Chrysler Crossfire
Hub rings

2, Hub center rings with 5 mm spacer:

When I bought my car it already had these after market wheels, looks very good to me. To have them to fit they had mounted a 10 mm spacer between the hub and the wheel. Little bit too thick, 7 mm had give a better match to the original wheels. I have a 5 mm spacer in my "things good to have box" and tested it earlier, couldn't feel very much difference. But if I want to use it I must have different hub center rings. I measure here what size I need.

Spacer's inside diameter:

This is how the 5 mm spacer look. It's too thin to have its own hub and the wheel connect to the car's own hub instead. The inner diameter is 77.1 mm, I need something to fill out that gap with (77.1 - 66.56) / 2 = 5.27 mm.

Hub's wideness:

First I measure how wide the hub of the car is.

I got it to 9 mm. That means I get 4 mm left of the original hub with a 5 mm spacer installed, little bit too small, the hub has a slant at the end also.

Hub's outside diameter:

The hub outer diameter is 66.56 mm. When looking at tables about Mercedes hub sizes I got 66.5, 66.6 and 66.56 mm diameter. With help from Chrysler forum I understand that 66.56 mm must be correct. A little bit strange, why do a German company use this strange size and not SI units ?

If I need to support the hub center ring with the outer end where the hub cap is it has the diameter of 63 mm.

I feel this will not be a good solution just to correct the small difference with this thin 5 mm spacer. The wheel offset difference is only 3 mm, normally it's said that +/- 7 mm is okay, but it depends on the car to some extend.

Reinstalling the wheels:

When I mounted the wheel again I was extra careful when I tighten the wheel bolts. Started with a tiny torque of the bolts, then started a new sequence and increased it and so on until I had the correct torque. That will get the wheel center better on the hub.