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8mm and 25
Your bike's weight is supported by the rear tire resting on the ground
To get to the 234-gram weight Shimano looked at every detail from the injection - molded carbon-composite body to the hollow cleat bolts
Custom-butted
This allows for more rider body movement around the seat
Redshift Dual Position Aluminum Seatpost Size:350mm - 27.2 8mm and 25The patented Dual Position Quick Adjust Aero Seatpost lets you ride a true aero position on a standard road bike, without sacrificing your normal road position. Along with the Quick Release Aerobars it provides the benefits of a triathlon or time trial bike without the additional bike or price tag. The key to riding powerfully and comfortably is proper saddle position and since you can switch between road and aero positions on the fly while riding,
