This is an absolute must have for your big power bike with modern tires. Your motor produces as much as twice the HP and tourque of the original, and your tires stick twice as well as the old ones did. These two facts, along with your ability to over ride the machine, will produce "Counter Shaft Deflection". This little baby cures that problem. 6130 billet alloy micro-machined bearing bore, high speed sealed bearing complete with steel sleeve. Done!