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 damaged part. Simple, sleek, and colorful appearance. Compatible with Rotor 130BCD road bikes. Road bike chainwheel only; other accessories shown in pictures are not included. Specifications: 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 Notes: No retail packaging included. Please allow 0–1 cm error due to manual measurement; ensure you are comfortable with this before purchasing. Due to monitor differences, the actual color may vary slightly from the image. Package Contents: 1 x Road Bike Chainwheel