RobGreen
Junior Member
I currently have some Nitto Trail Grapplers on my 2015 Dodge Ram, but sadly it's time to replace them. I am looking at the BFGoodrich KO2's and wanted to see what everyone's thought is on them...
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This comment mentions a minimum air pressure for a tire. I have never heard of a tire, or tire manufacturer, ever listing a "minimum" air pressure for a tire. They always have a maximum air pressure as shown in the chart, but no minimum. If you can provide a link to any chart or notation I would be interested to see it. Many of these tire manufacturers will show load inflation tables that show how much load they can carry and lower pressures. Not uncommon for them to have an E-rated tires with an 80 psi max have load ratings all the way down to 35 or so psi.Just to expand I have had many regular rated bfg's, don't really even remember the rating probably C, and when I was a young man wheeled like a champ even on oem replacement size. The last set I went up in load rating, still like the tire but the ride is a little firm. Perfect if you need it, but I carry 2k pounds in the bed maybe once a year, occasionally rock or dirt loads, and for that few times I would have rather had a lower rating tire. It has zip to do with BFG, my go to tire since 1996, but rather the rating. And load E tires minimum air pressure is higher then C max air pressure, or close, so you can't even adjust the pressure. I believe the lowest E can go is 45psi, but I'm not 100 on that and too lazy to go look, ha. These ratings are across the board, not brand related, but ply related. I know I have many benefits to load E that I am riding, but ride comfort aint one of them.
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Maybe what you are talking about are the recommended pressures for the OEM tires that are listed on every car or truck. That is assuming the vehicle is at GVW or GAWR (max weight that vehicle is designed to carry). I've never heard of a minimum pressure required for a tire or that is increases by 15 psi for each letter. Just depends on the load inflation tables of the tire. For example it's pretty common on a heavy duty pickup with E rated 80 psi max tires to have 80 psi recommended for the rear tires. Obviously if you are running the truck empty you don't need anywhere close to 80 psi in the rear tires, but for liability reasons the manufacturer wants max psi.The "recommended" minimum tire psi increases 15psi for each letter from c to f.
Mine has been on since about a week after buying it. Running E-rated tires at the max 65 psi makes for a rough ride, poor wear, and poor traction especially in the rear when running empty. Running 45 psi front and 35 psi rear on E rated 35x12.50R17s for the last 10k miles. Occasionally pull a 4k lb. trailer for long distances and don't bother adjusting PSI, but will pump up the rears if pulling my 8k-9k lb. trailer for longer distances on the highway.Well, I guess we can ignore our TPMS and run it low. In fact, after this chat I think I'm going to go lower because I have my tire cel n all the time anyhow, I just opted out of TPMS's.