Shimano Sm-ma90-r160-ps Adapter 160mm Caliper: Post Mount: A-std Rear Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button... Shimano Sm-ma90-r160-ps Adapter 160mm Caliper: Post Mount: A-std Rear Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button...