Sirrus X is a comfortable, capable bike designed to inspire you to ride more than ever before. With bigger, confidence-inspiring tires, a slightly more upright riding position, and a super intuitive one-by drivetrain, it's a solid partner on pavement and a dialed option when it's time to hit some gravel. The bike comes equipped with plenty of mounts for racks and fenders. Every Sirrus X features next-level comfort from scientifically tested and ergonomically engineered Shared Platform Body Geometry saddle, handgrips, and pedals. The Sirrus X 4.0 is equipped with the revolutionary Future Shock to take the sting out of bumps and potholes, delivering 20mm of compliance for maximum comfort and control over rough terrain. The Sirrus X 4.0 features a carbon fork and A1 SL alloy frame that delivers a build 1.6lb (.8kg) lighter than the 3.0 model. The wide-range 1x11 SRAM NX shifting delivers precise shifting for the long haul.