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bolt pattern for cutlass

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86_olds
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bolt pattern for cutlass

Postby 86_olds on Sat Jun 12, 2010 11:42 pm

am thinking maybe some cragars super sport or cragars blase 330 (15x8) in the back but i would like to know my bolt pattern are they and what website would you guys recommend buying them i know summit racing has em and i have also heard that u need a spacer is that right ?

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Re: bolt pattern for cutlass

Postby 85GPLef41 on Sat Jun 12, 2010 11:48 pm

Bolt pattern is 4.75 as for the spacer i wouldn't know.
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86_olds
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Re: bolt pattern for cutlass

Postby 86_olds on Sat Jun 12, 2010 11:51 pm

so would these fit am not to sure on how to check the bolt pattern http://www.summitracing.com/parts/CRR-3305812/
i think these are 5 x 4.50

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Re: bolt pattern for cutlass

Postby 85GPLef41 on Sun Jun 13, 2010 12:21 am

kris_tol wrote:so would these fit am not to sure on how to check the bolt pattern http://www.summitracing.com/parts/CRR-3305812/
i think these are 5 x 4.50

No those wouldn't fit but you could probably find some in the correct 4.75 SAE or 5x120.65 Metric bolt pattern. I bought a bolt pattern tool for 3 bucks at the swap meet. It's a plastic wheel with the different pattern stamped on it. You could probably find one in SAE and Metric patterns.
1985 Grand Prix L.E."Pro-touring" car:
5.7 LS1 99 Formula TA ,T56 six speed, 8.5 Buick 3:42 GN posi rear, 78 LeMans Aluminum core support,front 13in early C6 brakes & rear C5 calipers with 12in LS rotors, 18x8 front 18x9.5 rear Boss 338 wheels, Nitto nt555 tires, Hotchkis coils and rear control arms etc etc...ALL IN PROGRESS. Coming soon 408 stroker!!
build thread:
https://gbodyforum.com/viewtopic.php?f=69&t=36477
my pics:
http://s387.photobucket.com/albums/oo316/netochingon1/

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Re: bolt pattern for cutlass

Postby joe_padavano on Sun Jun 13, 2010 7:10 am

kris_tol wrote:so would these fit am not to sure on how to check the bolt pattern


The bolt circle is simply the diameter of a circle that passes through the center of all of the wheel studs.

http://www.tirerack.com/wheels/tech/tec ... ?techid=92
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Re: bolt pattern for cutlass

Postby jrm81bu on Sun Jun 13, 2010 1:25 pm

joe_padavano wrote:
kris_tol wrote:so would these fit am not to sure on how to check the bolt pattern


The bolt circle is simply the diameter of a circle that passes through the center of all of the wheel studs.

http://www.tirerack.com/wheels/tech/tec ... ?techid=92


No, on a five lug pattern you measure from the outside of one lug to the center of the one across.
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Re: bolt pattern for cutlass

Postby beermonkey9417 on Sun Jun 13, 2010 3:52 pm

its 5 lug by 4.75 or 4 3/4, good luck with yer new rims, and post pics!
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Re: bolt pattern for cutlass

Postby MrHernandez on Sun Jun 13, 2010 4:39 pm

Check wheelsforless.com I got a set of black and aluminum ION 16x8's for a bit more than $500 and free shipping AND THE BOLT PATTERN IS 5x4.75
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Re: bolt pattern for cutlass

Postby joe_padavano on Mon Jun 14, 2010 9:28 am

jrm81bu wrote:
joe_padavano wrote:
kris_tol wrote:so would these fit am not to sure on how to check the bolt pattern


The bolt circle is simply the diameter of a circle that passes through the center of all of the wheel studs.

http://www.tirerack.com/wheels/tech/tec ... ?techid=92


No, on a five lug pattern you measure from the outside of one lug to the center of the one across.


