71 C10 2wd Center Bore - The 1947 - Present Chevrolet & GMC Truck Message Board Network

P7M89MM · 10-17-2020, 11:25 PM

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!

**kwmech** · 10-18-2020, 01:35 AM

Huh? Whaaaat?

P7M89MM · 10-18-2020, 01:42 AM

Quote:

Originally Posted by kwmech

Huh? Whaaaat?

Wheel center bore for hub centric spacers/wheels.

geezer#99 · 10-18-2020, 08:15 AM

An 1/8 inch spacer doesn’t need to be hub centric.
Can be a little loose.
You guys need to learn metric.

**Ol Blue K20** · 10-18-2020, 09:36 AM

Quote:

Originally Posted by geezer#99

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.

P7M89MM · 10-18-2020, 06:53 PM

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.

**Ol Blue K20** · 10-18-2020, 07:14 PM

I didn't think these were hubcentric. I learn something new every day.

**bigmac73** · 10-18-2020, 07:16 PM

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.

P7M89MM · 10-18-2020, 07:21 PM

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 ��

**bigmac73** · 10-18-2020, 07:52 PM

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

10-17-2020, 11:25 PM	#1
P7M89MM Registered User Join Date: Apr 2017 Location: Spokane, WA Posts: 101	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! __________________ 71 Cheyenne LWB - RideTech Air, zz502, 20" Torq Thrusts 16 Sierra - Bilstein 6112/5160, 33" Duratracs, Method Race Wheels, GMPP Intake, Borla Exhaust 15 4Runner - Icon Coilovers, 33" Duratracs, Pro Comp Wheels, NFABs 16 Malibu Response TXi

10-18-2020, 01:35 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,389	Re: 71 C10 2wd Center Bore Huh? Whaaaat?

10-18-2020, 08:15 AM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	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.

10-18-2020, 06:53 PM	#6
P7M89MM Registered User Join Date: Apr 2017 Location: Spokane, WA Posts: 101	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. __________________ 71 Cheyenne LWB - RideTech Air, zz502, 20" Torq Thrusts 16 Sierra - Bilstein 6112/5160, 33" Duratracs, Method Race Wheels, GMPP Intake, Borla Exhaust 15 4Runner - Icon Coilovers, 33" Duratracs, Pro Comp Wheels, NFABs 16 Malibu Response TXi

10-18-2020, 07:14 PM	#7
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 15,834	Re: 71 C10 2wd Center Bore I didn't think these were hubcentric. I learn something new every day. __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

10-18-2020, 07:16 PM	#8
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	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. __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

10-18-2020, 07:21 PM	#9
P7M89MM Registered User Join Date: Apr 2017 Location: Spokane, WA Posts: 101	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 �� __________________ 71 Cheyenne LWB - RideTech Air, zz502, 20" Torq Thrusts 16 Sierra - Bilstein 6112/5160, 33" Duratracs, Method Race Wheels, GMPP Intake, Borla Exhaust 15 4Runner - Icon Coilovers, 33" Duratracs, Pro Comp Wheels, NFABs 16 Malibu Response TXi

10-18-2020, 07:52 PM	#10
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	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 __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks



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