Thursday, Jul 28, 2005 at 17:48
The measurement your talking about (the "y" distance) is known as the 'Backspace'. This dimension is independant of rim width.
Both dimensions are critical when choosing rims that will allow for the biggest possible tyres for your vehicle set up, with the best clearance to the inner and outer guards, brakes, chassis, etc.
OFFSET = The dimension between the mating face and the centerline of the wheel.
BACKSPACE = The dimension from the mating face to the back of the rim.
Given the rim width and either dimension, the other dimension can be calculated.
It comes down to how you (or the manufactuer) choose to describe the rim. The Yanks tend to use Backspace and Aussie manufacturers seem to prefer Offset.
That said, if a 6 inch and a 7 inch rim have the same 'Backspace' then the 'Offset' would be approx 13mm (1/2 inch) more on the 6 inch rim.
One manufacturer's "16x7 Hilux" rim is not always the same as another's. You can often get better clearance on a bigger tyre if you get your offset/backspace right. It may come down to woking out what your ideal offset is and then trying to find the closest match in the right stud pattern.
So what measurement did you come up with?
also- Were the wheels genuine stockies or aftermakket mags?
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