Friday, September 19, 2008
Exploding Rims and Derailleur Hair
Yesterday this wheel came in on a mid-1990s Gary Fisher. The rider reported that it exploded AFTER he had completed a precipitous descent.
"I felt a thump-thump-thump and stopped, but the spokes were all tight, so I started up again. A minute later, BLAM, it blew," said the rider.
I'll guess it did.
He did not crash.
In case you don't know, this sort of failure started becoming common during the mountain bike boom. Powerful rim brakes in an abrasive environment wear away rim sidewalls probably ten times as fast as road rims used to wear.
Today my associate across the bench drew this piece of pubescent componentry on a vintage Columbia road bike. Sorry the pictures are fuzzy. So is the derailleur.