Whats the widest tire i can fit with a 6in drop? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chugger · 01-03-2005, 12:07 AM

I have a 71 swb with a 6in drop in the rear prob 7in to come soon. I have 15x10 weld draglite xp's with a 5.5 backspace. So what is the widest tire i can fit between the fenderwells without cutting anything. i have seen a 295/50-15. I wonder if a 29/11.50-15 will fit or maybe even a 315/60-15. please help pics would be great as well thanks.
chris

doc_rock · 01-03-2005, 12:58 AM

295=MM's. measure it out and see. I can't tell you exactly what it is, but I can tell you that you'll need the following:
10" converted to MM's, bolt the rim on and see where it lines up. Measure from the inboard edge of the rim to the outside edge of the frame (or the underside of the bed, depending on which is closer to the rim). I'll try to explain the calculation from there, but it's late, and I'm stupid to start with.

10"=254mm(roughly) let's say for the sake of argument, you have two inches between the edge of the rim, and the nearest point on the frame. Be conservative, and multiply it by 1.5, so that's 3". So, according to this forumla, you should be able to run a 407mm wide tire, or about 16". 11.50 or "50" in series is the profile of the tire. I'm off, I think, but I THINK 50 means it's half as tall as it is wide.(from the rim to the tread). 11.50 is 11.5" tall from the rim to the tread.

I'm probably wrong, but give it a shot and see.

70c10 · 01-03-2005, 08:30 AM

This is an example for a 295/50/15. Take the the 295 milimeters and divide by 25(because there are 25 milimeters per inch) =11.8 inches. Multiply 11.8 x 50 which is percent (.50)=5.9 inches. This is the height from the edge of the rim to the outer edge of the tire. Since you have this much sidewall on BOTH sides of the rim you multiply this by 2 = 11.8 now add the 15" rim diameter and get 26.8" tire height. If you had a 60 series tire of course you would multiply by .60 and so on. I know this doesn't exactly answer your original question but I have seen 29-12.50x15 on the rear with no probs whatsover.

Chugger · 01-03-2005, 08:43 AM

i know that they will fit a stock height truck but being as low as i am id rather know before i buy. Im am unsure on what tire to get and size any suggestions. Thanks for the help.
chris

GreyHoundSteve · 01-03-2005, 10:26 AM

I dont know if this will help you or not but i test fitted my 22X9.5 in the back that have 5.62" bs and i only have about an inch or so to the inside. I pulled a 295/50/15 off the truck but im not sure about the backspacing of the rim it was on. With 5.62 and a 9.5 rim im cutting it close to the inside. Im on the hunt for tubbed wheel wells today.

Chugger · 01-03-2005, 04:40 PM

To the top
thanks

doc_rock · 01-03-2005, 07:23 PM

go to the local tire shop and get a set of used tires. Should only need one, and should be able to grab one for a few bucks, if not completely free. Doesnt' ahve to have any tread on it to check.

Chugger · 01-03-2005, 10:52 PM

To the top again

Chugger · 01-04-2005, 03:27 PM

Anyone have anymore suggestions.
thanks
chris

camaro__thunder · 01-04-2005, 04:46 PM

DROP: 5" of spring, 3" of block

TIRES: 295/50/15

RIM: 15x10 w/ 5" of backspacing

I have about an 1" maybe a little more clearance on each side

Oborny71 · 01-12-2005, 10:45 PM

my 67 - 4" front drop, 6" rear. 325/50/15 on 10 rim out back , there is about 1" on inner side.

2low72 · 01-12-2005, 11:12 PM

I have 275/60/15, but never really looked on the inside to see how much room there was. I think I'll do that tomorrow.

Chugger · 01-13-2005, 09:14 AM

thanks everyone
Oborny what is your rear backspacing. a 325-50 looks like major meat.
i mike go with a 295/50 radial ta or a 315/60 drag radial or a 325/50. oh my all the choices
thanks again
chris

Oborny71 · 01-13-2005, 02:42 PM

baskspacing I think is 4 1/2" , can't remember for sure. this truck does have a 71
rearend under it, which is 2" wider than a 67. so it helps a little as far as clearance to the inside, but i think it would still work with a 67-69 rearend.

FirstGen · 01-13-2005, 02:58 PM

I'm running 325/50/15's on a 4/6 drop no problems...

Slammed67 · 01-13-2005, 03:47 PM

Quote:

(because there are 25 milimeters per inch)

25.4 to be presise.

