27 five" or "27.5", a size specific to mountain bikes, with an ISO rim diameter of 584. This is NOT the same as a "27 inch" tire, which has an ISO rim diameter of 630. Jul 4 '16 at 18:10
  • (The only tire that will fits a 27" rim is another 27" tire. This would be an "xx-630" ISO designation.) sheldonbrown.com/tire-sizing.html Jul 4 '16 at 18:13
  • Yes, I did mean 27.5 . Thanks especially to Dan H. and Sheldon B. The whole ISO rim diameter designation would seem to be next on the learning curve! Thanks again, great site! Jul 5 '16 at 17:43

Have not seen 27 x 1/2 tires before but the old 27 x 1 1/4 rim probably will not care if the width is greater. One question is whether the wider tire will clear your frame.

  • A 27 x 1/2 inch tire would be awfully narrow, don't you think? Jul 4 '16 at 18:09

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