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Conference noted::bicycle

Title: Bicycling
Notice:Bicycling for Fun
Moderator:JAMIN::WASSER
Created:Mon Apr 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3214
Total number of notes:31946

287.0. "Wheels Wheels Wheels" by NAC::CAMPBELL () Mon Apr 27 1987 10:55

    
    I recently bought an "OLD" Raleigh Competition, and I'm about to
    buy new wheels for it. One problem..... I don't know what size
    wheels are on the bike now!! There are absolutly no markings related
    to size on either the tires or the rims. 
    
    My question is..... Where do you measure to see if they're 700 c's
    or 27"?????
    
    Also, can I put 700 c's on a that's got 27"s on it and vice-versa????
    Are there any advantages????
    
    Stew
    
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287.1I'll race anything British with wheels...WHOARU::GAVINMon Apr 27 1987 11:1223
    I have a c. 1978 vintage Raleigh Competition, and have enjoyed many
    racing and touring miles on it. You should have lots of good times
    with yours. Raleigh changed the Comp specs quite a bit from year
    to year, so it depends on which version you have. Mine is the last
    version before the Comp GS, and has Huret dropouts (the only feature
    I REALLY dislike). My bike came with Tubulars, but I have used both
    27" and 700C wheels with good results. I prefer the 700C, since
    the overall diameter and brake surface position are nearly the same
    as the tubulars I use for racing, so switching back and forth is
    easy. Quite wide 700C rims/tires will fit easily, but wide 27" tires
    get to be a tight fit. High performance tires and rims are also
    much more easily available for 700C.
    
    BTW: If the bike feels the least bit twitchy, have the frame alignment
    checked; the rear triangle on my frame was misaligned, and I was
    never really happy with the rear wheel alignment, and was always
    a little uncomfortable on the bike. We put it on Paul Randazzo's
    frame alignment table, and found the problem, which was easily fixed.
    This transformed the bike, completely eliminating the 'nervousness'
    and making almost regret buying my Ciocc.
    
    		- Bill
    
287.2TALLIS::JBELLWot's..Uh the Deal?Mon Apr 27 1987 14:3112
The easiest way to tell a 27" wheel from a 700c wheel would be to
borrow a tire of each size, and see which one fits.

A less empirical method is to measure the curcumference of the bead
seat.  The 27" rims should measure 1,978 mm.  700C rims should
measure 1,955 mm.

If you do find markings, remember that a 700C is the same as a
Brittish 28 x 1 5/8.

-Jeff Bell