Hobbywing quicrun brushed 540 40t motor features specialized carbon brushed for extended life zero-cogging torque design excellent efficiency outstanding response and control adjustable mechanical timing of the motor modular design for easy service and cleaning specifications model: quicrun brushed 540 pn: 30404314 slot: 3 turns: 40t (rpm@7. 4v): 10500 input voltage: 12. 6v diameter/ length(mm): ?=36mm(1. 42in) l=53mm(2. 09in) shaft diameter/ length (mm): ?=3. 175mm(0. 125in) l=16. 5mm(0. 65in) applications: 1/10 on-road / buggy / crawler & 2wd truck weight: 169g (hw30404314)