I own a 2000 F250 4X4 with the original 16" aluminum wheels with 265X75X16 tires. What larger size of tire will fit the factory wheels and would I need to change my wheels if I wanted 305X75X16 tires. Thanks for the help.
You can check tire manufacturers' websites for wheel width requirements. Your truck's wheels are probably 7" wide -- too narrow for 305's. In fact, if you follow manufacturers' specs, they're too narrow for most 285's.
Changing from 265's to 305's will upset your truck's speedometer and odometer electronic calibration, and may also affect shift points if you have an AT. You might want to consider having a dealer recalibrate your speedo/odo.
Your stock rims will fit 305's just fine. Have 295/75/16 BFG all terrain's on mine, no problems and no rubbing.If the speedo is off at all it is so minute that you wont even notice it. The truck looks much nicer with the larger tires.
I have had a problem trying to find replacements for the 265/75R16s those Firestone Steeltex ATs. Why would Ford put a tire on this fine truck that Nobody has a replacement except Firestone. I cannot find any other manufactures that have this size in a Load Range "E".
Anyone else found a good replacement? I have had "radial pull" on the last set of Steeltex ATs and I'm not giving Firestone any more of my money.
Changing the tire size from 265/75R16 to 305/75R16 will cause the speedo & odo to read about 7-1/2% low.
It’s worth keeping the load range designations in perspective. The “E” range for any given tire just means it can be safely inflated to 80 psi, and the manufacturer certifies its load capacity at that pressure. Similarly, a “D” range designation is for load capacity @ 65 psi, and a “C” range is for load capacity @ 50 psi. A tire’s actual load capacity is based on a combination of size and the “load range” designation.
For example, a 235/85R16E is rated at 3,024 lbs @ 80 psi. The 265/75R16E, a larger tire of essentially the same rolling radius and the same “load range”, is rated at 3415 lbs @ 80 psi. The 265/75R16D, a lightly larger tire but with a lower “D” range rating, is rated at 3300 lbs @ 65 psi.
The point here is my suggestion that you determine your load requirements (separately weight the front and rear axles of your loaded truck), add a safety factor, and purchase the correct size and load range to meet your requirements and/or preferences. In addition to the “E” tires, you may find a broad range of styles, prices and availability in the “D” range that are suited to your GVWR.
You seem to be very informed about tire sizes and load capacities. can you assist me with a few questions??
I have a 2001 F-350 Crew Cab with the factory Deluxe Alloy Wheels. I have been told that the Factory wheel for 2001 is an 8" x 16" is that true???
Can you put a 315/75R16 tire on that wheel??
What is the negative inpact of oputting a tire that is larger than the size capacity of the rim??
for example if the factory rim is in fact a 7" x 16 then what is the negative impact of using the 315/75R16 or a 305/70R16??
What is the ture size difference between these two sizes for example???
I would be very appreciative of any assistance you can provide.
Please E-Mail me at IDKwhy(No Email Addresses In Posts!), if you can shed any light on this for me
Thanx - IDK
[font size="1" color="#FF0000"]LAST EDITED ON 02-Mar-01 AT 11:34 AM (EST)[/font][p]1) To the best of my knowledge, the 2001 wheels are still 16 X 7.
2) BFGoodrich recommends a wheel width of 8 to 10 inches for the 315/75R16.
3) The negative impact of putting a tire on a rim that’s too narrow is that the tire beads are “pinched” by the rim, causing it the tread to curl from side-to-side. Reducing air pressure will flatten the tire, but may subject the tire to excessive heat build up and reduce your fuel economy. Many reputable tire shops won't mount tires on improperly sided rims.
4) The 265/75R16 has a nominal diameter of 30.7 inches (654 revs per mile). The 315/75 is 34.7 inches, or 599 revs per mile. The lowest recalibration setting for the SD speedometer/odometer is either 600 or 601 revs per mile.
The tire manufacturers post a lot of information on their web sites. www.bfgoodrichtires.com and www.dunloptire.com are two good places to visit.
To help answer the question about another brand of tire that is a 265/75R/16 E, I believe that Michelin makes it in a LTS version which is essentially an all-season tire.
My question is: how does the static height of a 265/75R/16 compare with a 235/85R/16? All the specs. that I have seen show that the two are similar but I am concerned that the difference may interfere with the auto's calibrations. I like the look of the wider tire but I wonder if it is worth the headaches?
Anytime you change Tire size you should have the computer recalculated for the tire diameter. Don't forget that this will also change your Gear Ratio.
You can have your dealer perform SSM 11789 & 11790. Besure to find your Revs/mile from the tire manufacturer. This is the critical variable for the reprogramming.
[font size="1" color="#FF0000"]LAST EDITED ON 02-Mar-01 AT 02:30 PM (EST)[/font][p]Dunlop says the static radius for the AT in size 235/85R16 is 14.7 inches on a 6.5 inch rim; 668 revs/mile. Their 265/75R16 is 14.5" on a 7.5" rim; 678 revs per mile.
BFGoodrich's site doesn't provide static radius data. Their AT TA-KO in 235/85R16 on a 6.5" rim is 654 revs/mile. The 265/75R16 on a 7.5" rim is also 654 revs/mile. Both tires are nominally 31.8" in overall diameter.
I doubt the AT would notice a 1% or 2% variation. I have Dunlop Radia Rover 285/75R16D tires (658 revs/mile) on my truck, and my speedo and odo are low by 3%. I've not noticed any trans performance issues.
Crewzer, I was wondering how you like the Radial Rovers?? I am considering them for my 250 4x4 and was curious about their overall performance: how did they affect gas mileage? Are they good in snow?? Any info is greatly appreciated. are they mounted on stock rims? If so, how's the fit?
One reason I like my AT's is because I got them on sale at Sears last year for $88 each (not a typo)! They look a lot better than the 235/75R16 OEM General tires that came on the truck.
I have them mounted on the stock Y2K XLT 16 X 7 aluminum rims. They're not too noisy for a mild AT tread design, but they were difficult to balance (but we did eventually manage). I have ~12,000 miles on them and they seem to be wearing well and evenly -- I expect to get 50K miles from them.
The AT's are MUCH more comfortable than the stock Generals. I haven't noticed any particular difference in dry weather performance, but they are significantly better in rain. They seem to be OK in snow and light-duty off-roading but I doubt they can compare to real modern snow tires. I usually carry about 400 lbs of sand over the back axle in winter.
Although the 285's are much wider than the stock 235's, they're also a larger diameter. I haven't noticed any difference in mileage. Another size to consider in the AT model is the 255/85R16.
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