big rim pic requests

[hotroddan]

Lowering my 63 gmc and want to put some bigger rims 18s possibly 20s. Id like to see some pics of peoples wheel and tire combos along with specs on back spacing rim width act.
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[dstarrett]

20 inch Billet Specialties, will hsve to check backspacing

[Dustin07]

whats your total wheel diameter dstarrett? I'm trying to gauge how much wheel/notch combo I need. you're looks perfect for your truck.

[hotroddan]

Those look good. What size tires?
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[dstarrett]

GY Eagle GT II 285/50's rear and 275/45's front. Total dia (aprox inches) 99/rear and 93/front

[Dustin07]

99inch diameter is huge...lol

[hotroddan]

Originally Posted by dstarrett

GY Eagle GT II 285/50's rear and 275/45's front. Total dia (aprox inches) 99/rear and 93/front

whats the rim width and backspacing?

[hotroddan]

Originally Posted by Dustin07

99inch diameter is huge...lol

www.wheelcityusa.com/tires/chart.htm good metric to inch conversion chart

[blackedoutharley]

285/50R20 is 31.3" tall
Section width is 11.1" when mounted on a 9" wheel.

275/45R20 is 29.7" tall
Section width is 10.7 when mounted on a 9" wheel.

Every .5" change in rim width will change section width approx .2"

Specs shown can vary slightly from one tire mfg to another.

[McCoyAZ]

When you swap over to those super sized rims and tires wont there be an issue with braking if you haven't upgraded to larger disc brakes?

[65 on 24s]

Dont know how to post pics from my phone but my 65 is sittin on 24s
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[Dustin07]

this is one of my fav tools for a quick cheat:

http://www.miata.net/garage/tirecalc.html

[65 on 24s]

I found an old post with my pics in it. Here u go. http://67-72chevytrucks.com/vboard/s...d.php?t=352882
Posted via Mobile Device very 1st pic

[hotroddan]

Cool have the tire sizes in check what about backspacing????
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[Chvyman1975]

heres my 62 with 22's. I saw a 66 CL a while back that had 26's on it. It looked like a tractor though.

[dstarrett]

Sorry for delay on backspacing. 5 3/4 rear, 4 1/2 front. Disc brakes front with Fatman frontend. Minor trim of the wheel well lip on rear.

[kieth]

Here is my 66 gmc with 17 x 9 inch cragars, not big by todays standards but I like them cause you can still show some sidewall and I feel these trucks look better with some sidewall instead of band aids for tires .......JMO Kieth

rear tires 265 x 70 x 17 Michelins (very square trear surface, barely clears the fenderwell lip (width of your hand flat) inside the fenderwell the wood has about the same amt of clearance....the real problem is the front lip of the fendersell, we had to reposition the bed support rods so they moved the fenders out at the bottom so they clear (the overall diameter is 30") If you want to use larger wheels and tires I would suggest moving the axle back 1.5" to allow more clearance in this area. Backspacing I do not know but the space from the front hub to the outside of the wheel is 5.5" so back spacing is 3.5".....


front rim is 9" I have a 91 burb front end with McGaughy 2.5" drop spindles the backspacing on the rims is 4.5" with 255/65/17 michelins, with the drop spindles this tire and wheel combo sits about level with fenderwell lip. have not had trouble with it rubbing but I do take sharp driveway entrances slowly.

backspacing is 4.5" distance from hub to oustide of wheel is 4.5"


Here is a picture---by the way the truck rides and drives great......







Here is a link to the clearance issues which I mentioned earlier, we have since moved the body out farther on both sides and I have ordered a longer panhard rod that is adjustable so the rear end and body will be more in the center of their travel and elimanate the side to side fenderwell lip problem. I am still fighting moving the trailing arm crossmember back the 1.5" I spoke of earlier. Wish I had done it while building the chasis it would have been easy simple and clean at that time.......

http://kieth.smugmug.com/Trucks/66-G...813993_qRbvdJX

[64shortc10]

Mines in peices right now but got 22's & 24's!
Tony from Norcal

[shortbed70]

Originally Posted by 64shortc10

Mines in peices right now but got 22's & 24's!
Tony from Norcal

Dude how did you hang your truck from the ceiling??? Lol
Sorry I couldn't resist...
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[64shortc10]

Originally Posted by shortbed70

Dude how did you hang your truck from the ceiling??? Lol
Sorry I couldn't resist...
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Haha I don't know why it does that? I take the pics on my iPhone and email the to my home computer. Then I have to edit them every time and flip them to post on the computer. Then I look from my iPhone and there upside down? Wtf?
Tiny from Norcal
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[joedoh]

mine has 22s, but I may pick up some 16s today!

[Dustin07]

Originally Posted by 64shortc10

Mines in peices right now but got 22's & 24's!
Tony from Norcal

What notch is that, and what is the OD if your wheels? sorry for so many Q's, lol. I want the smallest notch possible to still lay frame on a decent tire, probably 20" rims. looks like you're notch has 2-3 inches of space in there which leaves hope for me that I won't have to raise the bed floor as much as I feared. I'd like to be somewhat usable laid out for home depot runs.

[64shortc10]

Originally Posted by Dustin07

What notch is that, and what is the OD if your wheels? sorry for so many Q's, lol. I want the smallest notch possible to still lay frame on a decent tire, probably 20" rims. looks like you're notch has 2-3 inches of space in there which leaves hope for me that I won't have to raise the bed floor as much as I feared. I'd like to be somewhat usable laid out for home depot runs.

The notch is Porterbuilt Streetrods. It lays frame on a 31 inch tire. He makes smaller notches too.
Tony from Norcal