# Chaos vehicle wheel width has no effect **URL:** \ **Category:** World Creation\ **Tags:** unreal-engine, UE5-0, Physics, Vehicles, question\ **Created:** [August 28, 2022, 12:34pm UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781 "2022-08-28T12:34:48Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![KaidoomDev](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kaidoomdev/32/977996_2.png) [@KaidoomDev](https://forums.unrealengine.com/u/KaidoomDev)\ **Post date:** [August 28, 2022, 12:34pm UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781/1 "2022-08-28T12:34:48Z")
Hi, so no matter what value I put it doesn’t seem to affect anything, like I can put 0.01 to 100+ it’s not doing anything, can someone explain if this setting has any effect on wheel behavior/collision ? Wheel radius working just fine and you can see the difference. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/4/e/a4ed4bee83c8b4d11e712659a22dbd8484b9804a.png) Thank you. ---
**Author:** ![Astrotronic](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/astrotronic/32/1194566_2.png) [@Astrotronic](https://forums.unrealengine.com/u/Astrotronic)\ **Post date:** [August 31, 2022, 2:55am UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781/2 "2022-08-31T02:55:57Z")
Hi Kaidoom, Cool question, I’ve been keen on understanding Chaos Vehicles better, so I tried looking into this. In [https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Plugins/Experimental/ChaosVehiclesPlugin/Source/ChaosVehicles/Private/ChaosWheeledVehicleMovementComponent.cpp](https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Plugins/Experimental/ChaosVehiclesPlugin/Source/ChaosVehicles/Private/ChaosWheeledVehicleMovementComponent.cpp) (You must [link](https://www.epicgames.com/help/en-US/epic-accounts-c5719348850459/connect-accounts-c5719351300507/how-do-i-link-my-unreal-engine-account-with-my-github-account-a5720369784347) your github account to Epic and be logged in to see this) I found 2 instances of WheelWidth 1. `float Radius = PVehicle->Wheels[WheelIdx].Setup().WheelWidth * 0.5f;` and then that ‘Radius’ float was used for some line traces. I wonder if someone has confused Wheel Width (How fat a tire is, as in length of contact patch) with how wide a rim is. 1. In a block of commented-out code for calculating WheelDimensions I realize that isn’t particularly helpful, but hopefully it can unlock some new ways on our paths to grokking Chaos Vehicles. 🧠 ---
**Author:** ![KaidoomDev](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kaidoomdev/32/977996_2.png) [@KaidoomDev](https://forums.unrealengine.com/u/KaidoomDev)\ **Post date:** [August 31, 2022, 4:10am UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781/3 "2022-08-31T04:10:49Z")
Thank you for responding. I’ve been looking in that section as well, from my understanding they use a line trace or a sphere trace which you can’t really incorporate radius and width as the same time. You can select what to go for in the ChaosVehiclewheel class, I don’t think shape cast is used though. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/b/b/2bbda79f9d3c1af2af0667faad0da026f187ebba.png) Here’s the result when using a simple ray cast trace, you can see the issue with the wheel on the right, from a line trace perspective everything is good. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/5/e/e/5ee35409c629d53334ecde3c0458247b3ee6201c.jpeg) Sphere trace solves the issue but you still get some situations like this with wider gaps. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/b/71bb295965d8057ffd1712838d74848a832322e2.jpeg) I think wheel width can only be used with something like a capsule trace perhaps. ---
**Author:** ![KaidoomDev](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kaidoomdev/32/977996_2.png) [@KaidoomDev](https://forums.unrealengine.com/u/KaidoomDev)\ **Post date:** [August 31, 2022, 4:29am UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781/4 "2022-08-31T04:29:27Z")
I want to correct one thing about sphere trace, this is mainly the issue you would face with a sphere cast, since the sphere sticks out more to the sides the wheels will hit the curb when driving near it even though it shouldn’t in regality. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/8/d/78df585b70d8c1d106083324548cb9f95edd7057.jpeg) ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/3/2/c32dfa090e8f607529823c8caff8c2fd3914f89c.jpeg) ---
**Author:** ![DGRWGRP](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DGRWGRP](https://forums.unrealengine.com/u/DGRWGRP)\ **Post date:** [June 26, 2025, 7:53pm UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781/5 "2025-06-26T19:53:02Z")
Hello there, Did you ever find a solution for this? I am having the exact same problem on UE5.2 and from what I’ve read online seems like the Shapecast for the suspension was never implemented by Epic. I haven’t found a way to solve it or implement it myself but maybe you or someone else did, if so please let me know. Cheers 🙂 ---
**Author:** ![KaidoomDev](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kaidoomdev/32/977996_2.png) [@KaidoomDev](https://forums.unrealengine.com/u/KaidoomDev)\ **Post date:** [June 26, 2025, 10:18pm UTC](https://forums.unrealengine.com/t/chaos-vehicle-wheel-width-has-no-effect/635781/6 "2025-06-26T22:18:39Z")
I haven’t looked at it since. I think you’d have to extend the plugin for example using 2 line traces in each side of the wheel instead of a sphere or a single line