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yeah, i know i was pushing it.
But i enjoyed it......on the regular roads.
but since my commute changed i had to switch up
legs felt good even if my joints didn'tsurprisingly, going up hill was always fine. like you mentioned, it's downhill where i noticed it. I often found myself over taking people on the ascent and having them whip passed me on the way down.
///////////////
Assuming 23mm tyres, that's 80.5 GI: no wonder your knees hurt!
That's a tall gear to be leg-braking on, never mind the hills.
Something around 67 GI and brakes (so you don't spin-out downhill) would be a lot more pleasant.