The proven parallelogram principle is also present in this seat post. Unlike many other suspended seat posts, the Suntour moves downward as well as slightly backward when compressed. This significantly increases your riding comfort. Suntour design parallelogram seat post travel 50.0 mm color black length 350 mm material aluminum Available diameters are 27.2/30.9 and 31.6. Your Bike Station Wigoltingen Team