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So, I now have one data point.
Comparing last couple of commutes on this bike that are conveniently about the same duration, with today, for the same speed I put in an extra 50W / 140kcal today to push those 47mm bastards along.
So, you're right, they're not slow... if you put in 25-50% more work.
(yeah, yeah, weight is gonna be a little different and air density, wind, etc but they're still feel a chore compared to the other tyres)
hippy
Saffronspokes
cgg
Show me data