Are Steering Wheel Knobs Illegal?

Steering wheel knobs are not strictly illegal in any of the 50 states. However, some states impose limitations on using them if their design poses a potential safety hazard such as catching on clothing.

Are steering wheel knobs (aka wheel spinners) expressly forbidden to use on LLVs? : r/USPS

First time I've seen a suicide knob on a car this modern. '15 Merc S550. : r/Justrolledintotheshop

Are Steering Wheel Knobs Safe?

1950s 'Suicide Knobs

Practical Steering Spinner Set: the package comes with 2 packs of steering wheel knob spinners, well polished with smooth surfaces, providing you a

2 Pieces Steering Wheel Knob Spinner Suicide Knobs Steering Wheel 360 Degrees Rotation Tractor Accessories for Cars, Trucks, Tractors, Boats, Golf

Steering Wheel Suicide Spinner Truckers Knob w/ Quick Release Sport : Automotive

Steering Wheel Suicide Spinner Truckers Knob w/ Quick Release Sport : Automotive

Was anyone ticketed for a steering wheel knob?

Why are suicide knobs called so?, Page 3

2 Pieces Steering Wheel Knob Spinner Suicide Knobs Steering Wheel 360 Degrees Rotation Tractor Accessories for Cars, Trucks, Tractors, Boats, Golf Carts (Black) : Automotive