HPI Spur Gear Nitro 2-Speed Nitro 3, 43T 1M 43T, Mod 1
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HPI Spur Gear Nitro 2-Speed Nitro 3, 43T 1M Part# 0-HPIC7187
Outer diameter: 45mm (1.78") Inner diameter: 14mm (0.56") Thickness: 5.2mm (0.21")