Hi, I realize this is dumb, but I only have 4 abec 7's and the rest crappy 5's, is it worthwhile using the 4 7's that I have or just stick to the full set of 5's?
Real men ride on core... If you don't fancy doing this I recommend getting a full set of the same bearings. If you ride with odd bearings it adds heavily to wheel wear. OH NO!