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Old 10-17-2020, 11:25 PM   #1
P7M89MM
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71 C10 2wd Center Bore

Can someone confirm the correct center bore for my truck? I thought it was 77.8mm. Tried a 1/8” spacer with 3.060 hole and it was too tight. Called Discount Tire and they’re telling me it’s 78.1mm. Maybe I should just solve my issue by tubbing the rear! Thanks!
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Old 10-18-2020, 01:35 AM   #2
kwmech
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Re: 71 C10 2wd Center Bore

Huh? Whaaaat?
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Old 10-18-2020, 01:42 AM   #3
P7M89MM
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Re: 71 C10 2wd Center Bore

Quote:
Originally Posted by kwmech View Post
Huh? Whaaaat?
Wheel center bore for hub centric spacers/wheels.
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Old 10-18-2020, 08:15 AM   #4
geezer#99
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Re: 71 C10 2wd Center Bore

An 1/8 inch spacer doesn’t need to be hub centric.
Can be a little loose.
You guys need to learn metric.
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Old 10-18-2020, 09:36 AM   #5
Ol Blue K20
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Re: 71 C10 2wd Center Bore

Quote:
Originally Posted by geezer#99 View Post
An 1/8 inch spacer doesn’t need to be hub centric.
Can be a little loose.
You guys need to learn metric.
What's metric? All my measuring devices are inches.
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Old 10-18-2020, 06:53 PM   #6
P7M89MM
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Re: 71 C10 2wd Center Bore

Went and got a new battery for my digital calipers. Apparently my hub is not very cylindrical. I got readings anywhere from 77.4 to 78.04. I suppose I should error on the large size and go with a 78.1, if I can even find one.
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Old 10-18-2020, 07:14 PM   #7
Ol Blue K20
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Re: 71 C10 2wd Center Bore

I didn't think these were hubcentric. I learn something new every day.
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Old 10-18-2020, 07:16 PM   #8
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Re: 71 C10 2wd Center Bore

I just put on new 20incher AR's and needed no spacer. the hub hole for the wheel was 3.083 or 78.30mm
i just cleaned up the hubs with a paper flapper wheel before i tried to measure them
measure the inside of your brake drum center hole if that fits then the bore needs to be close to that.
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Old 10-18-2020, 07:21 PM   #9
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Re: 71 C10 2wd Center Bore

Thanks. Wheels and tires fit great with the static drop. With the conversion to trailing arms and bags I get minor rubbing on the inside left rear wheel well when taking left hand corners. Figured I’d try this route before having the wells tubbed ��
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16 Sierra - Leveled, 33" Duratracs, Method Race Wheels, GMPP Intake, Borla Exhaust
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Old 10-18-2020, 07:52 PM   #10
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Re: 71 C10 2wd Center Bore

i have not gotten mine on the road yet. I went with a 275/55 -20 with stock height all the way around and hopefully i will not have any problems in the front
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