I'm a solid 250lbs, started with stock 14/50, switched to 15/50. Bought it at 916mi, currently a little over 6k mi, made the switch around 2k I think. I find it good for keeping the rpms down on the road while still having plenty of grunt for off road as well. Will likely keep it at 15/50 unless I find another half dozen HP and torques laying around that I didn't know was there. Got front and rear sprockets along with o-ring chain from Procycle, swapped all of it on at the same time. The rear sprocket from Procycle is dished a bit, and you will need to double up on the washers or get thicker washers since you run up against the unthreaded shoulder on the sprocket bolts.