How do u measure backspacing on wheels

Just make sure the new wheels and tires fit inside the fender without rubbing anything. The only way to know for sure how much the new offset will affect scrub radius is to put the car on an alignment rack.

If clearance is that tight, the tech must take extra care when placing the wheel weights. Usually the drop center is toward the outside of the wheel, so the wheel is placed outside up on the tire changer. But some aftermarket wheels have the narrowest part of the drop center toward the inside of the wheel.

These must be placed on the tire machine inside up. Finally, make sure your techs tighten the lug nuts with a properly calibrated torque wrench every single time!

Uneven lug nut torque is almost guaranteed to cause warped brake rotors within a few thousand miles. Finally, remind your customers to come back after five to 50 miles to get re-torqued. Some OEMs use this adjustment to set scrub radius on vehicles that are sold with different wheel size options. Closely related to offset is the concept of backspacing. Offset and backspacing are often spoken of as if they are the same thing, but they are very different.

Backspacing is defined as the distance between the mounting plate and the inner flange of the wheel. Backspacing is, therefore, the combination of the offset and the wheel width.

This comes into play if the new wheels are wider than the old, as the offset may need to change to compensate for the greater width.

He joined the magazine in as assistant editor, and had been responsible for gathering statistical information for MTD 's "Facts Issue" since He won numerous awards for editorial and feature writing, including five gold medals from the International Automotive Media Association.

Bob earned a B. Raw Material Prices Continue to Increase. Home » Wheel Offset Basics. No Comments. Order Reprints. Now we have everything that we need to calculate offset. Offset is simply the distance from the hub mounting surface to the center of the wheel.

Note: Pay attention to the minus sign here. If the backspace measurement was larger than the wheel center distance, then the hub mounting surface would be to the outside of the wheel center, and the wheel would have a positive offset. Now since offset is conventionally expressed in millimeters, we just need to convert —.

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