1981
The CV27 had a Destroyer wheel.
The Scimitar & CV23 had the wood/plastic rim, chrome spokes with square holes and chrome cap.
The C500, C512, C537, Ski Machine & Intimidator all had the small black rim, black spokes with round holes and chrome center cap.
There aren't any good pictures of CVX18 Cal. Spl. or CVZ18, CVZ19 to see what they had.
C500, C512, C537, CVZ19 are listed as "Mechanical"
Ski Machine is "Duel Cable"
CVX18, California Special, CVZ18 are listed "Merc Power"
Intimidator, Scimitar, CV23 I/O, CV27 are listed as "Power Steering"