Join Date: Aug 2005
Location: Nausea, New Hamster
Bikes: (see http://wildavis.smugmug.com/Bikes) Bianchi Veloce (2005), Nishiki Cascade (1992), Schwinn Super Sport (1983)
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One of the mechanics at my LBS (he's also a pro cyclocross racer), gave me the following advice (not just for mtbs but for road-bikes also):
For a given size of tyre, to go for the smallest tube possible in order to minimize weight, remember an ounce off the rim is worth at least two off the bike.