The thickest part of the shaft is 22mm, the length is 29 inch, the wheel hub. Fits 6 inch wheels (rim) with 3 bolt pattern and 3 inch bolt to bolt space. Model: 48VDC 1800W Brushless Motor. Motor weight: 10.5 lbs (4.8kg). Matching motor: DC Brushless motor.What is the advantages of brushless motor. Less electrical and electromagnetic noise. Long lifespan: No brushes to wear out, around triple lifespan as brushed motor. Low maintenance: No brushes to replace. Powerfrugal: Power consumption is 1/3 of brushed motor. High efficiency: Brushless motors are typically 85-90% efficient whereas brushed DC motors are around 75-80% efficient. The item "Set of Brushless 48v 1800w Electric Motor Controller Kit Go Kart Rear Axle Wheel" is in sale since Monday, May 31, 2021. This item is in the category "Sporting Goods\Outdoor Sports\Go-Karts (Recreational)\Parts & Accessories". The seller is "tdpro99" and is located in Dallas, Texas. This item can be shipped worldwide.