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Why you should put new tyres on the back axle of a car (when you have 2 new tyres)

You order two new tyres and you are advised to put them on the back axel, has this ever happened to you?

 

Well the reason for this is because of over steer and under steer. So what are over steer and under steer?

Well lets start with under steer, this happens when you turn your steering wheel but you do not turn (lets say to the right) as much as you have turned the wheel, the car seems to 'plough on' forward. The reason for this is the amount of forward momentum is greater than the grip of the front tyres, thus you seem to keep going straight on.

 

Over steer is when you are going around a corner and the grip on the rear tyres is not enough to stop the tyres breaking traction and thus the rear of the car starts too slid around towards the front of the car.

 

So why put the 2 new tyres on the back to stop over steer as against the front to stop under steer? The reason is grip. Over steer is harder to handle than under steer. With under steer you will normally just scrub speed off by the fact that the tyres are sliding forward. With over steer you can easily lose control of the car and go into a spin unless you know how to control it. This is often called steering into the slid. If you have ever seen top gear where they are 'hanging the tail out' as they come around the corner you will see that even they sometime lose it and spin out on the track. Now this is in a controlled environment on a wide track with no other car or trucks around and no street furniture (like street lights). Imagine spinning on a busy road with pedestrian and lamp posts around.

 

So now you know why we recommend that if you are having 2 new tyres that they are put on the rear axel of the car.

Call Hometyre on 0800 783 93 10 and we will come to you.

 


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