Quote:
Originally Posted by Racer Boy
The backspacing is the number flowing the wheel dimensions that are stamped on the wheel; 7.5J x 18 is the width and diameter of the wheel, the following number (ET 50) is the spacing.
The spacing on your rear wheel (original) is 52mm, the new wheel is 65mm. That means the new wheel will be 13mm closer to the center of the car. Thus, 15mm spacers will bring it back out to near the original spacing.
One other thing to consider is that the new wheels are wider. If the original wheels had the tire near rubbing, then adding width will make it worse if the new wheels have the same spacing.
Hope this makes sense, and helps!
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You also need to take width into account. A 10" wide wheel with 50 offset will have less clearance than a 8" wide wheel with the same offset.
To answer your question, for the rear you'll actually need about a 25mm spacer to maintain stock clearance. According to this calculator, your new rear wheels have 26mm less inner clearance. Whether or not you could get away with a smaller spacer I couldn't say, however.
https://www.1010tires.com/Tools/Wheel-Offset-Calculator#