Only 1 1/2 lbs, our Carbon Hard Shell Seat features a wider seat base for added comfort. If you're a no excuse, winner-take-all racing addict, or just want to shave some extra pounds off your bike, this is your seat! Comes standard on the Aero and Carbon Aero and is an option on the Giro 20, Giro 26, Strada and Corsa models. Bacchetta seats are to be used with Bacchetta bikes only! We do not provide adaptor kits for other bike models. Seat stays and pull pins are not included with the seat.