Quick answer

For most Redcat vehicles, a brushless motor upgrade delivers more power and longer runtime, but you must verify the motor mount pattern, shaft diameter, and your ESC's compatibility. If you're on a tight budget or running a stock brushed system, a direct brushed replacement keeps things simple and reliable.

Brushed vs Brushless: What Changes

Brushed motors are simpler and cheaper, making them ideal for casual bashing or entry-level builds. Brushless motors are more efficient, produce more torque, and require less maintenance, but they also demand a compatible brushless ESC and often a stronger battery. If you're upgrading from brushed to brushless, plan to replace the ESC and possibly the battery connector as well.

The motor's physical size (can diameter and length) must match your vehicle's motor mount. Common sizes for Redcat models are 540 (standard) and 550 (slightly longer). Measure the existing motor or check your manual before ordering. A motor that's too long may hit the chassis or gearbox.

Fitment Checklist for Your Redcat

Before buying a replacement motor, confirm three things: the mounting hole pattern (usually 25.4mm or 26mm spacing), the shaft diameter (typically 3.17mm for 540 motors, 5mm for larger ones), and the pinion gear bore size. If the shaft is too thick, the pinion won't fit. If the mounting holes don't align, you'll need an adapter plate or a different motor.

Also check your vehicle's weight and gearing. A higher-turn motor (e.g., 21T) gives more torque for crawling, while a lower-turn motor (e.g., 13T) increases speed for racing or bashing. Brushless motors use KV ratings instead of turns: lower KV means more torque, higher KV means more RPM.

Decision Rules for Your Motor Swap

  • Check your ESC first: A brushed ESC cannot run a brushless motor. If your vehicle came with an integrated ESC/receiver, upgrading to brushless may require a new receiver too. If your ESC is brushed, stick with a brushed motor or plan a full ESC upgrade.
  • Match the can size and shaft: Measure the existing motor's length and diameter. A 540 motor is standard for most 1/10 scale Redcats; a 550 is longer and may not fit without modification. Use the same can size unless you're also changing the mount.
  • Consider gearing and weight: A lower-turn (or higher KV) motor spins faster but may overheat in a heavy rig. A higher-turn (or lower KV) motor runs cooler and pulls better on steep terrain. Match motor KV to your driving style: low KV for crawling, high KV for speed runs.

Replacement Parts That Help

  • 50038: These Redcat Racing lower inner suspension arm hinge pins are replacement pins for the suspension linkage. Each package includes 4 pins, with each pin measuring 6 x 94 mm. When swapping motors, you may need to remove suspension arms to access the motor mount. Having fresh hinge pins on hand prevents sloppy suspension after reassembly.
  • RER13520: The Redcat Racing RER13520 Differential Gear Set is a replacement part supplied as a one-set package. It is listed by Redcat Racing under the part category and is intended for use with the vehicle applications noted below. A more powerful motor can stress differential gears. Upgrading to a fresh gear set helps handle the extra torque and avoids stripping teeth during hard acceleration.

Which Motor Fits Your Build?

Best for

  • Drivers upgrading from brushed to brushless for more power and efficiency
  • Racers or bashers who want a direct-fit motor without modifying the mount

Not for

  • Complete beginners who are not ready to replace the ESC and battery connectors
  • Drivers who want a drop-in replacement without checking shaft diameter and pinion compatibility