Hi i'm new on these forums so i apologize if this has been asked before...
I want to start racing but i am not sure if my fitness is good enough yet. I can average 18mph on my own for a reasonably hilly 30 mile training ride on my own. (i live in Plymouth so there are hills everywhere).
what i was wandering is what sort of average speed would i need to be able to keep up for a 4th cat race and is it better to enter a circuit race 1st or a road race??

thanks in advance