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do road and MTB cranks have different length spindles
do hollowtech 2 bottom brackets from road groupsets have a shorter plastic sleeve on themYes to both. Triple cranks have different spindle lengths too, spacers need to be inserted. If Shimano were sensible they reuse the MTB double spindles on the road triples, but I don't know for certain.
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MTB are 73 (or 83 for downhill), 68 for road double.
Not too sure about the sleeve but the right side cup of a MTB 68/73 BB has a wider threaded section.
hamrack
coventry_eagle
@ffm
Hollowtech 2 cranks: do road and MTB cranks have different length spindles? By the same token, do hollowtech 2 bottom brackets from road groupsets have a shorter plastic sleeve on them (than MTB BBs) so that they'll fit a 68mm wide BB shell without any spacers between the shell and cups?