The shaft is bigger than a regular 1/10 motor. The Reedy Sonic 544 Mach 2 Motor is a powerful 4800kv brushless motor designed for 1/8 scale 1RC cars and trucks. Made by the reputable brand Reedy, this motor is compatible with universal brands and is suitable for vehicles in the 1:8 and 1:10 scale range. With its inner runner design, the Reedy Sonic 544 Mach 2 Motor delivers high performance for radio control enthusiasts aged 17 years and up, offering a reliable and efficient option for enhancing the speed and power of your vehicle.