Wheels what does et stand for

You will find this type of wheel ET in rear-wheel drive cars, especially powerful ones. You should be able to find the ET value of your wheel stamped on the wheel itself. The ET indicates the millimetres that can be measured between the mounting surface and the symmetry axle of the wheel, considered the geometric centre.

The lower the ET value, the further out your alloy wheels will stick out. In contrast, the higher the ET value, the deeper under the wheel arch your wheels will be. One thing to bear in mind is that the offset is not an exclusive factor to decide the location of the wheel. For example, even if the ET value is 30 ET30 for both a 9-inch and a 6-inch wheel, the larger wheel will stick out further. It has been made and designed to work in complete unison, a well-oiled machine where one minor adjustment can have a huge impact on other parts.

Such a simple thing as changing the tyres of your car can affect the way it handles, so logically, changing the wheel ET of your car, can have major impacts. But, more importantly, getting it wrong can cause major disasters. If you get the offset wrong installing new wheels, you run the risk of having the wheel sit too deep inside the wheel arch. What can this cause? It can cause the inner edge of the wheel to rub with the suspension.

This will damage the inner side of the wheel and to the suspension. Detecting damage in this area is very difficult, until it is too late. Therefore we can see that as the offset increases the wheels will come in under the vehicle further. The calculation goes in the other direction this time.

If the original wheel is ET 51 and you change to an ET 70 your wheels will sink into the vehicle by 19mm. When you start to change both the width and the offset there are more complicated calculations. Here is a pretty good tool that will calculate inner wheel clearance as well as outer wheel position, when changing the width of your wheels. We really hope this was helpful in explaining how wheel offset works. Thank you for reading.

Home Articles Wheel offset explained in plain English yup pictures too. Wheel offset explained in plain English yup pictures too. What is ET? Share this post. About the Author. XXR 18x8. XXR 15 X 8. Call us on My Cart Items: items Value:. View Cart Checkout. While aftermarket wheels are made in multiple offset modifications, most OEM wheels come in the offset appropriate for a given vehicle model.

Most wheels in today's cars are installed with positive offset. It does not matter whether you have alloy or steel wheels. The wheel must be located in the very same place, so the material does not often come into consideration.

However, when changing from steel to alloy models, it is often noted that steel wheels are narrower than alloy ones. This usually implies making fitting adjustments for wider wheels, which also means modifying other values. Renault recommends standard wheels with a inch diameter, 6-inch width and ET Here the question is whether wheels with a inch diameter, 7.

If we use these values in the formula presented above, the causes an increase in width by The front wheelbase is mm, which means an extension of From these calculations, these wheels cannot be recommended for this particular vehicle. You want to know how to measure wheel offset? An appropriate offset value can be easily calculated to keep the wheelbase unchanged. To do this, simply use the formula presented below. Enter the parameters of the factory wheel and the width of the new wheel.

The resulting value shows which ET is appropriate in this case. When analysing them, consider any potential changes between your summer tyres and winter tyres as well. The guidelines of a German entity are not legally binding on English markets, but they are worth paying attention to. The installation of sports suspension systems , for instance, typically lowers the vehicle by around mm, which usually requires narrow tyres with alloy wheels.

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