Vintage Shimano Biopace triple chainring set in silver aluminum for 5-arm cranks.

Rings are stamped Shimano Biopace 48, Shimano Biopace 38 and Shimano Biopace 28 tooth.

Outer and middle rings use 110 mm BCD and the inner ring uses 74 mm BCD for compact triple setups.

Approximate weight for the complete set is 150 g.

Includes three chainrings only as shown, no bolts or crank.