Brand Features: Made of high-quality 7075 aluminum, lightweight, durable, and precise. Ultralight design does not add excessive weight to your bicycle. Easy installation, direct replacement for old or broken chainwheel. Simple, sleek, and modern appearance. Compatible with Rotor 130BCD Road Bike. Road bike chainwheel only; other accessories shown in the picture are not included. Specification: Material: 7075 Aluminum Optional Sizes: 50T, 52T, 54T, 56T, 58T, 60T 50T Size: approx. 20.9 x 20.9 x 1 cm / 8.23 x 8.23 x 0.39 in 52T Size: approx. 21.6 x 21.6 x 1 cm / 8.50 x 8.50 x 0.39 in 54T Size: approx. 22.5 x 22.5 x 1 cm / 8.86 x 8.86 x 0.39 in 56T Size: approx. 23.3 x 23.3 x 1 cm / 9.17 x 9.17 x 0.39 in 58T Size: approx. 24.1 x 24.1 x 1 cm / 9.49 x 9.49 x 0.39 in 60T Size: approx. 24.9 x 24.9 x 1 cm / 9.80 x 9.80 x 0.39 in Color: Black Quantity: 1 Piece Note: No retail packaging included. Please allow 0–1 cm error due to manual measurement. Check measurements carefully before purchase. Due to differences in monitor displays, actual color may vary slightly from image. Package Contents: 1 x Road Bike Chainwheel