Boardman X7 Alloy frames have triple butted tubing, whereby the tube has differing material thicknesses along the length of the tube, enabling us to reduce the weight of the frame and enhance comfort without any reduction in stiffness or strength. Seat Tube: 48.5cm. Steerer: 1 1/8″- 1 1/2″ Tapered tubing. Color: Red / Black. Also check out my other components in a very competitive price.