Thread: What size tire should I use
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Old 09-19-14 | 02:01 PM
  #3  
dabac
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Joined: Mar 2008
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27 x 1 1/4" is a bead seat diameter of 630 mm.
There IS a 635, but that's considerably wider.
I'm guessing you need a ETRTO 630 mm tire, and that someone, once at a time, used a fairly stretchy rim tape on your wheel.
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