Will the kenda K161 cyclocross tires (27x1 3/8s) fit on a 27x1 1/4 rim?

I havent been successful at finding this question on here or on google, apologies if it has been asked a million times.


  • I'd have thought you'll be fine with the tyre fitting the rim, there's usually some leeway there, but also make sure about brake clearance.
    – PeteH
    Commented Oct 6, 2014 at 8:41
  • Back when I was running 27" tires it was common to swap tire widths, within reason, and I don't recall anyone ever having problems. According to Sheldon, all 27" tires should be 630 rims. Commented Oct 6, 2014 at 11:48
  • I have done it .. It seems to work. The bike shop warned me that putting a 1-3/8 tire on a 1-1/4 rim could cause the the bicycle to topple ..
    – user14443
    Commented Nov 15, 2014 at 3:44
  • Hi @Austin, does the tire fit? I want to buy a pair of Kenda K161 for my 27 1 1/4 rims because the roads get slippery during the winter.
    – azer89
    Commented Nov 25, 2014 at 21:08

1 Answer 1


You can confirm tyre fit using the ETRTO spec, which should be specified on the sidewalls of your Kendas and the tyres that were previously fitted.

the format is


where ww is the nominal tyre width (often measured at the widest point when fitted to the manufacturer's test rim, rather than at the tread) in millimetres, and ddd is the bead diameter in .

I would expect a 27 x 1 1/4" tyre to be specified 28-630.

According to Sheldon, there is no other standard bead diameter using 27" as its nominal measurement, so any "27" tyre is likely to have a 630mm bead. 1 3/8" is equivalent to 35mm.

I have not previously encountered any cyclists using 27" wheels for cyclocross. I assumed "700c"/622mm to be panacea for all but the shortest of CX competitors.

  • 1
    These are commuter-cross tires, which is probably why they're still available for 27" rims (for the commuter part).
    – Batman
    Commented Oct 6, 2014 at 13:14
  • Ah, seems the Cyclocross angle was indeed a red herring; Austin previously asked a question about a Sekai 2000 in which he mentioned its 28-630 tyres.
    – Emyr
    Commented Oct 6, 2014 at 14:10
  • Also 27" is slightly bigger than 700c - a smaller rider would likely want 650b.
    – Batman
    Commented Oct 6, 2014 at 17:10
  • I haven't seen a 650B CX bike yet; the non-700c riders I hinted at would be more likely using 650c or 26" (559mm) depending on their background.
    – Emyr
    Commented Oct 6, 2014 at 17:13

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