These changes generally allow a rider to be more relaxed, saving energy-having to pay constant attention to the road surface and correct for every deflection can cause cyclists to tense their hands, arms, shoulders, and neck, leading to fatigue. (The exact amount differs from size to size.) Coupled with a slightly lengthened wheelbase and lowered bottom bracket, this is intended to improve stability when the bike hits bumps at speed on pocked or cobbled roads. To help the frame perform well on brutal terrain, Felt relaxed its typical race geometry, slackening the head-and seat-tube angles by a little more than one degree.
This heritage, combined with several key changes, optimizes the F1 PR for the diverse rigors of the spring Classic races and make it a versatile companion for any kind of spirited riding you want to do, on any sort of road. The F1 PR also shares a lot of features with the previous version of Felt's more thoroughbred road racer, the F1. Felt developed this frame to be used in the 2007 edition of the cobbled, one-day race also known as the Hell of the North, and the bike landed on the podium that year. The abbreviation, PR, in this bike's name is an allusion to Paris-Roubaix.
