SAB Aluminum Motor Pulley Z23 - Goblin 500/570 [H0215-23-S]
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I ordered this for my Quantum 4025 1100kv motor, for my Goblin 570 KSE 6S. It's the best size for this motor on 6s to run head speeds between 2000 and 2300 without over-amping your Castle 120 ESC. It's nice and light, aluminum, but once I installed it I found it impossible to remove without damaging the soft metal lip. So, if using with the 6mm Quantum shaft, consider it a one-time install as you will probably destroy it if you ever want to remove it and switch pinions. On the positive side, it probably will never slip and should last hundreds of flights if your belt is tight.