Old 05-21-13 | 08:23 PM
  #14  
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oldbobcat
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Joined: Jul 2005
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From: Boulder County, CO

Bikes: '80 Masi Gran Criterium, '12 Trek Madone, early '60s Frejus track

When tread becomes too thin to keep pointy objects from penetrating the tube.

When the flat part ripples when I deflate the tire.
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