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Updated 2026-10-27

ELEGOO Smart Robot Car V4: A wheel wobbles or falls off

Researched by Riley Hart · based on ELEGOO Smart Robot Car V4 build guide and docs · we may earn a commission

Short answer

The wheel went on at an angle or the screw is missing. Start with this: Pull the wheel off and line up the flat side of the shaft.

Why it happens

The wheel went on at an angle or the screw is missing.

How to fix it

  1. Pull the wheel off and line up the flat side of the shaft.
  2. Fix it with the M2x25 screw through the center.

Check the step it comes from

ELEGOO Smart Robot Car V4 step 21: Put on the four wheels
Step 21 of 29

Put on the four wheels

Push a wheel onto each motor shaft, then fix it with an M2x25 self tapping screw through the center.

4 tires4 M2x25 screws

Check: 4 wheels on, each spins freely.

Common mistake: Forcing the wheel at an angle. Line up the flat side of the shaft first.

See this step in the full build guide

Still stuck?

Show the AI coach a photo

Open step 21 in the free build tool, tap Stuck and take a photo. The coach checks it against that exact step and tells you what to change. 3 free questions per kit.

Open step 21 →

Other ELEGOO V4 problems

The app will not connectThe board switch is on upload, or the phone left the car's Wi-Fi.No camera pictureThe camera cable is loose or the camera board is upside down.The car spins in circles or drives backwardMotor plugs are in the wrong ports.The remote does nothingThe plastic tab is still in the remote, or the battery is low.It misses the lineThe line sensor needs contrast and the right threshold.Nothing turns onThe battery is flat or switched off.

All 8 ELEGOO V4 problems and fixes · The full build guide

ELEGOO Smart Robot Car Kit V4.0About $66 to $80. Every part and tool in one box.
Check price on Amazon

Sources

Drawings by robotsforthat. ELEGOO Smart Robot Car V4 is a trademark of ELEGOO. We are not affiliated with ELEGOO.