Determining wheel size

[myslateblue911]

I have a set of 15" wheels on my 83' SC. I believe they are 7's & 8's. How can I confirm that I am correct on that assumption?

[AG81]

^
Measure them.....

[darrin]

if they're fuchs, they should have Porsche part numbers (and size markings) on the insides of the spokes -- other wheels (even aftermarket) should have similar markings -- pull a front and rear wheel and look what they show from the inside

[darrin]

Originally Posted by AG81

^
Measure them.....

AG81 -- good point, but seems that would be difficult to accurately do if they already have tires mounted --

[Bill Verburg]

Originally Posted by myslateblue911

I have a set of 15" wheels on my 83' SC. I believe they are 7's & 8's. How can I confirm that I am correct on that assumption?

Back of the spokes

If they are Fuchs




measure if not

this is a 7


this is a 6


wheels are defined by the bead width not overall width


If tires are mounted use rubber bands to hold 2 laths that rest on the wheel flanges, measure the distance between laths and then subtract the width of the 2 flanges, for Fuchs you would subtract .7, most modern wheels have .5" flanges so subtract 1", BBS is an exception subtract .8