I ordered this from Amazon. Realized it didn’t fit my bike. The crank arm says “180” on it, but the listing said 172.5. I assume these are 180, but not entirely sure. Never used. Haven’t tested it, but it lights up so I assume it works.

Enhance your cycling experience with the Pioneer Shimano DuraAce 9000 172.5 Power Meter Crank Arm (SGY-LT90-1725). This top-of-the-line crank arm from Pioneer is perfect for cyclists who want to take their training to the next level. With power measurement provided, you can accurately track your performance and make adjustments to your riding style as needed. The crank arm is specifically designed for cycling and is compatible with Shimano DuraAce 9000, making it an ideal fit for serious cyclists. Add this high-quality component to your bicycle electronics and take your cycling game to new heights.