Material: Made of 7075 aluminum alloy, CNC machined with narrow-wide tooth design to help prevent chain drop and provide strong performance. Specifications: Compatible with 130mm BCD cranks. Easy to Use: Features mud discharge slots to reduce sediment buildup. Each tooth is precision CNC machined to smoothly engage with inner and outer chain links, reducing friction and noise. Design: Round chainring with anodized finish to resist oxidation and corrosion, forming a protective layer on the aluminum surface for increased durability. Note: This chainring is compatible with most 130 BCD cranks. Please verify your crank's BCD and required tooth count before purchase. Specifications: Material: Aluminum alloy Size Chart: 50T: 20.9cm x 20.9cm / 8.23inch x 8.23inch 52T: 21.6cm x 21.6cm / 8.50inch x 8.50inch 54T: 22.5cm x 22.5cm / 8.86inch x 8.86inch 56T: 23.3cm x 23.3cm / 9.17inch x 9.17inch 58T: 24.1cm x 24.1cm / 9.49inch x 9.49inch 60T: 24.9cm x 24.9cm / 9.80inch x 9.80inch Package Includes: 1 x Bike Chainring Note: Slight measurement variations may occur due to manual measurement and display differences.