What is a Tie Rod End?

A tie rod end has a threaded end on one side and a socket joint on the other. It connects the tie rod and the wheel assembly.


Steering Wheel to Wheel

A tie rod is a system that connects the steering mechanism and the wheels. There are several types of steering linkages but all of them involve tie rod ends in one form or another. Some use a drag link that connects to a bar with tie rod ends on each side that in turn connect to the wheels, others have an inner and outer tie rod end connected to the outer wheels and a rack and pinion system in the center. In all cases the tie rod ends are essential for controlling a vehicle and when they become worn down or damaged then turning or even maintaining a direction can be difficult.

diagram of a tie rod end
diagram of steering linkage

What does a Tie Rod do?

The main function of the tie rod is connecting the steering to the wheels, but it also plays a role in keeping the wheels in alignment. In addition to this, the tie rod ends also provide some flexibility in the steering so that the bumps and jolts that the tires experience on the road are cushioned on their way to the steering wheel.

The downside to this is that the tie rod ends are constantly absorbing those bumps and can begin to wear down and loosen over time. On top of this every time the steering wheel is moved those joints are being engaged, adding to the wear and tear that these parts go through.