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Michelin A1 Tubes - what's with the stem?(5 posts)

Michelin A1 Tubes - what's with the stem?PdxMark
Feb 7, 2002 9:15 AM
OK. Traditional Presta stem is threaded over it's entire length, in part (or solely?) to accommodate a nut. It also seems that the threads helped pumps form a seal with the stem.

The Michelin A1 tube stems have only a short threaded section, for the valve cap, and are otherwise smooth as a baby's fanny. Makes it hard for my pump to form a good seal. Is there a benefit for this smooth stem, other than reduced manuf. costs (no thread to cut)? What other tubes are folks using?
re: Michelin A1 Tubes - what's with the stem?LC
Feb 7, 2002 9:51 AM
It does not wear out your pump head as much.
re: Michelin A1 Tubes - what's with the stem?DINOSAUR
Feb 7, 2002 10:39 AM
Valve stem nuts are virtually useless and end up being disgarded. Perhaps Michelin just elimated that process from their manufacturing system to cut cost on both ends...I've never noticed a problem with the A1's forming a good seal using any type of pump or co2. What type of pump are you using? Does it have a thumblock that locks the valve chuck to the stem?
a blackburn floor pump (w/ new seal) has the problem [nm]PdxMark
Feb 7, 2002 10:46 AM
A1: I use 'em all the time- never had a prob. filling them...Crankist
Feb 7, 2002 3:51 PM
...just a problem keeping them full. They flat easily.