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Shimano road and mtb bb's are different dimensions. The cups of the road ones are 1mm wider
Useful info here:
http://www.tobiasfeltus.com/blog/the-burning-question-can-i-use-a-shimano-road-bottom-bracket-on-a-mtb/
kjlem
best bang for buck shimano hollowtech bb ? would i be looked at funny if i used a ultegra level bb on an mtb ? is there any reason not to use a road bb for an mtb or vice versa ? do the mtb bb's have extra seals or extra protection for the bearings ?
and finally are some made so that you can pop the seals out and re grease ? i've got a bb noise on my roadbike with a da hollowtech. popped the seals out and regreased but it's still making a noise. thinking about replacing.