This is the Axial AM55 55T Rock Crawler 540 Size Electric Motor. Designed exclusively for RC Rock Crawlers. Easily equip or upgrade (comes with bullet connectors. No soldering required) your AX10 RTR for more low-end pull and slower wheel speed while crawling.

Specifications:
Number of Turns: 55
Input Voltage: 4+ cells (12VDC max)
Motor Size: 2”x1.4" (52x36mm)
Shaft Diameter: 0.125" (3.2 mm)
Shaft Length: .5” (12.5mm)
Weight: 5.8oz. (164g)
Mounting Pattern: 25mm