Listing for Circle Aero type ，range 44T-60T.

Includes: 1pcs CIRDLE chainring with bolts
Shape: CIRCLE chainring, hollow model
Compatible with B.C.D 110mm
4 arms, Fit for 105 R7100 Ultegra R8100 Dura ace R9200 crank, single speed,can not use for double chainring.
Material: AL7075-T651 CNC made
Strength: HB150
Thickness:4mm
Designed for SHIMANO dura ace R9200 , and Ultegra R8100
fit for MTB 9-12 speed, road 9 -11 speed
and shimano road 12 speed
Weight: 151g / 54T ; with alloy bolts 158g/54T