cobalt

An impression stamp was used to mark the wheel so possibly mis-marked? I highly doubt it though. Hard to believe a mistake was made at this level. The 11's have a distinct part number if these are a different offset than the Cup rears than I would assume a different part number would be assigned at least the digit. These are clearly factory and are a matched set of 4 with same production dates and serial number markings. There are more QC inspection stamps on these than I have seen on the turbo 3.6 speedlines.


I would love to see a rear 9.5 from a cup car and see how they are marked. I will start another thread to see if we can get the bottom of this.

The 9's were ET 48 AFAIK

Bill Verburg

Yes, the 3.8RS Speedline 9 was ET48 & the 11 was ET5

Here's some pics of the 9.5 x17




I have an old CD test of an RSR they list 9.5 & 11.5 x18 for the wheels

cobalt

I don't believe an 11.5 x 18 speedline was made. Although most of the RSR's used BBS's and most likely were what was used on the CD test.

I started another thread in the Cup car section for those interested in following. https://rennlist.com/forums/porsche-...fset-info.html

Bill Verburg

The same info info was posted in CD and Pano in an artuicle by Jurgen Barth, the both actually printed 11.4" I took the liberty of changing to 11.5, could have been 11, who knows. The wheels pictured in both are Speedlines