Cane Creek Seatpost Shim 27.2 to 31.8mm Spring Weight-600 X-Range gearing technology gives you

X-Range gearing technology gives you more range and a smoother gear progression so you're always in the right gear Tooth Count 44 Drivetrain Speeds 12 Round or Oval Round Defined Color Black Direct Mount Type Direct Mount SRAM 8-Bolt Size 44T

Maximum 90 psi pressure

Fully integrated angle adjustment

Converts braze-on front derailleurs to clamp style

Constructed from steel and nylon

Cane Creek Seatpost Shim 27.2 to 31.8mm Spring Weight-600 X-Range gearing technology gives youSolution for fitting seatposts to most any seat tube size 3 7 8" tall machined aluminum, black anodized, laser etched with sizing info Model Seatpost Adapter OD 31. 8mm ID 27. 2mm