I got a really good deal on a band new shimano ultegra 10 speed crank and bottom bracket on ebay, 65 bucks. I was'nt realy thinking at the time and didnt stop to consider whether or not it will work with my 9 speed drivetrain. Will it?
This thread isn't worth making a sticky so far. But an FAQ would be useful more generally.
As cranks are designed for more speeds, their chainrings can get closer together because the chains used are narrower. However, I don't think there's meaningful diff between chainrings designed for 9 and 10 speeds. There is a diff between 8 and 9, but it's slight.
Chainline should be the same. The new integrated-BB cranksets are designed for the same chainline as more traditional cranksets. In the case of the road triple, chainline at 45mm (for the middle ring).
shimano ultegra 10 speed crank and bottom bracket on ebay, 65 bucks.
*WARNING: southern hemisphere bike price whinge to follow
When the Dura-Ace 10sp cranks first came out, they were retailing down here for ~$720!!! (~$540US)
My SUPER deal from my LBS, who absolutely LOVE me, was $510 (~$380US) for the DA 10sp Cranks and BB!!!