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Old 07-26-2015, 12:12 AM   #1
BigRed76
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Anyone know back spacing of 15x7 truck rally's?

So today I installed ECE 2.5" drop spindles on my '71, after it was all together I went to put the wheels on the they are rubbing on the spindle where the tie rod attaches to the spindle. The wheels are 15x8 truck rally's with 4" back spacing and I had no issues when the truck had stock spindles and drop springs. I tried researching the back spacing of 7" truck rally's but everything I found was about the corvette rally's. I'm hoping that I can get away with some 15x7 rally's. So if anyone can confirm the back spacing options available for 15x7 truck rally's I would appreciate it.
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1970 Chevrolet Custom Camper K20
1971 GMC Super K2500, 12V/NV4500 swap in progress
1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB

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Old 07-26-2015, 12:29 AM   #2
cericd
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Re: Anyone know back spacing of 15x7 truck rally's?

3 5/8"
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Old 07-26-2015, 12:37 AM   #3
geezer#99
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Re: Anyone know back spacing of 15x7 truck rally's?

Save on wheel shopping and swapping, get some 1/4 inch spacers.
http://www.summitracing.com/int/part...4082/overview/
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Old 07-26-2015, 01:04 AM   #4
BigRed76
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Re: Anyone know back spacing of 15x7 truck rally's?

Quote:
Originally Posted by geezer#99 View Post
Save on wheel shopping and swapping, get some 1/4 inch spacers.
http://www.summitracing.com/int/part...4082/overview/
I thought about that too but I'm not sure that would leave enough threads on the wheel studs to safely bolt on the wheels.
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1970 Chevrolet Custom Camper K20
1971 GMC Super K2500, 12V/NV4500 swap in progress
1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB

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Old 07-26-2015, 01:05 AM   #5
BigRed76
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Re: Anyone know back spacing of 15x7 truck rally's?

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Originally Posted by cericd View Post
3 5/8"
That is good to hear because a 3 5/8" back space will clear for sure. Thanks
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Zach

1970 Chevrolet Custom Camper K20
1971 GMC Super K2500, 12V/NV4500 swap in progress
1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB

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Old 07-26-2015, 01:12 AM   #6
luvbowties
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Smile Re: Anyone know back spacing of 15x7 truck rally's?

Quote:
Originally Posted by BigRed76 View Post
I thought about that too but I'm not sure that would leave enough threads on the wheel studs to safely bolt on the wheels.
Use longer studs?
Sam
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Old 07-26-2015, 08:40 AM   #7
geezer#99
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Re: Anyone know back spacing of 15x7 truck rally's?

Quote:
Originally Posted by BigRed76 View Post
I thought about that too but I'm not sure that would leave enough threads on the wheel studs to safely bolt on the wheels.
You need the nut to thread on the same amount as the size of your stud's diameter.
A 1/2 inch stud needs 1/2 inch of thread used to be safe.
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