stock FLH had 51 teeth on the rear sprocket, up untill now I
had been using 47 teeth. This year I will try 45 teeth. Normally
the sprocket has 5 bolts, I drilled 5 extra holes and countersunk
all the boltheads a few mm. In combination with lower bolt heads
it is enough to prevent the bolts from hitting the swingarm.
My whole chain is offset 8 mm to clear the rear tire, that is
why the sprocket is so close to the swingarm.