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Discussion Starter #1
Okay so tires kinda confuse me so bear with me lol, I currently have worn out 265/75/16s on my 03 f350. They look too small, so I wanted to move up to 35s. Which I think is a 315/75/16. So the tire guy says my rims are "7" wide and I need a "7.5" wide rim, otherwise he says it will cause a blowout, I thought if I kept the last two numbers the same it was okay, anyways I didn't really get what he meant, I don't doubt him though, so what "size" rim would I need to buy, a 7.5 x 16" rim?? As in how are rims measured...
 

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265/75R16 is 31.6 inches tall, 10.4 wide with a 7.8 inch sidewall height. 99.4 inch circumference, and 638 revs per mile.

315/75R16 is 34.6 inches tall, 12.4 wide with a 9.3 inch sidewall height. 108.7 inch circumference and 583 revs per mile.

with a 315 tire, i would use 9 inch wide rim.

that is a pretty big jump in tire size, and the 315's may not fit without a lift kit.

i would consider a 285/75R16

at 32.8 tall 11.2 wide 8.4 sidewall 103.1 circumference and 615 revs per mile it will fit much better.
 

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Discussion Starter #3
Thank you for the explanation, it's got a flatbed on the back with tonnes of space there, I think the front would maybe have to be leveled, which I'd be okay with, but I do have to figure out if it would move the flatbed up to an unpractical level, do you think I'd notice a significant mpg loss with the 35s compared to mine? Maybe I should just keep it stock 😕
 

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265/75R16 is 31.6 inches tall, 10.4 wide with a 7.8 inch sidewall height. 99.4 inch circumference, and 638 revs per mile.

315/75R16 is 34.6 inches tall, 12.4 wide with a 9.3 inch sidewall height. 108.7 inch circumference and 583 revs per mile.

with a 315 tire, i would use 9 inch wide rim.

that is a pretty big jump in tire size, and the 315's may not fit without a lift kit.

i would consider a 285/75R16

at 32.8 tall 11.2 wide 8.4 sidewall 103.1 circumference and 615 revs per mile it will fit much better.
:whs:

I am running Toyo 285/70R16 on stock rims. Only had to shim front bumper about 1" to clear tire and I do not have a lift.
 

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flatbed will be fine. it is the front bumper that hits. the lift is more for turning radius to get the springs on a different angle so the tires do not rub.
and yes, the 35's would kill gas mileage if you do a lot of around town driving. on highway it would stay about the same, or go up a little if you do a lot of driving t set speed.
 

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Fibyloin,

I run 285/75R16 with the stock rims on my truck and they seem to do just fine. I don't think my truck has a lift and I haven't had any problems with catching the front bumper or rubbing springs when I turn. I got the load range E for better weight capacity. My summer time mileage is around 20 MPG unloaded.

Cj
 

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A lot of guys run 285s on the factory alloys with no lift/leveling but when I put them on mine they rubbed in front while turning. I had to pull the fender liners back with washers and all thread. Also Discount Tire will not put 285s on our rims. When my 285s wore out I bought a set of 18" Lariat wheels off ebay which were available as an option on the late 2004 trucks and have the same offset as our stockers, (Harley Davidson and SVT wheels are the same). I put 275/70/18s on them, they fit, ride and look great. The 285s were a bit bigger but I prefer to stay as stock as possible and this was a nice compromise for me as it was made to fit my truck by Ford.
 

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as a note, i was referencing the 315's when i was talking about fit and lift.

285's will fit with no lift and also fit the stock alloy rims.
 
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