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Username Post: CHEVY BOLT PATTERN        (Topic#53695)
RICK`S SS 
Member
Posts: 54

Loc: United States
Reg: 11-16-03
12-31-03 05:45 AM - Post#364253    

WHAT IS THE CORRECT WAY TO MEASURE THE BOLT PATTERN ON A IMPALA 1964. I MEASURED THE STUDS FROM CENTER TO CENTER AND GOT 4 1/2 " BUT I DONT FIND ANY LISTINGS FOR THAT , THEY ARE ALL 4 3/4" WHATS UP.IF IT IS A CHEVY WHEEL WILL IT FIT ANY CHEVY????
THANKS RICH
Ricks`s SS
68 corvette T-Top 4 speed
64 malibu 283 4 speed


 
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wskaiser 
Senior Member
Posts: 115

Loc: Austin, Tx
Reg: 06-03-03
Re: CHEVY BOLT PATTERN
12-31-03 06:43 AM - Post#364254    
    In response to RICK`S SS

Don't measure from center to center. Hook the tape over the outside edge of one stud and then skip one stud and measure to the center of the next stud. Main thing it to have only one stud between the two you are measuring. It seems stupid but that is the way they are measured.

 
doubleE 
Valued Contributor
Posts: 3778
doubleE
Loc: Eagan MN
Reg: 06-02-03
Re: CHEVY BOLT PATTERN
12-31-03 10:03 AM - Post#364255    
    In response to RICK`S SS

I guess I have to disagree with wskaiser. Maybe that measurment does turn out to be 4 3/4", don't know as I never measured it that way, but...

Its the Bolt Circle Diameter in question. Since there are 5 studs, no two are directly across from each other making it difficult to measure since the diameter is the measurment of a stright line from one side to the other and passes through the center of the circle. Measuring from one stud to any other will not give you the right answer. So you have to imagine a circle that goes through the center (not the outside edge) of each of the 5 studs (or the center of the holes on the wheel) The diameter of this imaginary circle is 4-3/4".

This was the standard bolt circle for full size Chevy passenger cars and most other GM cars for many years. Not sure what bolt circle today's fwd cars use.

Eric
Proud owner of My Blue 62 Impala SS


 
DonSSDD 
Silver Supporting Member
Posts: 5115
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
Re: CHEVY BOLT PATTERN
12-31-03 10:45 AM - Post#364256    
    In response to doubleE

I found out in looking for 15 inch steel wheels that the junkyards here measured them one way which was different from the correct way, which is the way DoubleE says.
My 4 3/4 inch was their 4 1/2 inch. I learned to ask for the "big Chevy car 5 bolt pattern".

What I did was trace the correct bolt pattern on a piece of cardboard and take that with me to get wheels. The 4 1/2 inch backspacing is also an important measurement when you are looking for wheels. THe backspacing will determine how big a tire you can fit in the wheel well, among other things.

Don
62 Bel Air SC, 59 El Camino (sold), 62 Bel Air SC(sold in Finland is 2011), 63 SWC Vette (sold)
Member #2194
The pic in my Avatar is a Corona Cream Loaner, a buddy wants me to drive it for him, it has original interior


 
chevytruckdude 
Senior Member
Posts: 4285

Loc: Minneapolis, MN
Reg: 09-28-03
Re: CHEVY BOLT PATTERN
12-31-03 11:37 AM - Post#364257    
    In response to DonSSDD

1/2 ton 2wd chev and gmc truck and vans also share the same bolt pattern as fullsize gm cars.
1964 Impala SS 383 4spd
1966 Pontiac Lemans 350 700R4
1984 C10 Cheyenne ShrtBx 2wd 350 700R4
1995 Chevy Caprice 9C1/LT1
2001 GMC Sierra SLE Z71 XtendCab ShrtBx 4wd 5.3 4L60E


 
kcthedog99 
Senior Member
Posts: 219
kcthedog99
Reg: 09-28-03
Re: CHEVY BOLT PATTERN
12-31-03 12:10 PM - Post#364258    
    In response to RICK`S SS

If I remember my geometry correctly and working it out as a geomentry problem, the bolt circle diameter should be 1.7 times the center-to-center distance of any two adjacent studs. The factor of 1.7 ONLY applies to a 5 stud wheel.

 
Anonymous 

Re: CHEVY BOLT PATTERN
12-31-03 01:02 PM - Post#364259    
    In response to RICK`S SS

Hey I hate to rain on a parade - but Kaiser is correct.

That is the way many custom wheel mfgs measure bolt circle diameter.


