Usable tire size

shawn deere

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hey guys, gettin some new shoes for old red. Wondering how big a tire i can run with stock height without loosing any turning radius.
1990 f350 4x4
20" wheels
5" offset
9" width

Kinda thinking a 285-55-20

Any thoughts are welcome

Thanks!
 

pelky350

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With 2 inch level kit on my f350 I run 315,75-16 with a set of basic aluminium rims no rubbing at any time stop to stop. I'm not sure the offset but I think they are like stock replacement rims just slightly bigger holes than the Alcoa ones
 

shawn deere

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With 2 inch level kit on my f350 I run 315,75-16 with a set of basic aluminium rims no rubbing at any time stop to stop. I'm not sure the offset but I think they are like stock replacement rims just slightly bigger holes than the Alcoa ones
Did it rub before the leveling kit?
Thats 34.6" tall and 12.4" wide
 

shawn deere

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IMO, one should not run bigger than 17" rims on these trucks
Currious as to why.
I have braced myself for the cost of the tires. I know more rim might make it ride a little harder. But its a 1 ton. Shes not smooth.
The offest is a little concerning to me though.

Thanks for the input guys!
 

Pullet

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I want as much air in my tires as possible, so my rubber can squish farther before I end up buying new tires over a pothole, so I will probably always stay at or below 17". 16s on there now, because they're cheap and easy.

Truck had 16.5"x~12" rims when I got it, and 35s on them which rubbed on the front springs about 1/2 turn before lock. No spacers.
 

DaveBen

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Have you guys picked up one of those 17 + rims? They are HEAVY and that is unsprung weight. Your shocks will get a real workout using these rims. No Thank You!
 

Pullet

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I absolutely recommend correct tire pressure for load, have been meaning to get a IR thermometer to get more precise; more balloony soft-riding sidewall not getting pinched by the rim on a pothole is my aim.
Air and rubber also weighs less than metal, which matters more to me than cornering stiffness.
If I found some motorized spinners (..still spinning!..)or programmable LED rims that could write or display symbols, I might be tempted to get an extra set of wheels regardless of rim size.
 

Pullet

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I scored cheap steel wheels instead of expensive 16.5"xbig rubber..
You have 20s and a pretty good idea on outside tire diameter (~33" without lifts)/dimensions, or you could sell those and look for 16/17s.. some people like the way big wheels look, though I think that's about the only reason to use them.
 

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