Our tandem team weight is 282. We very much like Michelin PRO4 Endurance 25mm. Mounted on 23mm rims, they measure 27.2mm. They're fast and reasonably flat resistant. In winter when the roads are more debris-strewn, we run Conti 4Seasons in 28mm. Our favorite summer tire is Conti 4000s II in 28mm, which measure almost 32mm on our 23mm rims. The 4000s II in 25mm also measure a bit over and would be a good choice for a fast, reasonably flat resistant tire.