Hello I have a 1978 old ms delta 88 royale 2 door. Can anyone help me by telling me what’s the right size rim to mount and lug size Thanks

 

Unfortunately, it depends. Standard equipment used a 5 x 4.75" bolt pattern with 7/16" studs. Cars with the optional HD brakes and suspension used a 5 x 5" bolt pattern with 1/2" studs.

 

Joe, didn't all 77-85 B/C bodies use a 15" x 7" rim regardless of lug pattern? The OP might want to know that 4" backspacing and 0mm offset are what he should look for if he wants aftermarket wheels.

 

I put some 14” cutlass rims on my delta. There to small and it caused a rim to fall off. Do I am now looking for what the exact tire I need to use.

 

Also I’m just looking for some oem sized wheels. Aren’t they 15x6? And can anyone tell me what lug studs to get as well? I believe there 7/16

 

My 1985 Deltas have 15x6 wheels. My B-body wagons came with 15x7.

 

>>>I put some 14” cutlass rims on my delta. There to small and it caused a rim to fall off. Do I am now looking for what the exact tire I need to use.

ouch thats sucks

if the rims fit on the studs then the bolt pattern is correct 5x4.75 as joe mentioned above (Standard equipment used a 5 x 4.75" bolt pattern with 7/16" studs.)

the rim may have fell off due to the wrong lug nuts, the lug nut needs to fit the stud hole taper to prevent it loosening up.

The overall tire diameter may have been smaller than typical but thats not why the rim fell off.

 

check here for more info on the correct tires and sizes

https://classicoldsmobile.com/forums...5/#post1326427