Checkpoint+ SL 5 AU Bronze/Trek BlackCheckpoint+ Sl 5 Au Bronze Trek Black The 500 Series OCLV Carbon e gravel platform with the TQ HPR50 mid drive motor discreet, near silent pedal assist that extends your range without changing the ride feel. Same mounts, same clearance, same geometry as the unassisted SL just with a tailwind whenever you want one. Why You'll Love It TQ HPR50 mid drive motor 50 Nm peak torque, near silent, ultra discreet 360 Wh internal battery + optional 160 Wh range