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All of that ^ really. Stans are probably the best lightweight option.
My suggestion was for 5700 as they're stiff, black, external BB, not too heavy and not too expensive. So basically the best around 'perfomance' choice. Equally the Alfines would probably do everything you need.
Pretty sure the last gen Sram red plus something like one of those Thorn rings will be your lightest non-botique crank option though. But as I said if you want to go down the ww path you need to start listing weights next to things.
I don't really understand why you'd choose Omnoms based on your brief. They seem like an expensive compromise.
hugo7-
OK, been digging around and I think Shimano 5700 with a Thorn ring and Ultegra BB might be the best bang for the buck. Should work out a little lighter than the Omnoms and about £40 cheaper. Alfines are cheaper but at least 100g heavier (not sure whether the listed weight includes the BB).
Had a look for some SRAM cranks but even second hand they seem hideously expensive...
Now looking at rims and adding these to a spreadsheet with listed weights, etc.
If I order everything for the wheel build, does anyone know of a place I can get them built for me? I'm in SW London innit.
Cheers all.
monkeydan
I think the road chainset was the most economic way of getting a modern chainset on a track bike. Fitted with one of these you are looking at about £100 for the lot, compared to the £170 for omnoms.
Alfine chainset is also a good bet because it's stupendously cheap and you get a chainring and bashguard thrown in too. Technologically it's pretty much the same as the omnoms, i.e. forged arms, hollow axle, external BB.
If you want light rims check out Stan's, maybe Alphas or Grail.