Porsche 935 - 19" BBS Motorsport Wheel & Tire Sizing Help

[KellerAve]

I have a set of 19" BBS Motorsport wheels for a 935 project I am working on that has left me stumped.

I attempted to mount a set of tires (345/35/19 Hoosier R6s) which seem to be too big in diameter, as though the wheels are actually 18.5s or so. Is this an issue anyone else has encountered?

I have another set of 19" rears that worked with the exact same tire with no issues.

Here is the wheel in question:




Here is how it compares (left) to my other set of 19" BBS Motorsport wheels (also E52s, 20-hole, etc)



Lastly, here is a stamping on the outer rim half, which reads:

BA 6 1/4 x 19 S
Made in W. Germany



So I believe the wheel to be a 19... although in comparison to the other wheels I have, it seems small. Do some of these rim halves require special tires? These are bolt-bead type wheels, versus my other set being a typical beaded lip/inner.

Any thoughts or advice would be greatly appreciated.

Thanks
KellerAve