DO NOT DO A 15/16TH CHAIN!!!!!!!!!!!!!!!!!!!!!!!!!!!

The 7/8 is the same width as the 15/16 chain except measured a smidge differently. IIRC and I might be wrong, the 7/8 will roll back on itself and the 15/16 won't.

7/8 stretches pretty easily if you drive it like I do
15/16 snaps .. never owned one but I did fix a trans after it snapped
Dual V8 chains.. far as I know it's the next best thing to the 1" GMR chainset.