Originally Posted by
Sy Reene
Nashbar lite tubes going for $4.31 each with 20% site discount.. Though these are a whopping 83g -- unsure if this includes cap and stem nut.
If you want to go even lighter, the continental "supersonic" tubes are about 50g. I weighed them on my scale once, and they are roughly that weight, give or take a few grams.
They are not nearly as durable though, if you pinch them at all during installation they will leak.