Discount Tire mounting 12.5 tire on 7.5 rim
I just dropped my Jeep off to Discount to mount my new Nitto Trail Grapplers. The tech said that i am an idiot for tryign to mount a 12.5 tire on a 7.5 rim. I have done my homeowork and seen many Jeep running this set up with no issues so i was pretty angry. After speaking with the manager and showing the forum he made me sign a waiver. They did freak me out a bit though. Will i have any issues with this set up? The Trail Grapplers are rated E grade so the sides are stiff if that makes a difference.
No... As long as you arent trying to run the max tire pressure (dumb to do it the first place) all that is going to do is give you a tighter bead at lower pressure... Ask them what size rim they would recommend when your only running 10 PSI with that tire and see how dumb they feel then.
Start at 30 (I run about 29 on my BFG's) and do the chalk test or adjust according to whether you want a stiffer or softer ride... Best to do the chalk test for even wear though... It all depends on how heavy your Jeep is according to bumpers/winches/lift and whether its a 2dr or 4dr... 30 is a good start pressure though. Off road, I would air down to 10-15psi if needed, i.e. sand, rocks, so on and so forth.
Even myself knowing a lot about tires, it's always a pain in the butt when these "professionals" think they know everything. I had my tires balanced at NTB, and they even gave me a hard time for having my tires at 28 psi and said, "that's good for driving in the sand but not on pavement". Really!? They recommended them at 33 psi. I didn't want to argue with them, but I did tell them that if they REALLY think that 5 psi is going to make a difference be my guest. I later put them back at 28.
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I happen to have had good experiences at Discount - on the other hand, my recent experience with selling a set of USED 32s to a person who took them to Discount or Wallmart and they would not mount them - too used they said. These "professional" tire people seem more interested in selling new tires and rims - no money to be made in mounting used tires on old rims! Sign of the economy if you ask me...anyway, mount them, run them, use them...ignore the sales pitch.
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I hate to say it.... But I told ya so Just kidding man... They look great! You will like it even better once the lift is on... You didnt have a problem with the rear tires hitting the pinch seam?
i work at discount tire and the only reason they want you to get a bigger rim is because the bead of the tire can litteraly blow off the tire from the rim and act as a mini bomb if you hit a bump hard. Ive worked on jeeps (and own one myself) where this has happened. as long as you dont put it to the max tire pressure ull be fine. but as for them filling up ur tire pressure. most of those guys don't know what the hell to fill up a tire lol. just make sure your not over/under inflating your tires cause ull screw up the tire itself. 23-30 is perfect for on road and 7-15 is perfect for on road.
They do it because of the liability. Tire manufacturers recommend 8.5" or more to mount a 12.5 tire. Imagine if a company did this without saying anything someone had a crash because a bead came off the wheel and then showed that to the courts. Bad news for said company. You are lucky that they let you sign a waiver. The discounts up in my area will refuse to do that work.
Its not to sell tires. I have seen way to many people put used tires on and then run them past the chords on the tire. As I said above its all liability and the company protecting itself. why would you want to risk something like that when the only thing touching the road on your Jeep are those tires.
Originally Posted by RockyClymer View Post
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