most aero seat post we've ever made ensuring fast-moving
It's the perfect bike for your little ripper to start getting out on the trail with—we just wish that we had one when we were kids
braze-on Rear Derailleur Shimano Dura-Ace R9250
1-1/8" to 1-1/5" Delta steerer
Specialized Sirrus X 1.0 clipless most aero seat post we'veDetails Offering an unprecedented combination of comfort, efficiency, and nimble handling, the Sirrus X excels on pavement, dirt, and any terrain in between. SMOOTH, COMFORTABLE, AND EFFICIENT: Sirrus X provides the smoothest ride in its class. With bigger, confidence inspiring tires, a slightly more upright riding position, and a super intuitive one by drivetrain. RIDER FIRST ENGINEERED: Like all Specialized performance bikes, the geometry of each