Help me understand bicycle rolling resistance Hi, There's something that makes no sense to me on bicycle rolling resistance that you might be able to explain to me. I have two bikes: 1 fixed gear with Continental GP 4 seasons front and rear (25mm), and a 90 MTB with Continental race kings protections 2.2" front and rear. The website tells me that the rolling resistance of those tires are: \- 17.6W for the GP 4 seasons at 5.5 bars \- 15.7W for the Race kings pro at 1.7 bars. This is almost exactly the tire pressure I run on those two bikes. Based on what the website is telling, the race kings should be a little bit faster than the GP4 season. The bike fit on my two bikes is almost the same, and I'm using both bike regularly to do a 20 miles route that I know well. I don't have power meter nor any kind of heart related sensor, but I can definitely feel that for the same effort, the 90 MTB is at least 3 to 4 km/h (1.8 to 2.5 mph) slower than the fixed gear.…