Registered Forum User
BSB Star
Posts: 5,018
Join Date: Jun 2003
Location: Chelmsford, Essex
Mood: the rain in spain falls mainly on me!
620 will be very competitive next year with a few of the quicker 583 riders coming up. you will definitely be quicker on a 620 how much is difficult to say but if you do move up there will always be people to battle with and you will get fatser as a consequence.