Some advice and a lot of first-hand anecdotes and observations from someone who accidentally had a career in the bike business.
Friday, October 02, 2015
Another "Valley of Death" rim
This is a Bontrager AT550 hybrid rim, 622X20 mm. It has the troublesome Valley of Death, where inner tubes meet a premature end. The skinny rubber rim strip can slip aside, uncovering a tiny fang on a spoke nipple. The inflated tube distends down into that deep channel, stretching unevenly. Sometimes tubes fail just from that. In other cases, the thinned part in the channel is more vulnerable to chafe.
Throw in the life line!
Ordinary clothesline fills the ditch. You have to allow for the valve hole.
Then top it with rim tape.
This cumbersome process brought to you by The Bike Industry and the fine re-labelers at Trek.