tire size
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tire size
Ok so am looking to get a 250 this year and am interested in what the difference is between the 18 and 20" tires? Am moving up to be able to tow my boat and put my bike in the bed, so am new nto then larger trucks but mwant to make the best choice, just want to know what the differences are.
thanks inadvance!
thanks inadvance!
Resident smarta$$
Joined: Aug 2006
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From: Oaks,PA
2 inches
Sorry couldn't resist! Seriously I think tire size on the 20's is @ 34" tall I would goess the 18" are slightly less, like 33.5ish
Sorry couldn't resist! Seriously I think tire size on the 20's is @ 34" tall I would goess the 18" are slightly less, like 33.5ish
Last edited by D8chumley; Jan 19, 2008 at 08:05 AM.
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Joined: Oct 2004
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From: Seminole, FL
Hey Boatflounder,
I just replaced my stock Continental 275/70/18s with Nitto Terra Grappler 285/65/18s. The 285/65s are about 1/2" smaller diameter than the 275/70s.
The way to figure the height of the tire is multiply the width (285mm) x the ratio (0.65) = 185.25mm. Then convert to inches by dividing by 25.4 = 7.29. This is the sidewall height.
If you double this and add it to the wheel diameter you have a pretty close estimate of the tire height. 7.29x2=14.6 plus 18 = 32.6 inches high.
From this you can see that if you have a 20 inch wheel but the tire height is the same then the difference is the sidewall height.
I doubt if you could tell by driving the truck if it has 16, 17, 18, or 20 inch wheels. 20" with less sidewall may ride a little rougher since there is 1" less "flex" but I don't know.
Either one should be fine for towing a boat.
Hope this answers your question.
I just replaced my stock Continental 275/70/18s with Nitto Terra Grappler 285/65/18s. The 285/65s are about 1/2" smaller diameter than the 275/70s.
The way to figure the height of the tire is multiply the width (285mm) x the ratio (0.65) = 185.25mm. Then convert to inches by dividing by 25.4 = 7.29. This is the sidewall height.
If you double this and add it to the wheel diameter you have a pretty close estimate of the tire height. 7.29x2=14.6 plus 18 = 32.6 inches high.
From this you can see that if you have a 20 inch wheel but the tire height is the same then the difference is the sidewall height.
I doubt if you could tell by driving the truck if it has 16, 17, 18, or 20 inch wheels. 20" with less sidewall may ride a little rougher since there is 1" less "flex" but I don't know.
Either one should be fine for towing a boat.
Hope this answers your question.
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