Climbing, GuidesJames RaisonMay 03, 2017tyres15 Comments Heavy Vs light tyres - how much slower are they? What is the real-world difference between heavy and light tyres? Well, I tried to find out with some semi-science. But didn’t. Well, I sort of did. Climbing, GuidesJames RaisonMay 03, 2017tyres15 Comments