Thread: 27" to 700C Conversion Woes
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Old 02-28-13 | 01:11 PM
  #19  
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ThermionicScott
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Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)

I'm late to the thread, but if the 27" tires are older, they might have been made in a time when tires weren't as "honestly" sized as they are now: http://sheldonbrown.com/tire-sizing.html#dishonest
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