20 inch wheel probloms - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigboi328 · 10-09-2014, 01:10 AM

I need help on my 65 c10 short fleet. I picked up a set of 20's for cheap and came with tires. The old tires are 275/60/15 with a o.d of 27.99 inches and the new set is 275/55/20 with a od of 31.91inches. My question is i am rubbing on the front of the rear fender and my lugs look like they may not fit. Any answers anything and i also was going to replace the springs any sizes.

**PGSigns** · 10-09-2014, 06:37 AM

That is a big tire. When I did my 65 i pulled the drums and put longer studs in and then bought new nuts with correct taper to match the wheels. You will have to trim the lip in the wheel well to fix the rub. You will find your speedometer is going to be several mph off to the slow side. On mine I could not get a tire near that big to work on the front.
Jimmy

vin63 · 10-09-2014, 08:22 AM

31-32" tall tire is really tall for our trucks, particularly when lowered - as that positions the rear axle line forward as a result of the arch of the trailing arms.

I run a 31" tall tire on the rear of my truck, but I modified the bed and wheel wells to run a 33" tall tire (to accommodate tire growth when I drag race it). I also run a CPP lowered trailing arm cross member that helps with the geometry. Here's an old photo of how I stretched the wheel opening:

The vertical black mark indicated the old centerline of the wheel opening with the weld being the new centerline. I stretched it 3.5 inches forward.

bigboi328 · 10-09-2014, 10:30 AM

Thanks for the response. But I dont have to stay with the tire size. I can go down in size but what size. I hate the skinny rubber band look but dont want to heavily modify the truck. I want to fill the wheel well. And what length on the wheel studs.

Cooper197 · 10-09-2014, 11:14 AM

I have 255/45ZR20 on the back of my truck. It has 3 inch drop springs and everything clears wonderfully!

NEWFISHER · 10-09-2014, 11:21 AM

Skinnier rubber bands or start modifying to accommodate the larger tires. Porterbuilt makes a longer trailing arm that might be a simple solution ( with driveline, brake line etc) to run the bigger tires and have then clear.

vin63 · 10-09-2014, 11:32 AM

Quote:

Originally Posted by Cooper197

I have 255/45ZR20 on the back of my truck. It has 3 inch drop springs and everything clears wonderfully!

Yep, that would be more than 2" reduction in overall tire diameter from the OP's tire size.

bigboi328 · 10-09-2014, 12:35 PM

Thanks. Thats what I need. I will get some prices on the lower profile tires. I wonder if I take them to a used tire shop can a trade used for used. Hell even spend a little for newer tires.

bigboi328 · 10-09-2014, 12:37 PM

Cooper197 do you have enough clearance to do a 3/5 drop. I would like the rear fender just over the rim.

Cooper197 · 10-09-2014, 01:58 PM

Quote:

Originally Posted by bigboi328

Cooper197 do you have enough clearance to do a 3/5 drop. I would like the rear fender just over the rim.

I'm at a 2.5/3 inch drop currently. I can't go measure things to make sure, as I am away at school in a different state than my truck, but I'm 95% sure that there is space to go to a 5" drop in the back.

bigboi328 · 10-09-2014, 02:20 PM

What about your lugs...did you use a chevy part like off a tahoe or just go to autozone. I want my truck tricked out...im excited. ...im going to get some bus stop *****es...the truck isn't nice enough for regular *****es.

Cooper197 · 10-09-2014, 02:34 PM

The lugs were actually the ones on it when I got the truck. They fit with those wheels, so I used them! They are just standard acorns.

Slow Build · 10-09-2014, 02:57 PM

Your cheap 20" wheels will cost you some money if you want to run them. You'll need to new tires as said. Also, most of the 20" wheels have more back spacing for the newer vehicles. This means that you might need to run fairly thick spacers. And yes the lug nuts are different sizes. You will want to ask for lug nuts to fit your truck, not a Tahoe.

Here is a tire size calculator to figure out tire sizes.
http://tire-size-conversion.com/tire-size-calculator/

chevy_mike · 10-09-2014, 05:33 PM

Make sure you have enough threads on the lugs with these wheels. The panel I bought, the reason it was being sold was the guy had put on aftermarket 22" wheels with stock studs and one of the wheels fell off because not enough thread engagement. Damaged the driver rear corner of the panel and was pissed off he sold it.

bigboi328 · 10-09-2014, 05:45 PM

Wow i would kill that guy..but thats why im asking. The back spacing is perfect. But the tire is too tall and lugs seem short. I will go with a lower profile tire and ill need to replace my lugs until I get a brake kit

10-09-2014, 01:10 AM	#1
bigboi328 Registered User Join Date: Oct 2010 Location: SAN ANTONIO Posts: 46	20 inch wheel probloms I need help on my 65 c10 short fleet. I picked up a set of 20's for cheap and came with tires. The old tires are 275/60/15 with a o.d of 27.99 inches and the new set is 275/55/20 with a od of 31.91inches. My question is i am rubbing on the front of the rear fender and my lugs look like they may not fit. Any answers anything and i also was going to replace the springs any sizes. Attached Images

