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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
snottyotter
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.