Rich, 1971 was the introduction of the 5" bolt circle on the large car Chevy line (same as the 1/2 ton truck chassis)

So any 5 bolt Chevy wheel prior to 1971 (Chevelle/Monte were still 4.750") will be 4.750" bolt circle.

As mentioned by the other member, the backspacing is critical for clearance with the inner fender/suspension components. Also, if front disc brakes are used, make sure the rim doesn't interfere with the caliper - some can.


 
RICK`S SS 
Member
Posts: 54

Loc: United States
Reg: 11-16-03
Re: CHEVY BOLT PATTERN
12-31-03 03:50 PM - Post#364260    
    In response to wskaiser

thanks to all that replied,i think i got it now
Ricks`s SS
68 corvette T-Top 4 speed
64 malibu 283 4 speed


 
doubleE 
Valued Contributor
Posts: 3778
doubleE
Loc: Eagan MN
Reg: 06-02-03
Re: CHEVY BOLT PATTERN
01-01-04 08:27 AM - Post#364261    
    In response to

OK - took the tape measure out to the garage to see who's right. First, do we all agree that the bolt circle for pre 71' full size passenger cars is 4.75" (4 3/4")as stated by Chevrolet? Here is what I came up with.

Useing Kaisers method of outside to outside edge of the studs and skipping one, I measured 5". Same method but using the center to center of same studs - 4.5".

Useing the 1.7 method, I measured 2 13/16" center to center of adjacent studs. After doing the math this came to 4.76" (which is close enough for me).

Useing the method I described in my 1st post, I measured 4.75".

So Ollie, If I want to purchase a new set of wheels from an after market source for my 62' Impala, do I ask for 4.5", 4.75", or 5"
Proud owner of My Blue 62 Impala SS


 
62sedan 
Very Senior Member
Posts: 3691
62sedan
Age: 63
Loc: Above the dirt
Reg: 08-12-02
Re: CHEVY BOLT PATTERN
01-01-04 08:43 AM - Post#364262    
    In response to doubleE

Quote:

Useing Kaisers method of outside to outside edge of the studs and skipping one, I measured 5". Same method but using the center to center of same studs - 4.5".




doubleE: Re-read his posting, as you did not measure as how he stated to do so. (see the following)

Quote:

Don't measure from center to center. Hook the tape over the outside edge of one stud and then skip one stud and measure to the center of the next stud.


Chuck






 
doubleE 
Valued Contributor
Posts: 3778
doubleE
Loc: Eagan MN
Reg: 06-02-03
Re: CHEVY BOLT PATTERN
01-01-04 10:09 AM - Post#364263    
    In response to 62sedan

Sorry, my mistake. Going from the outside of one to the center of the other does come to 4.75" but still seems a little hoky to me. It appears to work in this case but what if you had larger or smaller studs? That would alter this measurement.

Measuring the true diameter of the circle going through the center of the studs / holes works no matter if if its a 4, 5, 6, or 8 hole bolt pattern. DoubleE
Proud owner of My Blue 62 Impala SS


 
threeimpalas 
Senior Member
Posts: 918

Loc: M'town, IA
Reg: 02-21-02
Re: CHEVY BOLT PATTERN
01-01-04 11:25 AM - Post#364264    
    In response to chevytruckdude

Quote:

1/2 ton 2wd chev and gmc truck and vans also share the same bolt pattern as fullsize gm cars.




Depends on the model years you are talking about.

The 1991-96 fullsize car bolt pattern is 5 x 5", same pattern shared with the half-ton pickups till the current body style trucks. The '71-'76 B-Bodies did have the 5 x 5", but that was do to their ~4,200 lbs curb weight.

The down-sized B-Bodies of '77-'90 had the 5 x 4.75" bolt pattern, shared with other GM rear wheel drive cars. The '77-'90 wagons, police, and taxi cars had the 5 x 5" pattern as part of their HD brake package.

The '77-'90 Cadillacs, Buicks, and Oldsmobiles, that retained the long 121.5" wheel base also retained the 5 x 5" pattern, also having the HD brakes because of their ~4,200lbs.

When the '91-96 B-Body arrived, GM made the 5 x 5" pattern standard, on sedans and wagons, again because of weight, this time ~4,000 lbs.

So, in summary, you'll need to double check the bolt patterns when it comes to the "full size" GM cars.
Mike


 
kcthedog99 
Senior Member
Posts: 219
kcthedog99
Reg: 09-28-03
Re: CHEVY BOLT PATTERN
01-01-04 01:50 PM - Post#364265    
    In response to doubleE

For what it's worth:

Mathmatically speaking, the actual bolt circle diameter can be found using the following factors....

