I’m under the understanding that the Colorado and Trailblazer have a 6 by 5.5 pattern. It’s expressed in metric terms sometimes.
Yep, later trucks and cars (newer than 1999 as my F250 is metric) use metric patterns. 6 on 139mm is close to 6 on 5.5 inches. But not really close enough that the wheels for earlier vehicles will fit right. Someone is going thru an issue like that on a disc brake swap right now.
