Agh what's the difference? I've got XTRs but it's like there to ride but they are the correct size 68-73mm, I then run 2 x 2.5mm BB both sides then still need to run some chain line spacers in the axles really shit!!!
The difference is...m810 is single ring and it's thinner and m810-2 is dual chainring,tinny bit wider cause the small chain ring bolts threads stump...something like that
Good job mate!