01-03-2005, 12:07 AM	#1
Chugger Registered User Join Date: Nov 2004 Posts: 18	Whats the widest tire i can fit with a 6in drop? I have a 71 swb with a 6in drop in the rear prob 7in to come soon. I have 15x10 weld draglite xp's with a 5.5 backspace. So what is the widest tire i can fit between the fenderwells without cutting anything. i have seen a 295/50-15. I wonder if a 29/11.50-15 will fit or maybe even a 315/60-15. please help pics would be great as well thanks. chris

01-03-2005, 08:30 AM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	This is an example for a 295/50/15. Take the the 295 milimeters and divide by 25(because there are 25 milimeters per inch) =11.8 inches. Multiply 11.8 x 50 which is percent (.50)=5.9 inches. This is the height from the edge of the rim to the outer edge of the tire. Since you have this much sidewall on BOTH sides of the rim you multiply this by 2 = 11.8 now add the 15" rim diameter and get 26.8" tire height. If you had a 60 series tire of course you would multiply by .60 and so on. I know this doesn't exactly answer your original question but I have seen 29-12.50x15 on the rear with no probs whatsover. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

01-04-2005, 04:46 PM	#10
camaro__thunder Epoxy Primer Friendly Join Date: Feb 2004 Location: South of Houston TEXXXAS Posts: 680	DROP: 5" of spring, 3" of block TIRES: 295/50/15 RIM: 15x10 w/ 5" of backspacing I have about an 1" maybe a little more clearance on each side __________________ My Project 69 SWB SHAVED BAGGED DOORED

01-12-2005, 10:45 PM	#11
Oborny71 Registered User Join Date: Apr 2001 Location: Lincoln, Nebraska Posts: 587	my 67 - 4" front drop, 6" rear. 325/50/15 on 10 rim out back , there is about 1" on inner side. Attached Images __________________ 67 Chevy SWB - goal of a 1,000 hp weekend cruiser

01-12-2005, 11:12 PM	#12
2low72 Registered User Join Date: Mar 2004 Location: Cheyenne, Wy Posts: 555	I have 275/60/15, but never really looked on the inside to see how much room there was. I think I'll do that tomorrow. __________________ 2014 GMC Yukon XL (Wifey's) 2004 Chevy Silverado Crew Cab Z71

01-03-2005, 12:58 AM	#2
doc_rock Registered User Join Date: Dec 2004 Location: Jacksonville, FL Posts: 84	295=MM's. measure it out and see. I can't tell you exactly what it is, but I can tell you that you'll need the following: 10" converted to MM's, bolt the rim on and see where it lines up. Measure from the inboard edge of the rim to the outside edge of the frame (or the underside of the bed, depending on which is closer to the rim). I'll try to explain the calculation from there, but it's late, and I'm stupid to start with. 10"=254mm(roughly) let's say for the sake of argument, you have two inches between the edge of the rim, and the nearest point on the frame. Be conservative, and multiply it by 1.5, so that's 3". So, according to this forumla, you should be able to run a 407mm wide tire, or about 16". 11.50 or "50" in series is the profile of the tire. I'm off, I think, but I THINK 50 means it's half as tall as it is wide.(from the rim to the tread). 11.50 is 11.5" tall from the rim to the tread. I'm probably wrong, but give it a shot and see.

01-03-2005, 08:43 AM	#4
Chugger Registered User Join Date: Nov 2004 Posts: 18	i know that they will fit a stock height truck but being as low as i am id rather know before i buy. Im am unsure on what tire to get and size any suggestions. Thanks for the help. chris

01-03-2005, 10:26 AM	#5
GreyHoundSteve Registered User Join Date: Oct 2004 Location: DFW TX Posts: 769	I dont know if this will help you or not but i test fitted my 22X9.5 in the back that have 5.62" bs and i only have about an inch or so to the inside. I pulled a 295/50/15 off the truck but im not sure about the backspacing of the rim it was on. With 5.62 and a 9.5 rim im cutting it close to the inside. Im on the hunt for tubbed wheel wells today.

01-03-2005, 04:40 PM	#6
Chugger Registered User Join Date: Nov 2004 Posts: 18	To the top thanks

01-03-2005, 07:23 PM	#7
doc_rock Registered User Join Date: Dec 2004 Location: Jacksonville, FL Posts: 84	go to the local tire shop and get a set of used tires. Should only need one, and should be able to grab one for a few bucks, if not completely free. Doesnt' ahve to have any tread on it to check.

01-03-2005, 10:52 PM	#8
Chugger Registered User Join Date: Nov 2004 Posts: 18	To the top again

01-04-2005, 03:27 PM	#9
Chugger Registered User Join Date: Nov 2004 Posts: 18	Anyone have anymore suggestions. thanks chris

01-13-2005, 09:14 AM	#13
Chugger Registered User Join Date: Nov 2004 Posts: 18	thanks everyone Oborny what is your rear backspacing. a 325-50 looks like major meat. i mike go with a 295/50 radial ta or a 315/60 drag radial or a 325/50. oh my all the choices thanks again chris

01-13-2005, 02:42 PM	#14
Oborny71 Registered User Join Date: Apr 2001 Location: Lincoln, Nebraska Posts: 587	baskspacing I think is 4 1/2" , can't remember for sure. this truck does have a 71 rearend under it, which is 2" wider than a 67. so it helps a little as far as clearance to the inside, but i think it would still work with a 67-69 rearend. __________________ 67 Chevy SWB - goal of a 1,000 hp weekend cruiser

01-13-2005, 02:58 PM	#15
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	I'm running 325/50/15's on a 4/6 drop no problems... __________________ 1968 C10 build in process TT LSA/6L90e/9"



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