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This is a Micro Hero ultra lightweight aluminum chain ring 53T.
Made from a machined aluminum 7075 T6 alloy, it is lightweight and has excellent hardness.
Comes with an integrated guard for convenience.
Main Specifications:
Teeth: 53T
Weight: Actual measurements approximately 4.1 oz (110 g).
BCD: 5.1 inches (130 mm)
Supported Speed: 8/9/10/11 speeds
Thin teeth thickness: Approx. 0.08 inches (2 mm).
Mounting hole thickness: approx. 0.1 inches (3.3 mm)
No manual or package.