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It's more about individual hills than the total. Especially if it's wet. Certain hills can be shorter but shitter because of steepness or traffic lights. I mean, there's nothing around London that will challenge their heat capacity or anything, it's more that it sucks white knuckle gripping the levers for 30 seconds before you even start slowing down and doing that multiple times in a ride.
Yeah that sounds like an ideal setup.
When you say coming down lots of hills, what sort of elevation would you consider that ride to be so it's challenging in terms of breaking on carbon rims? Would it be something over 5k feet or below?
Also, maybe something worth mentioning but I'm not too heavy at around 70kg, that might make a difference?