wheel question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 10-01-2005, 11:26 PM

I have rallys 15x8 6 lug what is the bolt pattern 6-5.5 or 6-5 also anyone know the backspacing or how to figure it?

One more thing any good places to get deals on rims? for our trucks?

4x4Poet · 10-02-2005, 03:48 AM

Get a tape measure or ruler. Measure across the hub opening to determine whether it is 5.5" or 6.5".

Then place the rim on its back upon a flat surface. Measure from the flat surface to the back of the hub opening. That is the backspacing. You can also stretch a straight edge (ruler, 2x4, whatever) across the back side of the rim from rim lip to rim lip and measure from the rim lip plane to the back of the hub opening. That's the more accurate method to measure backspacing.

1STtimePRo'71 · 10-02-2005, 09:05 AM

http://128980.brightwebsite.com/lug_bolt_patterns/

jamesi20 · 10-03-2005, 08:59 PM

http://128980.brightwebsite.com/lug_bolt_patterns/

that's not the right info for my 70 c-10 2 wheel drive...it says 5 on 5 and 1/2" lug nuts but my truck which I am the second owner of has 6 lug with 7/16 lug nuts

Tx Firefighter · 10-03-2005, 09:33 PM

6 lug Chevy trucks are 6 on 5.5 inches. If your wheels are factory 4x4 rallys from 73-87, like most guys run, they have about 4.25 inches of backspace and a width of 8 inches.

Jamesi20, you are correct, a 70 model does indeed have 6 lug pattern with 7/16 studs. They went to the larger 1/2 inch studs when they went to 5 lug in 71.

10-01-2005, 11:26 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	wheel question I have rallys 15x8 6 lug what is the bolt pattern 6-5.5 or 6-5 also anyone know the backspacing or how to figure it? One more thing any good places to get deals on rims? for our trucks? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

10-02-2005, 03:48 AM	#2
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Get a tape measure or ruler. Measure across the hub opening to determine whether it is 5.5" or 6.5". Then place the rim on its back upon a flat surface. Measure from the flat surface to the back of the hub opening. That is the backspacing. You can also stretch a straight edge (ruler, 2x4, whatever) across the back side of the rim from rim lip to rim lip and measure from the rim lip plane to the back of the hub opening. That's the more accurate method to measure backspacing. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 10-02-2005 at 03:50 AM.

10-02-2005, 09:05 AM	#3
1STtimePRo'71 Registered User Join Date: Feb 2005 Location: Lake Crystal, MN Posts: 656	http://128980.brightwebsite.com/lug_bolt_patterns/ __________________ -Cory 1967 2 Wheel Chevy

10-03-2005, 09:33 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	6 lug Chevy trucks are 6 on 5.5 inches. If your wheels are factory 4x4 rallys from 73-87, like most guys run, they have about 4.25 inches of backspace and a width of 8 inches. Jamesi20, you are correct, a 70 model does indeed have 6 lug pattern with 7/16 studs. They went to the larger 1/2 inch studs when they went to 5 lug in 71. __________________ I'm on the Instagram- @Gearhead_Kevin

10-03-2005, 08:59 PM	#4
jamesi20 Senior Member Join Date: May 2002 Location: NORTHEAST OHIO Posts: 493	http://128980.brightwebsite.com/lug_bolt_patterns/ that's not the right info for my 70 c-10 2 wheel drive...it says 5 on 5 and 1/2" lug nuts but my truck which I am the second owner of has 6 lug with 7/16 lug nuts



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