DUO Cool Down 27.2mm BMX Seatpost Extender - Black 21t The calipers features cold-forged aluminum

The calipers features cold-forged aluminum arms and a quick adjust/release mechanism

The tread features a BMX-style rounded profile block tread with shallow siping for improved bite

double walled

Nickel-plated sprocket ring

This lightweight design is even easier to handle around town and helps to reduce effort on longer rides as well

DUO Cool Down 27.2mm BMX Seatpost Extender - Black 21t The calipers features cold-forged aluminumThe DUO Cool Down race post is designed for cooling down after a fast lap around the track. Racers remove their race seat & post from their bike, drop in the DUO Recovery post into their frame, then insert their race post in the top. This creates road bike type sizing for efficient pedaling while seated. Perfect for training rides aboard a race bike too. Aluminum construction, 1 piece design Black anodized finish w silver etched DUO capsule pattern