This is a link I took out of my single-speed Kona Unit. Now the sliding drop-outs are 1/2″ farther forward. I don’t think I’m fooling myself; the bike feels a bit more lively. I’ve also gotten the chain a bit tighter. This is a 3/32 “8-speed” chain, and seems to drop if there’s much slack. I’ve got a newer one ready that’s a better grade (SRAM PC-870). This one seems to be wearing kind of fast – about 12 1/16″ already for 12 link. I’ve ridden in about 300 miles of trail use. Maybe that’s normal for single-speed?