Put on my new VeloSolo 17T cog today. Nice piece! Pretty gold anodizing. My LBS went full gorilla on tightening the original parts, tho, so had to rotafix to get the old cog off.

Get everything tightened up, go out for a ride. Holy **** i'm flying, these guys were right about a bigger cog being faster cos you spin better... then i turned around. Tailwind became headwind. Still feels better 1T bigger up hills tho.

Then I tried a skid, sickening YARP from the cog against the (loose, after i rode on it) lockring and no skid. Sprint to tighten, coast, retighten.