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I did a cat 4 last month with a compact. Shifted into the little ring during well before the hill on every lap and it was def the right move for me. I fitted new rings the night before and dropped my chain once, but as I was doing it early I was able to get it back on without losing any time.
Stuck with the small ring for the final climb/sprint and although I reached 120rpm and was cross chaining a bit, I won the bunch sprint so think it was the right call.
How much climbing in a cat 4 crit at hog hill?
Is it a small chain ring job even if running a compact?