Technical Q&A with Lennard Zinn: Old-school rims and bearing drag

Old-school rims at Paris-RoubaixDear Lennard,I noticed that all the teams for Paris-Roubaix used old-school tubular rims for the race. How come they don't use the fancy composite tall rims as they do during the rest of the season? Did it have to do with their stopping power in the dry, dusty conditions or the punishment of the cobbles?Peter Dear Peter,Both. Carbon rims, especially deep-section ones, are so much stiffer that they are likely to crack rather than flex and bend like an aluminum rim would. In a crash, jagged carbon edges are worse than bent aluminum. And of course,