Wheel what does et mean

Therefore if you have a 10in wide wheel the center line is 5 in from either side. You can see the center line in all the pictures below illustrated with a dotted line. The hub mounting surface is the part of the wheel that will physically be bolted to the vehicle. This is generally mounted to the brake rotor or hub, thus the name hub mounting surface. On the left illustration below you see 2 red arrows. This depicts where you would measure offset. Therefore in the left illustration the measurement from the center line dotted line to the wheel mounting hub is 40mm.

Often times you will hear people mention that that which is ET So now we know that the 45 is distance in millimeters between the center line and hub of the wheel, but what does ET stand for? ET is an abbreviation for the German word Einpresstiefe meaning offset. Ok that all sounds great right, but how does offset change how wheels will look on a car?

Look at the following diagram:. There are a number of myths surrounding wheel installation which are often mistakenly assumed as facts by unaware drivers. Here we will try to verify the key points addressing most common questions we hear when replacing car wheels.

We mustn't generalise here - each case of wheel offset change should be considered on an individual basis. For example, when using a wheelbase of cm, an acceptable change will be 3. This results in a maximum allowed offset change of 16 mm per side provided that the width of the wheel and tyre size will not be changed. Individual cases should also consider how much space the car manufacturer has assumed between the wheel arches. Any offset change, or change to the wheel width, could cause the wheels to rub against this arch, especially when under a heavy load.

Increasing the offset then, may also cause the risk of the wheel rubbing with the car brake calipers. Therefore, when planning any ET changes, the standard distance between the wheel and any crucial points of the vehicle should be carefully investigated. This includes the edges of the wheel arches, brake calipers, MacPherson struts and other nearby components. 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 Anyway, to calculate the ET of a wheel, you merely need to measure its overall width, which allows you to find the centre point. Then, you measure from the mounting face - where the wheel meets the hub - to the rear edge of the wheel.

Now all you need to do is subtract the backspacing value from the centre point figure, et voila: you have your offset figure. If the centre point and backspacing values are identical you are - as keen maths enthusiasts will point out - left with an ET of 0, meaning the wheels are not offset.

We often get questions about the offset of a wheel. The offset of a wheel is indicated by the ET-value, which comes from the German word Einpresstiefe. Selecting the correct wheel is essential in preventing damage during use. Wheel construction Determining the ET-value is related to the technology, the structure of the truck wheel.

Position above the wheel bearing In order to determine the ET-value of the wheel, we therefore look at the cross-section of the wheel. Rim inner surface In practice, the ET-value is the number in millimetres that the centre line of the wheel deviates from the mounting surface on the wheel hub. Like to know more? We use cookies Our websites use cookies.