my bike only has a adjustment scale on one side of the swing arm, after adjusting many time and comming up with to tight in some parts of the chain and to loose in others by just turning the wheel i took it to the shop. I got the bike back with bent guides gouges in the swing arm and after I rode for a week the wheel seemed loose, I found the shop tighten the nut so tight they striped it and needed a new axle . but still my back tire is waring fast and seems alot hotter than the front I use a ruler to measure the two sides of the swing arm because of the one scale is missing on one side