Shimano Chain Rings Inner and Outer 105, Ultegra and Dura Ace Various Sizes
The Shimano Ultegra R8000 chainring. Featuring a four-arm design and a 110 BCD, this is a stiff and durable option, while the aluminium construction ensures low overall weight. Shimano Chain Rings. SHIMANO DURA-ACE FC-R9100 CHAINRINGs.