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What wheel and tire will fit?
#1418685 Thu Jul 29 2021 10:27 PM
Joined: Sep 2019
Posts: 221
R
'Bolter
I'm using a 1981 Camaro 10 bolt on my '50 3100. I'm trying to determine what offset/backspacing wheel I can get between the wheel mounting surface and the fender. I have 5" from the mounting surface to the inside fender surface/bed side...I have just under 6" from the mounting surface to the rolled lip on the outer side of the fender. I want to use at a minimum an 8" wide wheel. I would like to use a 255/70 tire on a 18" wheel. I'm trying to get as much wheel and tire under the fender without tubbing the box. I've never had to measure offset/backspacing. I want to be correct when I make my purchase...too late then if I was wrong! I assume that 1/2" to 3/4" would be enough clearance on each side?
I have to believe you high performance "bolters" can advise me correctly.

Re: What wheel and tire will fit?
Rocket man #1418689 Thu Jul 29 2021 11:19 PM
Joined: Jul 2000
Posts: 1,333
G
Insomniac
I have a '78 Camaro rear end with 15 x 7 wheels. Wheel backspace is 4.25". Tires are 205 75R15.

I occasionally get a slight bit of rubbing on the box sides - just enough to make a mark without removing the paint. I don't think that tires 50 mm wider than what I have now would fit without modifying the fenders. (I'm presuming that the 8" wheels will have a 4.5" backspace - you need to confirm)

Last edited by Gord&Fran; Thu Jul 29 2021 11:22 PM.

Gord
----
1954 1/2 ton 235 4 speed
Re: What wheel and tire will fit?
Rocket man #1418696 Thu Jul 29 2021 11:58 PM
Joined: Feb 2004
Posts: 23,207
H
'Bolter
One major drawback to a tire that wide is going to be VERY squirrely handling every time it rains. There's just nowhere near enough weight on the back end of a stovebolt pickup to keep a wide tire planted tight to wet pavement. Maybe if you made the bed floor from 3/8" steel plate- - - - - - -!!!!!!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: What wheel and tire will fit?
Rocket man #1420616 Sat Aug 14 2021 04:51 PM
Joined: Apr 2016
Posts: 657
M
'Bolter
Here are the front / rear weights on my stock 53 3100 with no driver. I'm running a Frankland quick change with 12.88 Wilwood disk, Gleason Torson diff. I had Frankland (and Wilwood) make it so my mounting surfaces would be the same as stock. I also don't want to tub the bed. In most classes I'm limited to an 11.5" tire and want to run a 10" to 11" tire. I'm getting a price worked up now on widening the fenders 2" and having an inner fender liner made from donor fenders. If I have a tire come apart I don't want it to ruin my paint. I'll let you know when I get a price. My skill level is not that good to do it myself. I was very surprised that my truck was so well balanced. I have always been told that pickups were light in the back. With todays all weather tires I think I will be fine. I don't plan on "racing in the rain" which is a great book by the way. Thank you for your time.

Attached Files
truck scale front, rear.jpg (208.39 KB, 118 downloads)
Last edited by mick53; Sat Aug 14 2021 04:53 PM.

Old enough to know better, too young to resist.
Re: What wheel and tire will fit?
Rocket man #1420660 Sun Aug 15 2021 01:13 AM
Joined: Dec 2014
Posts: 823
M
'Bolter
I used an 8-inch-wide wheel with 4-1/4" backspacing and 10-inch wide tire (at the sidewall), which gave me slightly less than 1-inch of clearance on the inside and the outside.

For measurements of any size tire you might consider, visit this web page:

https://tiresize.com/


1951 Chevy Panel Truck
Re: What wheel and tire will fit?
Rocket man #1420798 Mon Aug 16 2021 05:09 AM
Joined: Sep 2019
Posts: 221
R
'Bolter
MiraclePieCo...so are you stating that what I stated in my post that a 8" wheel with 4 1/4" backspace should work? (I won't hold you to it). Thanks for the chart reference.

Re: What wheel and tire will fit?
Rocket man #1420799 Mon Aug 16 2021 05:18 AM
Joined: Sep 2019
Posts: 221
R
'Bolter
MiraclePieCo...After reviewing the tire chart, I believe I'll stick with a 255/50/R18 for a rear tire. I like the fact that the width of the tire is 10"...should fill up the fender fine AS LONG AS I GET THE RIGHT OFFSET ON A 8" WHEEL!

Re: What wheel and tire will fit?
Rocket man #1421218 Fri Aug 20 2021 05:31 AM
Joined: Dec 2014
Posts: 823
M
'Bolter
I'm guessing your 255/50/18 will be perfect - as long as your wheel has the right offset/backspacing. Try the wheel on the truck first without the tire; as long as you haven't mounted a tire the wheels are still returnable.


1951 Chevy Panel Truck
Re: What wheel and tire will fit?
Rocket man #1421236 Fri Aug 20 2021 01:14 PM
Joined: Mar 2007
Posts: 1,389
T
Crusty Old Sarge
Rocket man, you may want to look at this guide. It's a calculator to help determine the back space of your wheel. Hope it helps.

http://www.gtsparkplugs.com/Backspace-Offset-Calculator.html

Last edited by TUTS 59; Fri Aug 20 2021 01:14 PM.

Craig

Come, Bleed or Blister something has got to give!!!
59' Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

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