The wheel has "zero offset" when the mounting pad position is in line with the position of the centerline. With the declared positive offset of 40, the wheel's mounting pad is located 40mm from the center line, towards wheel's front face, being 40mm from the center line position which is at This means that the mounting pad location measures These measurements refer to the shortest distance between measurement points. A wheel that has a positive offset or greater backspace has to slide further into the wheel well to be mounted, it's closer to the brakes and the suspension of a car.
Similarly, the one with a negative offset or lesser backspace will tend to jut closer, or even beyond the fenders. Of course we want to push the wheels out, but not too far.
To add an adaptor to the measurement, simply add the thickness of the adaptor to the clearance factor of your new wheel. Using a 15mm adaptor, we ended up with a total estimated clearance of This is 4mm under our total clearance to the fender.
This calculator is only meant to get you started. There are several limiting factors that come into play when pushing the limits of wheel fitment. Just because the math looks right doesn't automatically mean they fit. Here's a few factors to consider:. Realistically, we cannot help you with any of the six fitment aspects listed above. Throughout our website we have given you an excess of technical information to help with your wheel conversion. In the end, the aspects of your unique vehicle and prospective wheels determine the success of your fitment.
We can guide you, but we can't make the final decisions. We suggest searching the internet for people who have installed the same wheels. Google has a wealth of information. Search the forums and don't be afraid to ask for help! Wheel offset is commonly known as ET, an abbreviation for a German word meaning "press depth.
Many people don't know the difference between a positive and a negative offset. They see ET50 and think due to something they read online. If in doubt - always ask for pictures of the offset stamp and the back of the wheel.
New Wheels Now the fun part Here's a few factors to consider: When measuring for total clearance, it's best to take these measurements at the same ride height you plan to use the new wheels.
Are you looking at a set of coilovers? Lower it before you buy the wheels. Although this method should produce an accurate measurement at any ride height, it's highly recommended to measure at your final ride height. On the topic of ride height - how low are you planning to go? It's tough to lower a car 4" over a 10" wide wheel without sitting the fender on the tire.
Be realistic. If you want to go wide, you can't go low without rubbing hard. If you want to lower it to the pavement, you can't go wide. Pushing the limits of wide and low is why we do this, but there are limitations. Suspension geometry pays a major role in wheel fitment.
Wheels don't just gracefully float up and down in the body when you hit a bump. The following table shows all the possible shapes of a passenger car wheel rim interior. While they can still be found in trucks, vans and agricultural vehicles, they are not used in any passenger car any more.
As such, you are highly unlikely to come across them for your own car tyres and wheels. For the purposes of information, we will still present you with their shapes so that you can have a basic idea of the profiles discussed.
Apparently, the code engraved on your car wheels isn't that mysterious. If you know what the symbols mean, you can easily find out all you need to know to have the perfect tyres mounted.
As long as you know what size and profile your car wheels are, you can use our website to choose the best tyre sizes.
Choosing an ideal set for your vehicle and driving style is only a few clicks away. Terms and conditions Delivery costs Delivery time. Site map How cookies are used Registration of a new fitting station For media.
You will find drivers using tyres bought at Oponeo all across Europe. Click on a flag to visit our foreign web-shops. Click if you live in Ireland. Tyres Wheels Customer guide. Alloy wheels Steel wheels. In contrast, too much positive offset is a danger, as it will push the wheel farther in toward the suspension.
But going from a 20 mm to a 45 mm offset not only may destroy the tires, but also has the potential of affecting vehicle control and injuring the customer — not an optimal customer service outcome! Finding the actual offset designed into the car is key to the whole process of matching new wheels. Even when your customer is looking to put OEM wheels from a different model by the same maker onto his or her car, you cannot count on the offset being the same.
BMW in particular is notorious for having a dizzying variety of different offsets across its model lines. Some cars will even have different offsets for front and rear axles; BMW again being notorious for this.
The site also boasts an enormously useful Match Calculator, which will give a list of other possible wheel fitments for any given model. Most wheels will have their offset embossed on the back of the wheel, either on the mounting plate itself or on the back of one of the spokes. If the offset is not printed, as with unmarked aftermarket wheels whose history is unknown, measure the offset yourself. Place the wheel on its flanges on a flat surface, and put a paperclip on the string to make it hang straight.
Then place a ruler flat against the mounting plate and see where the string crosses the ruler. Measuring backspacing is, of course, much easier, as it only requires a ruler and a straightedge across the back edge of the wheel.
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