Trek Domane SLR 7 P1 review Trek’s fourth-generation Domane SLR 7 P1 brings much lower weight and a more aerodynamic design to the frame and fork compared to the previous Domane SLR 6. While previous generations have focused the design on smoothing rough terrain, this fourth iteration brings the bike very much back to the world of racing. IsoSpeed has gone from the front end, and the system at the rear has been redesigned – simplified and above all lightened. This is combined with a wheel and tyre package that now does the heavy lifting when it comes to comfort. The Trek Domane SLR 7 P1 has a sprightly feel that makes it a formidable companion if your idea of a good ride is dawn-til-dusk mileage interspersed with fast, exciting sections and steady social recovery miles.