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Seems to be pretty much bang on 68mm, but maybe a road crankset in a mountainbike bottom bracket causes the need for spacers. With a 2mm spacer at the NDS there's maybe 1mm of crank overhanging from the axle (does that make sense?) and everything seems to be working fine.
My thinking with stuff like this is that everything is hugely over-engineered for my 61kg anyway.
Tijmen
Brommers
You shouldn't but your BB shell might be out of spec in which case a BB spacer is the correct answer. Which side or sides it should go on would be a different question...