Upgrade your mountain bike with this NOS Shimano Dura Ace 51T chainring. Made of high-quality aluminum, it features a 5-arm mounting type and a distance between bolt holes of 130mm. With its sleek black color and durable construction, this chainring is perfect for any cycling enthusiast.

This chainring is compatible with mountain bikes and comes with one item. It is a great addition to your bike components, ensuring smooth shifting and a comfortable ride. Made in Japan, this chainring is a reliable and long-lasting choice for your cycling needs.