The original rim/tire combination is still in the trunk of my 1999- SL500 w/the "SPORT" option:

Tire: Michelin Pilot SX 245/45 R 17. 95W,MXX3,tubeless.

Rim: 8 1/4Jx17H2,ET 34, #A1294011302,"SPARE WHEEL ONLY". Sticker on the rim states:"50 MAX MPH".

"Sport" option on SL500: P245/40ZR18 front & P275/35ZR18 rear.