Temporary tire size difference
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From: Brockport USA
Temporary tire size difference
I have a 79 F250 4x4 that I am sending to the Welder to have a Dana 60 removed from the rear, and a Dana 70 with duallys installed. My question is: Can I drive the truck home from the Weld shop with 16.5 Duallys on the back, and 16 inch on the front, as long as the front drive shaft is removed? I will put 16.5's all the way around before I put the front drive shaft back in, but I need to drive it home before I do the tire size change on the front.
Thanks
Thanks
Postmaster
Joined: Dec 2002
Posts: 3,959
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From: USA
If the front shaft is removed, or if the hubs are unlocked and the t-case is in 2wd, you can drive with different size tires front to rear no problem. So far you've only talked about the rim size. It is possible to have 16" and 16.5" rims with the same diameter tire on both of them. Might want to check that out.
Postmaster
Joined: Dec 2002
Posts: 3,959
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From: USA
Im not sure how tall 9.50-16.5's are. I'll guess somewhere around 31" tall.
235/85-16's are a common truck tire size and are about 31.5" tall. 265/75-16's are also about 31.5" tall but are wider than 235's and work best on a wider wheel. 215/85-16's and 225/85-16's are sometimes used on duallies because of thier narrower width so the tires don't rub eachother when loaded, but 235's are also common on duallies as well. My old Chevy dually with Dana 70 rear end had 235/85-16's. The 265's may be too wide for a dually without spacers between the wheels.
Here's a formula to convert metric sizes to inches:
TireDia(in inches) = ((2 x SectionWidth x AspectRatio) / 2540) + WheelDia.
On a 235/85-16 tire, 235 is the SectionWidth in millimeters and 85 is the AspectRatio, which is a Percent of the SectionWidth.
To find width, divide the SectionWidth by 25.4, which is how many millimeters are in an inch. A 235mm tire is about 9.25" wide.
On tires with the same AspectRatio number, as width increases so does hieght, because the height is a percentage of the width.
235/85-16's are a common truck tire size and are about 31.5" tall. 265/75-16's are also about 31.5" tall but are wider than 235's and work best on a wider wheel. 215/85-16's and 225/85-16's are sometimes used on duallies because of thier narrower width so the tires don't rub eachother when loaded, but 235's are also common on duallies as well. My old Chevy dually with Dana 70 rear end had 235/85-16's. The 265's may be too wide for a dually without spacers between the wheels.
Here's a formula to convert metric sizes to inches:
TireDia(in inches) = ((2 x SectionWidth x AspectRatio) / 2540) + WheelDia.
On a 235/85-16 tire, 235 is the SectionWidth in millimeters and 85 is the AspectRatio, which is a Percent of the SectionWidth.
To find width, divide the SectionWidth by 25.4, which is how many millimeters are in an inch. A 235mm tire is about 9.25" wide.
On tires with the same AspectRatio number, as width increases so does hieght, because the height is a percentage of the width.
Last edited by SoCalDesertRider; Jul 8, 2004 at 11:33 PM.
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