That is an expedient way to get close to the bolt circle on a five lug wheel. Again, it's called a bolt CIRCLE for a reason... it's the diameter of a CIRCLE that all the bolts (or wheel lug holes) are centered on. If you have an even number of wheel lugs, then two opposite ones give you a diameter. There are no opposite ones with an odd number of lugs. I am constantly amazed that people find this such a hard concept to grasp.
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Re: bolt pattern for cutlass

Postby jrm81bu on Mon Jun 14, 2010 9:34 am

joe_padavano wrote:
jrm81bu wrote:[quote="joe_padavano]The bolt circle is simply the diameter of a circle that passes through the center of all of the wheel studs.

http://www.tirerack.com/wheels/tech/tec ... ?techid=92[/quote]

No, on a five lug pattern you measure from the outside of one lug to the center of the one across.[/quote]

That is an expedient way to get close to the bolt circle on a five lug wheel. Again, it's called a bolt CIRCLE for a reason... it's the diameter of a CIRCLE that all the bolts (or wheel lug holes) are centered on. If you have an even number of wheel lugs, then two opposite ones give you a diameter. There are no opposite ones with an odd number of lugs. I am constantly amazed that people find this such a hard concept to grasp.[/quote][/quote][/quote]


If you measure from the center of the the studs on our cars you won't come up with 4.75. It's called a bolt pattern not a bolt circle. Go back and read the link you posted. You have to go from the outside edge to the center of an opposing stud or you will have the wrong measurement. On four lugs you go from outside to outside, so if you used center to center it would be wrong also. I don't have a problem understanding this at all.
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Re: bolt pattern for cutlass

Postby joe_padavano on Mon Jun 14, 2010 12:08 pm

jrm81bu wrote:
joe_padavano wrote:
If you measure from the center of the the studs on our cars you won't come up with 4.75. It's called a bolt pattern not a bolt circle. Go back and read the link you posted. You have to go from the outside edge to the center of an opposing stud or you will have the wrong measurement. On four lugs you go from outside to outside, so if you used center to center it would be wrong also. I don't have a problem understanding this at all.


Actually you do. You need to go back and read the part in the link that says "NOTE: When measuring a 5-lug wheel the measurement is only an estimate". Also note that the picture shows a CIRCLE inscribed in the center of all five lugs. The diameter of that circle IS the bolt circle, which is 4.75" for an A/G body car. Since most people don't own a wheel gauge, the linear measurement shown is a method to get close. There is enough difference between 4.75" and 5" bolt circles that you can use that method. There is NOT enough difference between 4.75" and 120 mm, however, for it to be used.

Edit: The following is from the American Racing Wheels website. I would guess that they know what they are talking about:

"The bolt pattern or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs."

http://www.americanracingwheelsinfo.com ... attern.htm
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66 442 conv
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69 442
70 W-30
72 442
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Re: bolt pattern for cutlass

Postby jrm81bu on Mon Jun 14, 2010 7:30 pm

Look at the picture again in you first link again. I will agree that the measureing line does intersect the bolt circle. However the point that they intersect is betwwen two of the lugs. That is a point that you cannot measure. That is why you go from the outside of one the the center of the other. Also note that that same pic show measurinf from the outside to the center of an opposing lug, just like I've been saying.
If you so sure that the center to center measurement is the bolt pattern a g body takes, go measure your own vehicle and start scratching your head when it comes in at 4.5 give or take a 1/32". The 4 3/4 pattern comes from that measurement plus half the width of the stud which with 7/16 studs is an added 7/16. This will give you around 4 23/32(or 4.71875) which is why the call 4 3/4 an estimate.
If the correct way to measure a five lug pattern is center to center, we would all be running ford rims. :roll:
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Re: bolt pattern for cutlass

Postby jrm81bu on Mon Jun 14, 2010 7:41 pm

How bout this Joe. The bolt circle(that runs through the center of all the studs) measures 4.75. However you can't measure the diameter because you have no reference point accross from any given stud to measure. The next best thing is to measure from the outside of one stud to the center of an opposing stud. But that is still not the center of one stud to the center of another, that won't give you the right measurement because it is not the diameter of the circle since it does not cross through the center of the circle.
81 Malibu
400(350 for now) 142 supercharger
700r4
3.73 posi 7.5


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