30.9mm Bike Seatpost: Bicycle Seatpost for Mountain & Road Bikes | Jenson USA
NEW ULTIMATE Seatpost Aluminum 30,9 mm, 92,50 €
Amazon.com: Suspension Seat Post, Shock Absorber Post, Aluminum Mountain Bike Seat Post with Protective Cover, for Most Mountain and City Bikes, 27.2 28.6 30 30.4 30.8 30.9 31.6 33.9 X 350mm : Sports & Outdoors