Shimano Dura Ace FC7710 Cranks - What bottom bracket goes with them?

Google more and stop being gullible. You can also use road octalink BBs which are the right length instead of the track one. They will be (a) cheaper and (b) much better sealed than the track BB, and so much better suited for road use. Here's some info from the guru of bikeforums.net

[cite]11.4[/cite]
With the 7710 crankset, you can use

(a) Dura Ace 7701 octalink road bottom bracket (aka dual chainring Dura Ace road): Nicest bearings of the bunch, and perfect on the track. Doesn't have NJS rating if that matters. Lighter than the other two. If you get it wet, it needs to be opened fairly regularly and regreased. Needle bearings on the drive side and actual adjustability in case your bottom bracket shell width is off by a millimeter or two. Great for those who don't mind working on their bike just a bit, or for track.
(b) Ultegra 6501 Octalink (aka dual-chainring Ultegra road): This is the durability winner. Good seals, steel axle, steel housing. This bottom bracket is far and away the best for typical road fixie use, and it'll outlast the frame. Easy assembly (just screw in the drive side, tighten, then screw in the non-drive side and tighten -- no adjustment per se). The seals may create slight friction, but you'll never know it in use. Find it on eBay for $25-20 brand new -- can't beat the deal.
(c) Dura Ace 7710 track bottom bracket: Heaviest of the bunch (all steel, no aluminum). Pretty much the same as the Ultegra but with the seals removed so it spins a bit easier (but frankly not much). Except for the NJS seal there's not much reason to buy this one. Why pay 2-3 times what the Ultegra costs, and get lesser performance? It's one example of where NJS means that it got approved, not that it's the best alternative out there.

I have also heard that these cranks are not recommended for street fixed use because backpedalling can cause the spline interface to get worn, which means the cranks are buggered. They're great for the track and will be ok for street as long as you keep them tight enough, use a torque wrench and don't skid/skip on them (and use minimal backpedalling).

Out of interest, where did you get them from?