TREK CHECKPOINT SL6 DISC GRAVEL BIKE 2021A hugely versatile option, Trek’s Checkpoint SL6 Disc Gravel Bike can be loaded up for far-flung adventures, stripped down for fast gravel rides or used as a daily commuter with mudguards and rack.The 500 Series OCLV Carbon frame incorporates Trek’s innovative IsoSpeed decoupler for more compliance off-road ..