I was under the impression that “28” on the wheels means I need a 28 inch tire. Can this work?

by NoReportPlz

3 Comments

  1. No, that won’t work. The tyre is a 700C tyre (known as 28″ in some parts of mainland Europe), but the wheel is an old school 28″ rim which is much larger (found on some old school English roadsters and classic Chinese copies). 

    My tip would be to ignore any inch measurements – they’re obsolete and not consistent and often overlap. You want the ISO measurement – your tyre is 37-622 and your rim is 22-635. The small number is the width (wider tyres are allowed on narrower rims to a degree) and the larger number is the bead seat diameter (this has to match exactly). There’s a 13mm in diameter difference between a 622 tyre and a 635 rim so it will not work.

  2. flimflam_machine on

    Unfortunately not. The relevant numbers are the 622 on the tyre and the 635 on the rim. These indicate the bead seat diameter in mm, which is effectively the diameter of the wheel. These need to match exactly for the tyre to fir the rim. 622 is a modern road bike standard size, 635 is an older (town-bike?) size that isn’t very common any more, although you can still find tyres in that size.

    The numbers that go with those (**37** x 622) and (**22** x 635) refer to the width of the tyre and rim respectively. These do need to be roughly compatible, see here for an explanation of all of this and why “28 inch” can mean several different things when it comes to bike tyres: https://sheldonbrown.com/tire-sizing.html 

     The tyres here should fit (UK supplier) https://www.sjscycles.co.uk/tyres-28-635/

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