This is a gear motor attachment for arduino robot car. 3d printable stl file attached. Accurately designed clamp. If you want you can use spring for suspension of the wheel. But I did not use spring because I don't have the spring. STEP file format also attached, so you can edit it as you want. It has holes to attach the motor. Length of the bolt with the spring depend on the spring size and tensions.

Here is the gear motor link:https://www.amazon.in/Electronic-Spices-Shaft-Motor-Plastic/dp/B08RS48GQD

Custom size and design possible. Please contact with me for more details.

Thanks,Mahbub