I added 2 teeth to the rear sprocket without adding links to the chain. This effectively moves the axle forward by 1 chain link. I like the way the YZ250F handles/turns with this configuration. I haven't experience any ill effects such as headshake from doing this. I still run the forks 5mm over the TC. I ride strictly motocross, on medium speed tracks, mostly intermediate soil, some hardpack, some sand.