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The strongest argument IMO is ride characteristics. A 650x42-47 handles better with drop bars than a 700x42-47. Add full mudguards into the mix and the 650 wins hands down. I say this at 190cm on a frame that could handle 700. IMO/2p/subjective/etc
I think if I was racing a big gravel event like they have in the states where some sections can be quite rocky, without mudguards, I would run a 700x42 for the angle of attack argument, which I think would be valid over a long distance.
But I ride 50/50 on/off road and 650bx42 with full guards is perfect.
Now we’re back on tyres, should we switch back to eviscerating GRX in Feb?
Exactly what someone would say trying to keep it a secret. I'm onto you buddy.