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, 2016 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, 2016 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, 2016 at 17:43

1 Answer 1


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, 2016 at 18:09

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.