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Community Alumni
Oct 10, 2017

Matching Tire and Wheel Capacities (follow up)

The short of my question... Can I have a tire/wheel combination where the load capacity of the tire exceeds the load capacity of the wheel?

Now the long version... I currently have the usual 14x5.5 steel wheels stamped for 1870 lbs. My current tires are ST205/75R14, Load Range C, 1760 lbs, 50 psi, 65 mph. The weight of my trailer is well within these capacities. I'm not worried about that at all. Nevertheless, the tires are old and wearing thin. I'm interested in upgrading to Load Range D. Load Range D specs are more like 2100 lbs, 65 psi and 80 mph. What really interests me is the higher speed rating. Not that I plan to go 80 mph, but I like that margin of error. That is, I'd rather go 60-65 mph on 80 mph tires versus going 60-65 mph on 65 mph tires. That's my motivation. So then... Can I put the Load Range D tires on my old wheels? I though I once read something about not exceeding the psi rating of the wheel (which in turn dictates the tire selection), but I see no psi information on the wheel.

Thanks!

24 Replies

  • It is my understanding the wheels fail due to overload, not overinflation. Since the wheels will be carrying the same load, there isn't a problem with using tires that uses more inflation pressure.
  • The load range D tire is capable of handling increased pressure, but you are not required to inflate it to that pressure. Install the LR D tires and inflate them to the same 50 psi. The load capacity will be the same as the LR C at 50 psi.
  • mike-s wrote:
    A ST205/75R14, LRD is rated for 1855@55, which closely matches your wheels.


    My understanding is an ST205/75 R14 LR D tire would require a cold inflation of 65 p.s.i., not 55 p.s.i. Indeed, the new Goodyear Endurance in this size is a LR D tire rated for 2040 lbs @ 65 p.s.i.
  • Range, not rang.

    You can put a higher capacity tire on a wheel, but the combined rating is the lesser of the two.

    A ST205/75R14, LRD is rated for 1855@55, which closely matches your wheels.