8 Lug K20 Rim/Tire Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

thump426er · 11-26-2010, 11:27 AM

I've doen some searching on here to try and find a thread specifically on this and haven't been too successful.

I have a 72 K20 with the original 16 wheels with tires which measure out at 30.5" diameter. What I'd like to do is find some nice 8 spoke (or some style I like) rims to throw on it with a little bigger diameter tire. Hoping to get 32-33" in there. Looking at 17-18" rim diameter as well.

A few questions I have:
- what are my options in terms of searching for rims, eg: when I talk to tire rack or discount tire etc their computer doesn't show rims for those so they can't help out at all but I would guess that say an 85 3/4 8 lug would fit mine as well, I see on here that older ford 8 lugs fit??? What are some examples of other model year vehicles with rims that will and won't fit.

- How much back spacing would I need?

- What size tire can I get away with without rubbing on a stock ride height 72 K20.

Thanks for any input to this.

Jacfourteen · 11-26-2010, 04:12 PM

I would think that the newer chevy would fit right, so I'd give them the oldest k20 in their system. I think that you could fit a 33" tire in there just fine because my c20 is dropped 3" in front and 4" in the rear and I have 31" x 10.5" with no rubbing. Ford rims will fit but the hub hole is bigger so all the weight rides on the lugs not the hub. I have a set of old ford wheels on mine because they were cheap and they work fine. If buying used I wouldn't hesitate on the Ford, but if buying new there is no reason to not get ones that fit right. Hope this helps you out.

Jacfourteen · 11-26-2010, 04:14 PM

Oh, didn't see that you are a new guy so,

from Norcal!

69fleetside · 11-26-2010, 05:11 PM

i have a '69 gmc 3/4 and just put 20X10's on all four corners. i have it lowered 3" in front and 4" in the rear. every thing fits no rubbing. i'm running 275/45/20 which puts my tire height right at 29.5". the back space is 5" on all four. i think just about any 8 X 6.5 would fit. hope this helps.

CG · 11-26-2010, 05:18 PM

I have a K20 with 33 12.5 16.5 with no lift and they fit fine.

thump426er · 11-29-2010, 11:24 AM

Thanks for the input guys, this helps.

11-26-2010, 11:27 AM	#1
thump426er Registered User Join Date: Oct 2010 Location: MT Posts: 46	8 Lug K20 Rim/Tire Question I've doen some searching on here to try and find a thread specifically on this and haven't been too successful. I have a 72 K20 with the original 16 wheels with tires which measure out at 30.5" diameter. What I'd like to do is find some nice 8 spoke (or some style I like) rims to throw on it with a little bigger diameter tire. Hoping to get 32-33" in there. Looking at 17-18" rim diameter as well. A few questions I have: - what are my options in terms of searching for rims, eg: when I talk to tire rack or discount tire etc their computer doesn't show rims for those so they can't help out at all but I would guess that say an 85 3/4 8 lug would fit mine as well, I see on here that older ford 8 lugs fit??? What are some examples of other model year vehicles with rims that will and won't fit. - How much back spacing would I need? - What size tire can I get away with without rubbing on a stock ride height 72 K20. Thanks for any input to this.

11-26-2010, 04:12 PM	#2
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: 8 Lug K20 Rim/Tire Question I would think that the newer chevy would fit right, so I'd give them the oldest k20 in their system. I think that you could fit a 33" tire in there just fine because my c20 is dropped 3" in front and 4" in the rear and I have 31" x 10.5" with no rubbing. Ford rims will fit but the hub hole is bigger so all the weight rides on the lugs not the hub. I have a set of old ford wheels on mine because they were cheap and they work fine. If buying used I wouldn't hesitate on the Ford, but if buying new there is no reason to not get ones that fit right. Hope this helps you out. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

11-26-2010, 04:14 PM	#3
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: 8 Lug K20 Rim/Tire Question Oh, didn't see that you are a new guy so, from Norcal! __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

11-26-2010, 05:11 PM	#4
69fleetside Registered User Join Date: Aug 2010 Location: roseville, CA. Posts: 10	Re: 8 Lug K20 Rim/Tire Question i have a '69 gmc 3/4 and just put 20X10's on all four corners. i have it lowered 3" in front and 4" in the rear. every thing fits no rubbing. i'm running 275/45/20 which puts my tire height right at 29.5". the back space is 5" on all four. i think just about any 8 X 6.5 would fit. hope this helps.

11-26-2010, 05:18 PM	#5
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 20,035	Re: 8 Lug K20 Rim/Tire Question I have a K20 with 33 12.5 16.5 with no lift and they fit fine. __________________ … … … … … … … … ... … … … … … … … … … … …

11-29-2010, 11:24 AM	#6
thump426er Registered User Join Date: Oct 2010 Location: MT Posts: 46	Re: 8 Lug K20 Rim/Tire Question Thanks for the input guys, this helps.



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