4 bolt pattern - 1.4 times the center-to-center distance between adjacent lug bolts

5 bolt pattern - 1.7 times the center-to-center distance between adjacent lug bolts

6 bolt pattern - 2 times the center-to-center distance between adjacent lug bolts

8 bolt pattern - 2.6 times the center-to-center distance between adjacent lug bolts

The value you get will be approximate since the 1.4, 1.7, 2 and 2.6 factors are rounded-off values of a more precise number. Still, the number you calculate should be very close ... as confirmed above.

Now, that being said, the calculations will measure the actual bolt circle diameter. If the industry measures in a way that specifies the bolt cirlce diameter is something other than the actual all bets are off.

 
stinger74 
Senior Member
Posts: 1649

Age: 40
Loc: Park Hills, MO, USA
Reg: 09-08-02
Re: CHEVY BOLT PATTERN
01-01-04 01:58 PM - Post#364266    
    In response to kcthedog99

My......head......hurts.
how much is that chevy in the window? wuff wuff


 
Bigpat1802 
Senior Member
Posts: 603

Loc: Lincoln,Nebraska
Reg: 02-02-03
Re: CHEVY BOLT PATTERN
01-01-04 03:20 PM - Post#364267    
    In response to RICK`S SS

Kaiser's way is the correct way..if you have 5 bolts...Otherwise if you have more or less you do not use the same method....If you have a Jeg's Catalog..look inside they give you pics and instrunctions on how to check all!

Your 64 Impala has a 5x4 3/4
However my rear on my 64 has a 5x4 1/2...lol (Ford 9" baby)
64 Impala


 
raycow 
Honored Member
Posts: 18406

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
Re: CHEVY BOLT PATTERN
01-01-04 05:40 PM - Post#364268    
    In response to Bigpat1802

Quote:

Kaiser's way is the correct way..if you have 5 bolts




Kaiser's method is needed ONLY if you have 5 bolts. If you have any even number you can just measure the bolt circle directly (center to center of any two studs/holes straight across from each other).

Ray
Bacon is the gateway drug for vegetarians - Bridget Lancaster


 
poncho62 
Member
Posts: 21

Loc: Ontario, Canada
Reg: 11-01-03
Re: CHEVY BOLT PATTERN
01-02-04 04:26 AM - Post#364269    
    In response to raycow

GAWD.....it's not rocket science.

5 stud wheel....measure centre to centre across the studs and add 1/4 in.


 
Anonymous 

Re: CHEVY BOLT PATTERN
01-02-04 07:40 AM - Post#364270    
    In response to poncho62

From the wheel interchange

To determine bolt circle diameter measure from center of 1 stud hole to center of furthest stud hole skipping 1 stud. Measurement will not be exact and must be converted as follows;


measurement = Bolt circle
3-3/4" = 4"
4-1/4" = 4-1/2"
4-1/2" = 4-3/4"
4-11/16" = 5"
5-3/16" = 5-1/2"
94.3mm (3-11/16") = 100mm

Source - Hollander Wheel Interchange 56th edition


 
Moopar2ya2 
Senior Member
Posts: 429

Loc: Calgary, Canada
Reg: 03-15-03
Re: CHEVY BOLT PATTERN
01-02-04 11:03 AM - Post#364271    
    In response to

Most wheel places and wreckers have a set of devices that look like plastic measuring spoons with a cone shaped end so they can accurately determine the bolt pattern spacing by measuring the distance and reading off the bolt pattern from the gage. Saves heads from hurting. There are also some after market wheels (mag and steel) that have both patterns. To further confuse things the U.S. Pontiacs have the 5 on 5 while the Canadian ones have what ever the Chev of that size and vintage did.

 
poncho62 
Member
Posts: 21

Loc: Ontario, Canada
Reg: 11-01-03
Re: CHEVY BOLT PATTERN
01-02-04 04:09 PM - Post#364272    
    In response to

Quote:

From the wheel interchange

To determine bolt circle diameter measure from center of 1 stud hole to center of furthest stud hole skipping 1 stud. Measurement will not be exact and must be converted as follows;


measurement = Bolt circle
3-3/4" = 4"
4-1/4" = 4-1/2"
4-1/2" = 4-3/4"
4-11/16" = 5"
5-3/16" = 5-1/2"
94.3mm (3-11/16") = 100mm

Source - Hollander Wheel Interchange 56th edition





Seems to me, they are adding 1/4 inch................

 
Anonymous 

Re: CHEVY BOLT PATTERN
01-02-04 06:26 PM - Post#364273    
    In response to poncho62

I know the bolt pattern to my belair i just want to know what back spacing did the factory stock 1963 belair have? What back spacing would i have to use to put a 15x10 on the back of a belair?

 
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