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Need help on Rim size

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Old 01-10-2013, 09:51 AM
Gibby55
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Need help on Rim size

I am going to put a 20" x 10" rim on my rear and a 18" x 8" rim on my front. I need help figuring out my offset for these rims. I am putting the 3" wider rear fenders on the truck as well and I want the rear tire to be just tucked inside the fender.

I have a mustang II front end and a thunderbird irs rear end. The rear is the same width as your standard rear-ends on these trucks.

Even pictures of your rides with your rim dimensions would be greatly appreciated.
 
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Old 01-10-2013, 01:56 PM
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Not sure how wide your rearend is, but your front should be the same as mine. I am running 15 x 7's on the front of my 55 with a Mustang II and I opted for 3.5 backspace on those. I have 15 x 9's on the back and went for 5.5 backspace on those, with the Mustang 9 inch which I believe measured 59"-60" flange to flange. I probably could have gone wider on the back, but I was afraid that the inside of the rim may rub the e-brake cable on the rear discs. I am only running standard fenders on the rear. Pop into my garage to look at my setup.

pat
 
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Old 01-10-2013, 02:56 PM
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Pat, this might help.... follow the link to the forum



Homemade Tire Fitment Tool
 
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Old 01-10-2013, 07:26 PM
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John, that looks like an easy way to figure the needed back space, Garry
 
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Old 01-10-2013, 09:51 PM
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Originally Posted by jniolon View Post
Pat, this might help.... follow the link to the forum



Homemade Tire Fitment Tool
Thanks! I'm in the same boat, so this helps.
 
  #6  
Old 01-10-2013, 10:41 PM
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Hey Gibby,
My only advice on tire/wheel size - go slowly carefully through this one especially for the front tire clearance. We also have a Mustang II IFS with standard spindles.

We started out with 255-45-18's on the front - that's 27 inch diameter & 10 inch width. That did not work - the tires rubbed on the dips & turns & alignment shops couldn't get the front end camber correct - the tire didn't fit in the fenders. We finally went with 215-45-18's - diameter 25.6 inches & an 8.5 inch width - that worked.

Here's our link on tire/wheel size frustration - lot's of good advice..
https://www.ford-trucks.com/forums/1...re-advice.html


Ben in Austin
1950 F1
 
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Old 01-11-2013, 02:03 AM
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Old 01-11-2013, 01:46 PM
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dan,

great website.... bookmarked !!!

thanks
j
 
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Old 01-11-2013, 04:37 PM
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Thanks for all the great help. Guess I have to put the truck bed back on the truck. lol
 
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Old 01-11-2013, 07:05 PM
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Originally Posted by ben73058 View Post
Hey Gibby,
My only advice on tire/wheel size - go slowly carefully through this one especially for the front tire clearance. We also have a Mustang II IFS with standard spindles.

We started out with 255-45-18's on the front - that's 27 inch diameter & 10 inch width. That did not work - the tires rubbed on the dips & turns & alignment shops couldn't get the front end camber correct - the tire didn't fit in the fenders. We finally went with 215-45-18's - diameter 25.6 inches & an 8.5 inch width - that worked.

Here's our link on tire/wheel size frustration - lot's of good advice..
https://www.ford-trucks.com/forums/1...re-advice.html


Ben in Austin
1950 F1
Are the 10" and the 8.5" rim widths or tire widths?
 
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Old 01-11-2013, 11:56 PM
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Hey Tom,
That's tire widths in my description above. I had no issues with 10 inch wide tires in the back but up front for me with my IFS set up it wasn't happening. I should have gone with something smaller than 18 inch wheels up front but I was getting tired - so.. I just got smaller tires that would work on the same wheel.

In the long run I'm not a fan of running such low profile tires on a truck - 16 or 17 inch wheels with a higher profile tire would be a better ride.

Ben in Austin
1950 F1
 
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Old 01-12-2013, 12:00 AM
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Originally Posted by ben73058 View Post
Hey Tom,
That's tire widths in my description above. I had no issues with 10 inch wide tires in the back but up front for me with my IFS set up it wasn't happening. I should have gone with something smaller than 18 inch wheels up front but I was getting tired - so.. I just got smaller tires that would work on the same wheel.

In the long run I'm not a fan of running such low profile tires on a truck - 16 or 17 inch wheels with a higher profile tire would be a better ride.

Ben in Austin
1950 F1
What are you running for rim widths? Thanks!
 
  #13  
Old 01-12-2013, 12:12 AM
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Hey Tom,
The wheels we went with were 18x8.5in., 4.5in. backspace, 6mm offset.
My son liked these wheels - not exactly what I'd pick but he's happy.
Summit Racing® Legend 5 Series Chrome Wheels SUM-142-8865C6 - SummitRacing.com

Ben in Austin
1950 F1
 
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Old 01-13-2013, 07:55 PM
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Originally Posted by ben73058 View Post
Hey Tom,
The wheels we went with were 18x8.5in., 4.5in. backspace, 6mm offset.
My son liked these wheels - not exactly what I'd pick but he's happy.
Summit Racing® Legend 5 Series Chrome Wheels SUM-142-8865C6 - SummitRacing.com

Ben in Austin
1950 F1
Actually, I like those rims quite a bit and wish they'd work for me. 4" is about the maximum back-spacing I can use. Unfortunately, the ones with 3.5" BS are 15" wheels and only come in a skinny size which would work on the front but not on my back as I have the 3" wider rear fenders and want a larger diameter wheel. I may have to go to steel wheels. I'm in no hurry, so I'll see what transpires.
 
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