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Depends how hard the bunch is going, or what kind of cadence you enjoy. Do-able on the big ring and may be worthwhile because the bunch often kicks at the bottom and top of the hill and you don't really want to be fucking about changing gear on the front.
Yes, I've dropped a chain going over the top before.
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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.
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All of the London circuits (and Cyclopark) are big ring (53) only. If you've got a semi-compact or a smaller it's even easier.
Main problem as mentioned above is potential to drop chains or a slow shift. You want to be focusing on position and response to others rather than shifting your front derailleur.
How much climbing in a cat 4 crit at hog hill?
Is it a small chain ring job even if running a compact?