What Is Redcat Part 11185 Used For?

By Redcat Racing | Published: 2026-10-28

Category: Product Reviews

Redcat Part 11185 is a 15-tooth brass pinion gear for VOLCANO EPX and EPX PRO models. Learn its function, compatibility, and how to know when to replace it.

Quick Answer

Redcat Part 11185 is a 15-tooth brass pinion gear that transfers power from the motor to the drivetrain in VOLCANO EPX and EPX PRO models, and it also fits compatible legacy Blackout vehicles.

Why the Pinion Gear Matters

The pinion gear is the first gear the motor spins. It meshes with the larger spur gear to turn the wheels. If the pinion wears or strips, your RC loses power and may not move at all.

Part 11185 uses a 0.8 module pitch, which means the tooth size and spacing are designed to match the spur gear on your vehicle. Using the wrong pitch can cause poor mesh, noise, and premature wear.

Compatibility and Limitations

This part is a direct replacement for the VOLCANO EPX and EPX PRO. It also fits legacy Blackout models and other applicable Redcat vehicles, but Redcat does not publish a full compatibility list for every model.

If you are not sure whether Part 11185 fits your vehicle, check your owner's manual or contact Redcat support with your model number. Installing a pinion with the wrong tooth count or pitch can damage the gear mesh.

Common Questions About Redcat Part 11185

What does the pinion gear do?: The pinion gear is mounted on the motor shaft and transfers rotational force to the spur gear, which drives the wheels. Without it, the motor cannot move the vehicle.
Which Redcat models use Part 11185?: It is a direct replacement for VOLCANO EPX and EPX PRO models, and it also fits compatible legacy Blackout vehicles. Confirm your model in the manual or with Redcat support if unsure. Check your model number before ordering to avoid a mismatch.
How do I know when to replace it?: Inspect the teeth for wear, chips, or stripped areas. If the gear slips, makes grinding noises, or the car moves sluggishly, replace the pinion gear. Regularly inspect the pinion after running in dirt or grass to catch wear early.
Can I install it myself?: Yes, if you have basic RC tools. Remove the motor, loosen the set screw, slide off the old gear, and press on the new one. Tighten the set screw against the flat spot on the motor shaft. Ensure the set screw is tight but not over-torqued to avoid stripping the threads.

Product Facts

11185: This is a single 15-tooth pinion gear with a 0.8 module pitch, made from durable brass. The 15-tooth count and 0.8 pitch ensure correct mesh with the spur gear, so power transfers smoothly without slipping or excessive wear.
11185