Roller coaster wheel assembly

On a roller coaster, the wheel assemblies are the point of contact between the cars carrying the riders and the track rails.

His design consisted of wheels underneath the rails, keeping the train on the track rather than relying on gravity, which allowed more aggressive inclines and a more thrilling ride.

They are commonly wheels, but some older roller coasters or low-intensity, family focused rides may utilize a steel plate or bar positioned under the rails due to low forces.

Up-stop wheels keep the train from lifting off of the track while traversing hills that may provide negative g-forces, or through inversions.

Early Arrow Dynamics steel roller coasters oriented the side frictions wheels on the inside of the rails.

On inverted roller coasters, such as those produced by Swiss manufacturer Bolliger & Mabillard, the wheel assemblies are typically in the same configurations, despite the cars being positioned below the track.