Originally Posted by DrIsotope

My bike weighs 26lbs loaded. I recently switched from 700x28s to 700x32s, and I've racked up about 200 PRs on Strava since the tire change (~1000 miles,) including improving 3 of my KOMs. So some heavy bikes will be slower with some wide tires, some of the time. Biggest factor is the rider, as with anything else.