I was swapping the cranks and bottom bracket on my karate monkey from a Truvative stylo crankset (Mountain Double, GXP bottom bracket) to a Race Face Evolution DH (Mountain Triple, Race Face bottom bracket, It's Shimano Hollowtech II compatible I think).
However, the width (Q-factor?) of the Race Face triple crankset is wider than the Truvative Stylo. If I install it and tighten the bolt, it looks to be 5mm+ of exposed space on the crank spindle and the crank arms can slide side to side through the bottom bracket since the spindle is so long. I'm pretty sure my BB shell is 73mm (according to surly).
What do I need to do to compensate for this space? Spacers between BB Shell and BB Cup? How many spacers will I need, and of what size? Is there some common spec listed for the cranks that I should have been able to tell this from the start?