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paulbiche-
The difference between Shimano ROAD and MTB bottom brackets is the length of the threaded portion, the sealing and the width of the "outboard" part. MTB bbs are a little bit thinner.
MTB 10.3 mm vs 11.3 mm ROAD.
If you put a 1 mm spacer on each side you can just use the MTB bb cups with your ROAD crankset. :-)
wenzovic
You'll need a BB RS500 or R60 as your crankset road spaced. No spacers needed as it 68mm only.