Use it or loose it? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

greenhorn male · 08-23-2003, 03:54 AM

I have these 15x10 wheels which have a serious negative offset (not sure if this is the correct terminology). The back of it says offset -50? I included pictures with measurements. The front measures is 6-3/4" and the rear is 3-1/2".
I have 33x12.50's and 15x8 ralley's on my 71 K10 with a 4" lift.
I like the looks of the ralley's but I'm not sure if 8" is wide enough for my tires.
1- Are the 15x8's wide enough for the 33x12.50 tires?
2- Would you use wheels with this offset? Why not?
3- Can you post pics of something similar that shows how much they stick out?

Should I use theM or loose them?

Thanks! I'm posting this on the 67-72 message board as well

greenhorn male · 08-23-2003, 03:55 AM

pic 2 6-3/4"

greenhorn male · 08-23-2003, 03:56 AM

pic 3, back of wheel 3-1/2"

stlaser · 08-23-2003, 08:11 AM

8" wide is plenty for the tires you would like to run, some people may tell you different but I've done it and it looks and works fine. Offsets should be all right just use the 3.5" rims up front so you have plenty of turning clearance.

greenhorn male · 08-23-2003, 01:33 PM

I may have not described it clearly. All 4 wheels are the same. The first measurement is from the front and the second from the back of the wheel. Both measured with a straight edge resting on the wheel and measured from the flat area by the lug holes. Is the measurement from the back (3 1/2") the backspacing? Would these give more turning clearance? It would seem that the outside edge of the tires would rub more on turns when they stick out further.

stlaser · 08-23-2003, 03:51 PM

Might have to trim a fender. But I think you have plenty of clearance. It shouldn't be an issue.

wildwood · 08-23-2003, 04:07 PM

33s will fit fine on those rims. Most aftermarket rims have some off set. I'm sure it will look real nice. check out the "does anyone have sweat 4x4s" thread. You'll see alot of trucks with nice aftermarket rims with similar offset to that.

**Yukon Jack** · 08-24-2003, 02:05 PM

I'm using 16 x 8 rims for my 35 x 12.50's and the are fine. Wearing very even also.

72beast · 08-30-2003, 11:16 AM

the 3-1/2"inch backspacing is what you want (stock back space), they just look different cause the front has to stick out so much...I'm running the same rims but with 35's and the rears hit the front of the fenders (need to move the axle back 1") and the fronts will hit the back when stuffed up real good...but its more of a rubbing on both...

08-23-2003, 03:54 AM	#1
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	Use it or loose it? I have these 15x10 wheels which have a serious negative offset (not sure if this is the correct terminology). The back of it says offset -50? I included pictures with measurements. The front measures is 6-3/4" and the rear is 3-1/2". I have 33x12.50's and 15x8 ralley's on my 71 K10 with a 4" lift. I like the looks of the ralley's but I'm not sure if 8" is wide enough for my tires. 1- Are the 15x8's wide enough for the 33x12.50 tires? 2- Would you use wheels with this offset? Why not? 3- Can you post pics of something similar that shows how much they stick out? Should I use theM or loose them? Thanks! I'm posting this on the 67-72 message board as well __________________ 03 Tahoe 72 GMC Super Custom 2500 Custom Camper, my reliable workhorse. Dual gauged tanks, dual battery trays. Last edited by greenhorn male; 03-30-2006 at 02:32 AM.

08-23-2003, 03:55 AM	#2
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	pic 2 6-3/4" Last edited by greenhorn male; 03-30-2006 at 02:32 AM.

08-23-2003, 03:56 AM	#3
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	pic 3, back of wheel 3-1/2" Last edited by greenhorn male; 03-30-2006 at 02:32 AM.

08-23-2003, 08:11 AM	#4
stlaser Fabricator Join Date: Mar 2003 Location: Indiana Posts: 156	8" wide is plenty for the tires you would like to run, some people may tell you different but I've done it and it looks and works fine. Offsets should be all right just use the 3.5" rims up front so you have plenty of turning clearance. __________________ 84 C30 Chassis 60 & 14, 454/400/NP205 Retroing 98 X-tended Cab Built with the blood and sweat from the hands of a Chevy man.

08-23-2003, 03:51 PM	#6
stlaser Fabricator Join Date: Mar 2003 Location: Indiana Posts: 156	Might have to trim a fender. But I think you have plenty of clearance. It shouldn't be an issue. __________________ 84 C30 Chassis 60 & 14, 454/400/NP205 Retroing 98 X-tended Cab Built with the blood and sweat from the hands of a Chevy man.

08-23-2003, 01:33 PM	#5
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	I may have not described it clearly. All 4 wheels are the same. The first measurement is from the front and the second from the back of the wheel. Both measured with a straight edge resting on the wheel and measured from the flat area by the lug holes. Is the measurement from the back (3 1/2") the backspacing? Would these give more turning clearance? It would seem that the outside edge of the tires would rub more on turns when they stick out further.

08-23-2003, 04:07 PM	#7
wildwood Registered User Join Date: Jun 2003 Location: Calgary AB Posts: 110	33s will fit fine on those rims. Most aftermarket rims have some off set. I'm sure it will look real nice. check out the "does anyone have sweat 4x4s" thread. You'll see alot of trucks with nice aftermarket rims with similar offset to that. __________________ You can't get out if ya don't get in

08-24-2003, 02:05 PM	#8
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	I'm using 16 x 8 rims for my 35 x 12.50's and the are fine. Wearing very even also. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

08-30-2003, 11:16 AM	#9
72beast TONYP Join Date: Oct 2001 Location: So Cal Posts: 100	the 3-1/2"inch backspacing is what you want (stock back space), they just look different cause the front has to stick out so much...I'm running the same rims but with 35's and the rears hit the front of the fenders (need to move the axle back 1") and the fronts will hit the back when stuffed up real good...but its more of a rubbing on both... __________________ 72 K/5 350/205 SOFT-TOP DOUG THORLEY HEADERS A/C CUSTOM REAR BUMPER http://www.socalbigdawgs.com/tr/7.18.03/DSC04290.JPG

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