18T Hollow Pulley Wheel Rear Derailleur 9/10/11/12 Speeds Ceramic Bearing Dual-color Oxidation for R8000/7000 Bicycle Parts

I'm not a big fan of OSPWs, but this 18t offset pulley wheel actually works. It allows bigger cassette sizes while maintaining solid RD shifting. On my eR9 groupset, I'm running a 2x 50-34t chainring + 10-36t XDR 12 speed with this setup and no additional modifications were needed except for swapping out the lower jockey wheel.