Biggest rear tires on 85 SWB C10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TopNotchSWB · 11-15-2010, 04:41 PM

What would be the biggest tires I could fit if I lower the truck 5/7? Being that I want skinnies in the front and some nice sized meats out back using a 15x10 rim and without having to tub the truck. Also what kind of back spacing would this take from the rim?

This will be my crusier / bracket truck and not my balls out race vehicle. Probably gonna stick some MT ET Street drag radials out back unless anyone else has some suggestions.

Right now the truck has a cammed out 355 centerbolt SBC with 750 double pumper, heddman long tubes, 2.5 x pipe and 2.5 true dual bullet mufflers dumped after the cab. Its just enough to get it the body shop to have it painted, the interior replaced then back to me so I can have the fuel system, gauge panel with all the switches for the electric water pump, electric fans, etc, etc, etc all hooked up.

swb85 · 11-15-2010, 05:48 PM

325/50/15 mickey drag radial should fit in the factory tubs, not sure how being that low will hurt clearance.....they also make a 315/60 radial that's like 30" tall and a lil bit narrower. I run the 325's for street tires on my camaro (slicks for the track), so if you need some measurements I can get em for ya.

TopNotchSWB · 11-15-2010, 08:38 PM

Thanks bro I really appreciate it. I think I am going to go with something along the line of a 28 inch tall tire. I just wish I knew what kind of back spacing to work with.

KQQL IT · 11-16-2010, 12:11 AM

4.5/4.75ish on a 10'' wheel
i bought 3.75bs wheels with 295/50's and they rubbed.

325/50 on a 10''

BossHogg69 · 11-16-2010, 01:03 AM

I ran a set of 18x9.5's with 5.5" bs and 295/35/18 tires on an '84 I once had. It was dropped 4/6 and had no rubbing or clearance issues at all. Honestly, I think with a 10" wide rim, you could run 5" of bs, and tuck just fine. You should do a little measuring just to make sure, but those squarebody trucks have a lot of room back there.

11-15-2010, 04:41 PM	#1
TopNotchSWB Registered User Join Date: Nov 2010 Location: Brownsville, Texas Posts: 26	Biggest rear tires on 85 SWB C10 What would be the biggest tires I could fit if I lower the truck 5/7? Being that I want skinnies in the front and some nice sized meats out back using a 15x10 rim and without having to tub the truck. Also what kind of back spacing would this take from the rim? This will be my crusier / bracket truck and not my balls out race vehicle. Probably gonna stick some MT ET Street drag radials out back unless anyone else has some suggestions. Right now the truck has a cammed out 355 centerbolt SBC with 750 double pumper, heddman long tubes, 2.5 x pipe and 2.5 true dual bullet mufflers dumped after the cab. Its just enough to get it the body shop to have it painted, the interior replaced then back to me so I can have the fuel system, gauge panel with all the switches for the electric water pump, electric fans, etc, etc, etc all hooked up.

11-15-2010, 05:48 PM	#2
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Biggest rear tires on 85 SWB C10 325/50/15 mickey drag radial should fit in the factory tubs, not sure how being that low will hurt clearance.....they also make a 315/60 radial that's like 30" tall and a lil bit narrower. I run the 325's for street tires on my camaro (slicks for the track), so if you need some measurements I can get em for ya. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

11-15-2010, 08:38 PM	#3
TopNotchSWB Registered User Join Date: Nov 2010 Location: Brownsville, Texas Posts: 26	Re: Biggest rear tires on 85 SWB C10 Thanks bro I really appreciate it. I think I am going to go with something along the line of a 28 inch tall tire. I just wish I knew what kind of back spacing to work with.

11-16-2010, 12:11 AM	#4
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,257	Re: Biggest rear tires on 85 SWB C10 4.5/4.75ish on a 10'' wheel i bought 3.75bs wheels with 295/50's and they rubbed. 325/50 on a 10'' __________________ " That didnt make it any newer " " Dont antique the equipment " Last edited by KQQL IT; 11-16-2010 at 12:18 AM.

11-16-2010, 01:03 AM	#5
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: Biggest rear tires on 85 SWB C10 I ran a set of 18x9.5's with 5.5" bs and 295/35/18 tires on an '84 I once had. It was dropped 4/6 and had no rubbing or clearance issues at all. Honestly, I think with a 10" wide rim, you could run 5" of bs, and tuck just fine. You should do a little measuring just to make sure, but those squarebody trucks have a lot of room back there. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

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