This is the Falken specs for the OE tires:
https://www.falkentire.com/oe-tires/wildpeak/t3wa
Model/Make | Item Number | Size | Load ID | Service Desc. | Approved Rim Width (in) | Measuring Rim (in) | Overall Diameter (in) | Overall Width (in) | Revolutions Per Mile | Tread Depth (/32in) | Tire Weight (lbs) | Max Load (lbs) | Max PSI (Cold) | U.T.Q.G. |
---|
2019+ RAM 1500 (4x4 Off-Road) | 59000080 | LT275/65R18 | C | 113/110S | 7.5 - 9.5 | 8.0 | 32.1 | 11.1 | 648 | 15.0 | 48.9 | 2535 | 50 | - |
2019+ RAM 1500 (4x4 Off-Road & North Edition, 3PMSF) | 59000570 | LT275/65R18 | C | 113/110S | 7.5 - 9.5 | 8.0 | 32.1 | 11.1 | 648 | 15.0 | 48.9 | 2535 | 50 | - |
2019+ RAM 1500 (4x4 Off-Road) | 59000090 | 275/55R20 | SL | 113T | 7.5 - 9.5 | 8.5 | 32.0 | 11.3 | 653 | 14.0 | 45.3 | 2535 | 51 | 500-B-B |
2019+ RAM 1500 (4x4 Off-Road & North Edition, 3PMSF) | 59000580 | 275/55R20 | SL | 113T | 7.5 - 9.5 | 8.5 | 32.0 | 11.3 | 653 | 14.0 | 45.3 | 2535 | 51 | 500-B-B |
These are their retail tire sizes in those wheel sizes:
Rim Diameter | Item Number | Tire Size | Load ID | Ply Rating | Service Desc. | Approved Rim Width (in) | Measuring Rim (in) | Overall Diameter (in) | Overall Width (in) | Revs Per Mile | Tread Depth (/32in) | Tire Weight (lbs) | Max Load Single / Dual (lbs) | Max Pressure (psi cold) | U.T.Q.G. |
18" | 28034901 | 275/65R18 | SL | 4 | 116T | 7.5 - 9.5 | 8.0 | 32.1 | 10.9 | 663 | 14 | 47.4 | 2756 | 51 | 660-A-B |
| 28030803 | LT275/65R18 | E | 10 | 123/120S | 7.5 - 9.0 | 8.0 | 32.1 | 10.7 | 651 | 18 | 60.2 | 3415 / 3085 | 80 | - |
| 28030703 | LT275/70R18 | E | 10 | 125/122S | 7.0 - 9.0 | 8.0 | 33.4 | 11.0 | 624 | 18 | 61.0 | 3640 / 3305 | 80 | - |
| 28030827 | LT285/65R18 | E | 10 | 125/122S | 8.0 - 10 | 8.5 | 32.6 | 11.3 | 642 | 18 | 64.2 | 3640 / 3305 | 80 | - |
| 28037333 | LT285/75R18 | E | 10 | 129/126R | 7.5 - 9.5 | 8.0 | 34.8 | 11.2 | 599 | 18 | 65.9 | 4080 / 3750 | 80 | - |
| 28037327 | LT295/70R18 | E | 10 | 129/126R | 7.5 - 10 | 8.5 | 34.3 | 11.6 | 609 | 18 | 68.1 | 4080 / 3750 | 80 | - |
| 28037122 | LT305/65R18 | E | 10 | 124/121R | 8.5 - 11.0 | 9.0 | 33.6 | 12.0 | 623 | 19 | 66.6 | 3525 / 3195 | 65 | - |
| 28030126 | LT325/65R18 | E | 10 | 127/124S | 9.0 - 12.0 | 9.5 | 34.6 | 13.0 | 605 | 20 | 76.7 | 3860 / 3525 | 65 | - |
| 28037330 | 37x12.50R18LT | E | 10 | 128R | 8.5 - 11 | 10.0 | 36.6 | 12.5 | 639 | 19 | 79.4 | 3970 | 65 | - |
20" | 28034021 | 275/55R20 | XL | 6 | 117T | 7.5 - 9.5 | 8.5 | 31.9 | 11.1 | 661 | 13 | 48.1 | 2833 | 50 | 660-A-B |
| 28034003 | 275/60R20 | SL | 4 | 115T | 7.5 - 9.5 | 8.0 | 33.1 | 10.8 | 640 | 13 | 47.8 | 2679 | 51 | 660-A-B |
| 28030128 | LT265/60R20 | E | 10 | 121/118S | 7.5 - 9.5 | 8.0 | 32.5 | 10.2 | 640 | 18 | 58.2 | 3195 / 2910 | 80 | - |
| 28030120 | LT275/65R20 | E | 10 | 126/123S | 7.5 - 9.5 | 8.0 | 34.1 | 10.6 | 611 | 18 | 66.1 | 3750 / 3415 | 80 | - |
| 28034121 | LT285/55R20 | E | 10 | 122/119T | 8.0 - 10 | 9.0 | 32.4 | 11.2 | 642 | 18 | 58.2 | 3305 / 3000 | 80 | - |
| 28037329 | LT285/60R20 | E | 10 | 125/122R | 8.0 - 10 | 8.5 | 33.5 | 11.2 | 622 | 18 | 65.5 | 3640 / 3305 | 80 | - |
| 28037326 | LT285/65R20 | E | 10 | 127/124R | 8.0 - 10 | 8.5 | 34.6 | 11.2 | 603 | 18 | 67.7 | 3860 / 3525 | 80 | - |
| 28037328 | LT295/60R20 | E | 10 | 126/123R | 8.0 - 10 | 8.5 | 33.9 | 11.6 | 614 | 18 | 69.4 | 3750 / 3415 | 80 | - |
| 28030952 | LT305/55R20 | E | 10 | 121/118S | 8.5 - 11.0 | 9.5 | 33.2 | 12.3 | 626 | 19 | 71.0 | 3195 / 2910 | 65 | - |
| 28030125 | LT325/60R20 | E | 10 | 126/123S | 9.0 - 12.0 | 9.5 | 35.4 | 12.8 | 591 | 20 | 83.8 | 3750 / 3415 | 65 | - |
| 28037118 | 35x12.50R20LT | E | 10 | 121R | 8.5 - 11.0 | 10.0 | 34.6 | 12.5 | 603 | 20 | 76.1 | 3195 | 65 | - |
| 28037331 | 37x12.50R20LT | E | 10 | 126R | 8.5 - 11.0 | 10.0 | 36.5 | 12.5 | 570 | 19 | 77.8 | 3750 | 65 | |
Note, the 275/55-20 is the only non-LT Load Range E size in their regular tire.
They are not the same tire, retail on the left, OE on the right.