Traxxas 7045R 48 Pitch Spur Gear, 45T 48P, 45T spur gear.
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Traxxas 7045R 48 Pitch Spur Gear, 45T Part# 0-TRA7045
Outer Diameter: 24.75mm (0.97") Inner Diameter: 5.5mm (0.22") Width: 7mm (0.28")