Identifying size for 18-inch Turbo wheels (Technologie wheels): General
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Identifying 18-inch Turbo wheels (Technologie wheels / hollow spoke wheels) with the dimensions 9J x 18 RO 52 and 10J x 18 RO 65 (RO = Rim Offset) is only possible when the wheels are disassembled.
These wheels can also be fitted on the 911 Carrera (993) and the Boxster. .
The basic difference between Turbo wheels (Technologie wheels / hollow spoke wheels) and Turbo Look wheels (Turbolook Design wheels) is their valves:
Turbo wheel: screwed-in steel valve
Turbo Look wheel: rubber valve