Rim Backspace Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DTerry · 03-21-2006, 08:15 PM

I have a 1970 GMC C-20 with rear leafs. It is droped 4-6 (spindles, cut coils and flip kit). I found some rims, but I dont know if they will fit. They are 18"x8.5". The website says the "back side"?? is 4.75, is this the backspacing? Will these fit? Thanks guys.

LUV2XCLR8 · 03-21-2006, 08:25 PM

4.75" is the backspacing, but I am no expert on fitment, there was a
wheel and tire fitment thread on here a while back, maybe it's in FAQ

redneckdds · 03-21-2006, 10:19 PM

here is one link...

http://www.1010tires.com/tech.asp

bs25j · 03-22-2006, 02:13 AM

A little off the topic but whered you get ur c 20 drop spindles??and btw i think theyll probly fit depending on the tire size you go with..

DTerry · 03-22-2006, 07:50 AM

I got mine at GMC Pauls, part number 1181582. I think thry were $229. They are 73-87 spindles but still keeps the 8 lugs which I wanted. I had to change to 73-87 upper and lower balljoints and outer tierod ends. I dont think you have to change the lower ball joints but I did anyways. I also changed to 73-87 disc brake setup. Ill take pictures later tonight.

03-21-2006, 08:15 PM	#1
DTerry '70 GMC C-25 LWB Join Date: Oct 2004 Location: Binghamton, N.Y. Posts: 273	Rim Backspace Question I have a 1970 GMC C-20 with rear leafs. It is droped 4-6 (spindles, cut coils and flip kit). I found some rims, but I dont know if they will fit. They are 18"x8.5". The website says the "back side"?? is 4.75, is this the backspacing? Will these fit? Thanks guys. __________________ 1970 GMC C-25 LWB (middle of frame up) 5-7 drop with 3in drop spindles, flip kit with blocks and still keeping the 3/4 ton. Shaved drip rails and marker lights, rear roll pan, cowl induction hood. 1987 Camaro z28 350, vortec 305 heads. 10:1 comp, t5 trans. Street terrrorizer. 1988 Monte Carlo (Super Stock ashpalt race car) My Truck

03-21-2006, 08:25 PM	#2
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,475	Re: Rim Backspace Question 4.75" is the backspacing, but I am no expert on fitment, there was a wheel and tire fitment thread on here a while back, maybe it's in FAQ __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Big Piggy: "Goliath" 07 Kodiak C4500 Lil Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

03-21-2006, 10:19 PM	#3
redneckdds Senior Member Join Date: Nov 2005 Location: Queen Creek, AZ Posts: 218	Re: Rim Backspace Question here is one link... http://www.1010tires.com/tech.asp __________________ '67/70 Chevy C/10 '10 2500 Crewcab Duramax 4wd

03-22-2006, 02:13 AM	#4
bs25j Registered User Join Date: Aug 2005 Location: Washington Posts: 80	Re: Rim Backspace Question A little off the topic but whered you get ur c 20 drop spindles??and btw i think theyll probly fit depending on the tire size you go with.. Last edited by bs25j; 03-22-2006 at 02:14 AM.

03-22-2006, 07:50 AM	#5
DTerry '70 GMC C-25 LWB Join Date: Oct 2004 Location: Binghamton, N.Y. Posts: 273	Re: Rim Backspace Question I got mine at GMC Pauls, part number 1181582. I think thry were $229. They are 73-87 spindles but still keeps the 8 lugs which I wanted. I had to change to 73-87 upper and lower balljoints and outer tierod ends. I dont think you have to change the lower ball joints but I did anyways. I also changed to 73-87 disc brake setup. Ill take pictures later tonight. __________________ 1970 GMC C-25 LWB (middle of frame up) 5-7 drop with 3in drop spindles, flip kit with blocks and still keeping the 3/4 ton. Shaved drip rails and marker lights, rear roll pan, cowl induction hood. 1987 Camaro z28 350, vortec 305 heads. 10:1 comp, t5 trans. Street terrrorizer. 1988 Monte Carlo (Super Stock ashpalt race car) My Truck Last edited by DTerry; 03-22-2006 at 07:54 AM.



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