-
Are Hollowtech II BBs all the same across the range (will the one I have work with all Hollowtech II road cranks?)
Not quite, there are (talking threaded shells) road and MTB ones, and some wider MTB ones. Although from what I can tell the cups are essentially the same and the internal sleeve spacer between is different to match the axle length of the cranks. Road BBs don't use spacers and are only for road cranks on 68mm shells, MTB BBs use spacers depending on shell width for MTB cranks. If your cranks are MTB and you want to use the 5700 BB then don't bother with the internal spacer and use the right amount of 2.5mm spacers on the cups.
snottyotter-
If your cranks are MTB and you want to use the 5700 BB then don't bother with the internal spacer and use the right amount of 2.5mm spacers on the cups.
Just for fullness of clarity, I believe the road and mtb bearing cups are different widths so it's not as easy as adding spacers to a road bb to make it into a mtb one.
M_V
I need to swap out the cranks on my bike as they need new chainrings and a BB that I can't be arsed to order.
I have available a few sets of Shimano Hollowtech II cranks, but only one BB (BB-5700)
I have the following compatibility questions.
Are Hollowtech II BBs all the same across the range (will the one I have work with all Hollowtech II road cranks?)
The frame is 68mm English thread BB (I think) so this should work with 2? 2.5mm spacers?
The groupset is 9 speed Campag, the cranks are either 10 or 11 speed Shimano depending on which I fit, will there be issues with the 9 speed chain?
I think all should be fine, but don't want to spend a few hours taking apart, reassembling, to find it doesn't work.