What is the bolt pattern on my '78 Electra?

[TPI78buick]

My '78 Electra 225 Ltd. is crrently at a friends storage shed in another state. I saw a set of rims online for sale that I want. I cannot get there to measure the bolt pattern so I need your help. What size bolt pattern do I have? Is it a 5x4.75 or is it a 5x5? Thank You.

[BNaylor]

Your post has been moved to the Electra forum.

Most likely the 5 X 4.75" or 5 X 120.65mm. Pretty standard for GM cars of that model and vintage.

[randy78]

hi there


there is no definite answer here


both patterns were used on B bodies and specifially on the electras of the 70s

electras were among the group of the largest RWD cars of their years, alongside the big caddies and so on

i had a '77 electra 403ci th350 and it had the 5 on 5" large pattern

i put chevy pickup rally wheels on it at one point so i could run the 31x10.50" A/T tires that were on them, for the snow

1/2" wheel studs

quick way to know the pattern without even measuring:

look at your wheel studs

if they are the big 1/2" ones then you have the 5" pattern

if they are the little 7/16" studs then you have the 4 and 3/4" pattern

these are the only two patterns used on all GM RWD 5 and 6 lug trucks and cars since at least the '60s and through the '90s

very simple

good luck

[BNaylor]

randy78,

Thanks for your input, however, please check the date and do not resurrect old threads per AF and our forum guidelines. See link below. This one is well over a year old. Thread closed.


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