6x5.5
8-6.5
Standard 8 bolt.
A 2015 GMC 2500 has a 8 on 180mm rim bolt pattern. The dually 3500 has a different 8 on 210 bolt pattern.
Bolt pattern for a 1985 GMC Sierra Classic 1500 is 6x5.5 (That is what mine is)
The rim bolt pattern is 8 on 6.5inch.
gm4 3.67
6x137.5
6x5.5
That bolt pattern is an 8 bolt pattern.
5x5
8x6.5