If you want to do adv and sit at 120, 600 your go to.
If you want to do adv and sit at 100, 600 your go to.
If you want to enduro, 400 your go to.
Want to wheelie, 400 go to.
My 400 had upgraded mods on suspension, very stable on gravel and kicks 600's *** in this class.( but I could do the...