Need help on tires
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Junior User
Joined: Apr 2006
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Need help on tires
Looking to upgrade tires. I want to stay with the stock rims for now. what is the biggest size I can safely put on there?
what is the difference between 285-75-16 and 305-70-16 and will they both fit.
thanks for your help in advance
2001 F350 cclb 4x4
what is the difference between 285-75-16 and 305-70-16 and will they both fit.
thanks for your help in advance
2001 F350 cclb 4x4
Postmaster
Joined: Aug 2006
Posts: 2,829
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Originally Posted by Big tmiller
Looking to upgrade tires. I want to stay with the stock rims for now. what is the biggest size I can safely put on there?
what is the difference between 285-75-16 and 305-70-16 and will they both fit.
thanks for your help in advance
2001 F350 cclb 4x4
what is the difference between 285-75-16 and 305-70-16 and will they both fit.
thanks for your help in advance
2001 F350 cclb 4x4
The 285/75R16's require a 7.5" wide rim, but you should have no problem running these on your stock wheels. Just make sure the tire load range is suitable for your truck.
Cargo Master
Joined: Feb 2005
Posts: 2,837
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ok, here's a quick lesson down and dirty...on a 285 75 16, the tire is 285mm wide, will fit on a 16" wheel. Now the 75 is a percentage of the first number, in this case 285 x .75 = 213.75, which represents the sidewall height. So, basically the measurement from the outside of your rim to the outside of the tire is 213.75mm. So, that being said, the 305 70 16 is 20mm wider. And if you do the math, you will actually find that it is just a tiny bit shorter than a 285 75 16 (.25mm to be exact). However, just because a manufacturer slaps a number on the side of a tire doesn't mean it's exactly that size, they really just label it whatever it is closest to. But thats not really something we as the consumer can control. I run 285 75 16 on my truck. I am thinking of stepping up to a 295 75 16, but I wouldnt really want to run a 305 70 16 without stepping up to a 7.5" wide wheel. So, put simply the 285 75 16 is pretty much the same height as a 305 70 16, but a little narrower, and therefore safer for your stock wheels. Good luck.
Bob
Bob
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Joined: Mar 2007
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From: Pa
285's and 305's are the exact same diameter, but the 305 is about 1" wider than the 285. The 305 tires usually have a reduced weight capacity compared to 285's and there is a very good chance of rubbing as well.
285s are a perfect fit for a 99'-04' SD IMO. 295's are a tad wider than the 285's but should not rub.
Guys have mounted 315;s on stock rims with no problems already, however 305's would be the widest I'd go on stock rims.
285s are a perfect fit for a 99'-04' SD IMO. 295's are a tad wider than the 285's but should not rub.
Guys have mounted 315;s on stock rims with no problems already, however 305's would be the widest I'd go on stock rims.
Tuned
Joined: Mar 2005
Posts: 330
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From: SW Oklahoma
Originally Posted by dkf
285's and 305's are the exact same diameter, but the 305 is about 1" wider than the 285. The 305 tires usually have a reduced weight capacity compared to 285's and there is a very good chance of rubbing as well.
This is true with some brands/models of tires, but not neccesarily so with others. It's wortwhile to look up the exact stats on the tire(s) you're interested in, so you'll know the exact sizes, load ranges, max weight capacity and inflation pressure, etc...
