Wilier Zero.9 Asymmetrical Rear Arms For Improved Pedal Response Wilier Zero.9 Asymmetrical Rear Arms Sizes: 150 × 150 / 300 × 231 / 768 × 592 / 1,024 × 789 / 1,256 × 968 / 1,256 × 968 / 1,256 × 968 / 1,256 × 968