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Vehicle Wheels Sink through Floor (Collisions Ignored)

My vehicle wheels fall through the floor. I tried:

  • Re-importing the FBX source asset, setting up the physics from scratch

  • Following different tutorials and reading up documentation

  • Contacting a Youtuber who used the same asset pack and followed his step-by-step

The wheels still sink through the floor, their collision is ignored completely in-game. In the physics editor, it collides perfectly. If I drop the car into my scene and simulate, it works fine and the collisions are correct - wheels even spin when the car moves.

The problem starts when: I properly set up the wheels in the vehicle's movement component (naming them, etc. in the correct order).

I've done everything accurately as every tutorial described, even the YouTuber who had used the same assets and got around the same problem and my issue persists.


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asked Oct 03 '17 at 01:26 PM in Using UE4

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Sinn Studio Inc.
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avatar image pzy64 Jan 15 '18 at 04:18 AM

You might need to increase wheel radius in your Vehicle Wheel blueprint (or UVehicleWheel class)

avatar image Saah88 Mar 18 '18 at 12:54 AM

increasing Wheel size (in BP/C++ class) will not work here, the minimal size is the Mesh's size, not the Class's setting. i replied about it there:


This topic is about different thing, which i today learned how to fix (i posted my answer below).

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3 answers: sort voted first

Hey can you try increasing the uniform scale in your skeletal mesh and then reimporting the mesh using the reimport option on the top in the skeletal mesh editor. This helped me earlier when I faced the same issue. The Unfurom Scale value only seems to reflect when you reimport the mesh.

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answered Oct 03 '17 at 05:48 PM

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you need to apply roation and scale on the wheels and mesh

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answered Jan 08 '18 at 11:19 AM

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True Origins Int
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If you have set everything correctly:

  1. measuring unit "cm"

  2. Joints dont have any rotations (they must be zeroed 0;0;0)

  3. Mesh is oriented as X to Forward (Y to side, Z to up)

  4. Z = up, not Y. Y = side.

then just read my post there:


Otherwise read that whole thread (just 2 pages, until my post).

I have solved exactly same issue, so i know what i link.

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answered Mar 18 '18 at 01:27 AM

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