Positive offset means that the mounting surface is closer to the face of the wheel while negative offset describes the mounting surface situated towards the back of the wheel.
Zero offset refers to the mounting surface being lined up with the centre line of the wheel. It's crucial to apply the correct wheel offset because too much positive or negative offset can cause damage to the vehicle, especially when driving at greater speed. It might even cause a tyre burst in the end. When the ET value decreases, the alloy wheels will protrude further out. An increased ET value, on the other hand, results in moving the wheel location deeper into the wheel arch. However, the offset is not the only factor responsible for the location of the wheel against the wheel arches.
For example, although it still has the same offset of ET30, a 9-inch wide wheel will protrude more than a 6-inch wheel. 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. What is Wheel Offset? Zero wheel offset is when the hub mounting surface is in line with the centerline of the wheel. Positive wheel offset is when the hub mounting surface is in front more toward the street side of the centerline of the wheel. Most wheels on front-wheel drive cars and newer rear-drive vehicles have positive offset. Negative offset is when the hub mounting surface is behind the wheel centerline.
Getting them wrong can mean big problems. Call us on My Cart Items: items Value:. View Cart Checkout. Will My Wheels Fit. Another example. What is wheel Offset?
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