This is a genuine Shimano 52T-MB outer chainring for Ultegra FC-6800 cranksets with 52-36T gearing.

What it's for

A replacement big ring for a worn Ultegra 6800 crankset. Shimano marks rings with a letter code so the inner and outer rings shift as a matched pair.

Compatibility

• Fits: Shimano Ultegra FC-6800, 52-36T combination
• How to check yours: the crank model is stamped on the inside of the crank arm. Match the letter code on your old ring

Specs

• Teeth: 52T
• Type code: MB
• Shimano part number: Y1P498070