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Tire width equivalenices: 27" to 700c ?

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Tire width equivalenices: 27" to 700c ?

Old 05-30-19, 08:42 AM
  #26  
Phil_gretz
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Old 05-30-19, 03:39 PM
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Originally Posted by Road Fan View Post
Steve, isn't 27" a monniker for ERTRO 630? 8 mm more bead seat diameter than the 622 mm of ERTRO 700?
Yes. Typo. Sorry.
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Old 05-31-19, 10:41 AM
  #28  
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Originally Posted by JohnDThompson View Post
And so-called 27.5" are just 650B. What's wrong with people?

It would be so much easier if everybody used the ETRTO size designations.
Agreed. And I also have no idea why we never went metric. It's so insanely superior and easier to use...
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Old 06-01-19, 06:40 AM
  #29  
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Originally Posted by palincss View Post
Yes. Typo. Sorry.
's cool. But in this topic we really need to be accurate, you never know when someone will believe an accidental flub.
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Old 06-01-19, 06:48 AM
  #30  
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Originally Posted by ThermionicScott View Post
Was there ever a competing 27" decimal standard, though?
I don't know where it's confusing that 27" rims are equivalent to 630 rims in terms of bead seat diameter, as long as the inner rim wall designs will safely mount the same tire bead designs. I think the amazing thing is that a pair of totally modern 27 x 1 tires will perfectly fit a pair of 1952 steel Dunlop rims marked 27 x 1 perfectly, and will even hold the tire pressure rating of 90 psi. No hassling, no wrestling with mega-tire levers, just my old set of Eldi levers from 1969.

ERTRO or ISO didn't create new sizings in all cases. In most they identified new names within their naming convention, which tried to clarify all this "stuff." In this one there is zero competition.
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