Shimano Dura Ace chainring for FC-7900 2x10speed Dura Ace cranksets with a bolt circle diameter of 130mm.
The Dura Ace outer chainring is hollow. That saves weight and improves stiffness. The hollow chainring is 20% stiffer for optimal power transfer and more durability. Also the chainrings teeth are designed for a better contact with the chain to improve power transfer.
Available with different numbers of teeth:
- 39 teeth Type B
- 42 teeth Type A
- 44 teeth Type E
- 52 teeth Type B
- 53 teeth Type A
- 53 teeth Type B
- 54 teeth Type A
- 55 teeth Type A
- 56 teeth Type E
Combinations of two chainrings are only possible inbetween the three types A, B or E. For optimal performance a type A chainring must not be combined with a type B chainring.
Material: aluminium
