456 wheel fit

When I looked at this the rear offset was quite large and needed a spacer - like the 355 wheels do. A bigger challenge was the 10” width and weight of the wheel. As ever, I cant find my notes but I’m sure the wheel was heavy and so offered greater impact on handling. Sorry not to be more (at all) precise. Hopefully someone with a set ‘on’ can tell you they work fine.... as for bolts, I didn’t think they worked either, but I gave up the math when dealing with the spacers and weight issue anyway.


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Ps. Greg, I think the spacer was as much to clear the rear shock, as well as fill the arch.


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what are the specs of the 456 wheels? Offset, sizes etc.

 

A quick search revealed that 456 all years were


456

F 17x8.5 ET 50
R 17x10 ET25


360

F 18x7.5 ET 28
R 18X10 ET 30


We all know that 360 wheels are common and known to fit on Mondials so using those for comparison ....

Starting with the rears. 5MM is just a touch over 1/4" So since the 456 and 360 rears are the same width, 5mm less offset means that the outer edge of the 456 wheel would be just over 1/4" further out towards the edge of the rear fender. Pretty much a non issue.

The fronts have almost a 1" difference in the offset, but also have a 1" difference in width 360 vs 456. Recall that offset is the space from the centerline of the wheel to the mounting flange/surface of the wheel.

So the greater offset of the 456 wheel basically means that the entire wheel is pulled closer to the inside or centerline of the car approx 1". But since the 456 wheel is 1" wider you recover 1/2" because of the wider wheel width. As such relative to the outside edge of the front fender a 456 wheel would be approx 1/2" further inside the fender than a 360 wheel which we know fits. The issue on the front would be with the larger width and offset could there be clearance issues on the suspension?