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Tester will say Wipperman 1R8 which is no lightweight.
KMC X101 is an option, still a proper (bushed) track chain but ¼lb lighter (112 links) than a 1R8, actually lighter and narrower than the 7R8 3/32" chain according to published numbers. I'll probably try one next time I change my chain. It is about 50% more expensive than the Wippermanns, but in weight weenie terms £10 for 100g is the bargain of the century :-)
Speaking of which, 1/8" chain recommendations?
The lighter the better. Doesn't need to be some over-engineered thing for sprinters as I'm piss weak.