Stock Tires

[CWtheMan]

Originally Posted by solv3nt

The Karrier tires have a rating of 2200# per tire at 75psi. The Goodyear Endurance tires have a rating of 2039#, which is less than the GVWR and does not meet the RVII or whatever.
Karrier: Load index 108
Goodyear: Load index 105

There is a bottom line here. If the Karrier has been properly documented as OEM for your trailer, you cannot use the GY LRD as a replacement. Officially the GY does not have the load capacity to replace an OEM tire with more load capacity than the GY can provide.

[CWtheMan]

Originally Posted by bsmith0404

You keep saying the double standard of load range and load index exists only in trailer tires. My truck tires are load range E load index 125. Load index 125 is 3638 lbs which matches the max load of 3640 marked on the side of the tire, Isn’t that a double standard as well? YES! Automotive tires have their inflation pressures set in accordance with a well established load capacity reserve factor. Trailer tires do not have that standard as they can be set at maximum inflation pressures to accommodate GAWR requirements. The purpose of the load index cannot be solely to have a place to put the speed rating. If that was the case, why would the industry assign weights to different load indexes? Btw, my spare is a load range E load index 124 and max load of 3525 which also matches up with load index 124

It's a 2# difference. In the eyes of a NHTSA tire rules committee it is a double standard.

The LT235/85R16 LRD (LI 120) provides 3086# at load index 120 and 3042# at LRE.

Tire rules can be very specific. Lets say the trailer manufacturer uses ST235/80R16 LR tires rated at 3420# on a 6840E vehicle certified axle but the load index is 123 = 3417#. According to the load index the tires are 3# short of minimum. That will automatically put that vehicle into a recall action.

[solv3nt]

Discount tire replaced my tires with the 215/75r14 and provided the metal stems.