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@rab
I'm currently on 48x18 freewheel (around 72gi), and although this is fine around town etc, on longer rides or training in Richmond Park it feels I'm mashing a bit and my knees are often just on the verge of discomfort. I'm well past my teenage years - do you older guys just build up a bit, or will dropping my GI (46x18 for 69gi?) open up a whole new world of sunshine for me? No macho nonsense please - I've had kids so don't need to prove anything... ;-)