If you get anything with a 12T cog, make sure you spray oil/lube inside the gap between the axle and the inside of the cog to displace any water after a wet ride or a wash. Freewheel bearing lump is a larger diameter than a freehub so the smallest cog can hang over outrigger style. This leaves a little pocket where water can sit and penetrate into the bearings over time. This can be a thing but I've never had any problems with any of mine.