30 spoke rims made for the 1983 and 1984 cadillac eldarado by the Cragar Wheel company. The 83's (3's) are made for the rear wheel drive eldarado. In 1984 Cadillac switched to a Front Wheel drive layout for the eldarado so the offset changed, making 84's (4's) poke out more. 3's and 4's are often seen on slabs (older american "big body" cars) in combination with Whitewall tires or Vougue Tyres (mustard mayo tires)
See also: 30's , Thangs, Swangs, or elbows.
On the boulevard got my swangers on hard. Comin down the boulevard swangin on 'em hard.