10-09-2014, 06:37 AM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 20 inch wheel probloms That is a big tire. When I did my 65 i pulled the drums and put longer studs in and then bought new nuts with correct taper to match the wheels. You will have to trim the lip in the wheel well to fix the rub. You will find your speedometer is going to be several mph off to the slow side. On mine I could not get a tire near that big to work on the front. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

10-09-2014, 08:22 AM	#3
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: 20 inch wheel probloms 31-32" tall tire is really tall for our trucks, particularly when lowered - as that positions the rear axle line forward as a result of the arch of the trailing arms. I run a 31" tall tire on the rear of my truck, but I modified the bed and wheel wells to run a 33" tall tire (to accommodate tire growth when I drag race it). I also run a CPP lowered trailing arm cross member that helps with the geometry. Here's an old photo of how I stretched the wheel opening: The vertical black mark indicated the old centerline of the wheel opening with the weld being the new centerline. I stretched it 3.5 inches forward. __________________ 1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes

10-09-2014, 10:30 AM	#4
bigboi328 Registered User Join Date: Oct 2010 Location: SAN ANTONIO Posts: 46	Re: 20 inch wheel probloms Thanks for the response. But I dont have to stay with the tire size. I can go down in size but what size. I hate the skinny rubber band look but dont want to heavily modify the truck. I want to fill the wheel well. And what length on the wheel studs.

10-09-2014, 11:14 AM	#5
Cooper197 Registered User Join Date: Jul 2014 Location: Eugene, Oregon Posts: 199	Re: 20 inch wheel probloms I have 255/45ZR20 on the back of my truck. It has 3 inch drop springs and everything clears wonderfully!

10-09-2014, 11:21 AM	#6
NEWFISHER Registered User Join Date: Sep 2012 Location: Oregon Posts: 3,303	Re: 20 inch wheel probloms Skinnier rubber bands or start modifying to accommodate the larger tires. Porterbuilt makes a longer trailing arm that might be a simple solution ( with driveline, brake line etc) to run the bigger tires and have then clear. __________________ GOD BLESS AMERICA!

10-09-2014, 12:35 PM	#8
bigboi328 Registered User Join Date: Oct 2010 Location: SAN ANTONIO Posts: 46	Re: 20 inch wheel probloms Thanks. Thats what I need. I will get some prices on the lower profile tires. I wonder if I take them to a used tire shop can a trade used for used. Hell even spend a little for newer tires.

10-09-2014, 12:37 PM	#9
bigboi328 Registered User Join Date: Oct 2010 Location: SAN ANTONIO Posts: 46	Re: 20 inch wheel probloms Cooper197 do you have enough clearance to do a 3/5 drop. I would like the rear fender just over the rim.

10-09-2014, 02:20 PM	#11
bigboi328 Registered User Join Date: Oct 2010 Location: SAN ANTONIO Posts: 46	Re: 20 inch wheel probloms What about your lugs...did you use a chevy part like off a tahoe or just go to autozone. I want my truck tricked out...im excited. ...im going to get some bus stop ***es...the truck isn't nice enough for regular ***es.

10-09-2014, 02:34 PM	#12
Cooper197 Registered User Join Date: Jul 2014 Location: Eugene, Oregon Posts: 199	Re: 20 inch wheel probloms The lugs were actually the ones on it when I got the truck. They fit with those wheels, so I used them! They are just standard acorns.

10-09-2014, 02:57 PM	#13
Slow Build Registered User Join Date: Sep 2009 Location: California Delta Posts: 2,163	Re: 20 inch wheel probloms Your cheap 20" wheels will cost you some money if you want to run them. You'll need to new tires as said. Also, most of the 20" wheels have more back spacing for the newer vehicles. This means that you might need to run fairly thick spacers. And yes the lug nuts are different sizes. You will want to ask for lug nuts to fit your truck, not a Tahoe. Here is a tire size calculator to figure out tire sizes. http://tire-size-conversion.com/tire-size-calculator/ __________________ Name: Rich Current Ride: 1964 C-10 Short Fleetside Daily Driver: 2005 GMC crew cab short fleetside /2001 Chevy Tahoe Past GM Trucks: 1959 GMC short stepside 1968 GMC short stepside-4x4 1973 Chevy short stepside 1989 Chevy short fleetside-reg cab 1993 Chevy short fleetside-Xcab 2002 Chevy short fleetside-Xcab Save the dinosaurs, use synthetic oil.

10-09-2014, 05:33 PM	#14
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: 20 inch wheel probloms Make sure you have enough threads on the lugs with these wheels. The panel I bought, the reason it was being sold was the guy had put on aftermarket 22" wheels with stock studs and one of the wheels fell off because not enough thread engagement. Damaged the driver rear corner of the panel and was pissed off he sold it. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

10-09-2014, 05:45 PM	#15
bigboi328 Registered User Join Date: Oct 2010 Location: SAN ANTONIO Posts: 46	Re: 20 inch wheel probloms Wow i would kill that guy..but thats why im asking. The back spacing is perfect. But the tire is too tall and lugs seem short. I will go with a lower profile tire and ill need to replace my lugs until I get a brake kit

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