Yeah, when out on my own on my full-guarded tank bike with an ancient set of Conti Top Touring 2000s (actually 26mm), I'd only average around 2mph less than the summer bike for a committed solo ride of 50-75 miles on undulating (but not hilly) terrain. And some of that's probably down to the difference between atmospheric/road conditions in summer vs late autumn/early spring.
As for the winter, I've been chugging along on 800g studded 30mm tyres, so clearly don't give a shit about much other than staying upright.
Yeah, when out on my own on my full-guarded tank bike with an ancient set of Conti Top Touring 2000s (actually 26mm), I'd only average around 2mph less than the summer bike for a committed solo ride of 50-75 miles on undulating (but not hilly) terrain. And some of that's probably down to the difference between atmospheric/road conditions in summer vs late autumn/early spring.
As for the winter, I've been chugging along on 800g studded 30mm tyres, so clearly don't give a shit about much other than staying upright.