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Yeah, I get that. I'm just wondering whether anyone has actually tried riding down a hill on a wide and narrow set of tyres and compared the difference. I reckon that unless you're going in a straight line on perfect tarmac, the fat tyres might have an edge.
frankenbike-
I built a 90's mtb as a roadbike, with the same setup as my roadbike, with 44 Compass ultralight tyres. Somehow it was harder to ride in the same group as usual on audaxes and climbing felt more fatiquing. Maybe the frame is just too flexible or something. The weight was about the same.
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Yeah, I get that. I'm just wondering whether anyone has actually tried riding down a hill on a wide and narrow set of tyres and compared the difference. I reckon that unless you're going in a straight line on perfect tarmac, the fat tyres might have an edge.
Late but I've done a route with a nice descent on both my road bikes - one with 25mm Pro Ones the other with 40mm semi-slick Maxxis Re-fuses, both tubeless. Hit the exact same max speed (49.5 mph). I run the 40mm tires at ~50psi and it doesn't feel slower, gets a nice sustainable rhythm on the flats and deals with random dirt roads much better. I'd like to replace both these bikes with one fitted with ~32-35mm tires and guards.
Samuli
Yemble
Going down a hill wide tyres definitely have an aerodynamic impact making it slower.. But at a constant speed bigger tyres actually have a lower rolling resistance and can be faster.