well i just received my upgrade after 4 races, 2 from last year and 2 from this year i have had 2 1st place finishes and 2 7th place finishes , i cant climb with the little guys is why i got 7th , they were mnt. finishes ,i know its a little late to ask this but do you think im ready i have good bike handling skills so that's not a problem , im just curious if there is that much of a difference between the 4's and 5's.thanks in advance for your commits