📋 2020 Ram 1500 Quick Specs
The 2020 Ram 1500 ships from the factory in multiple tire sizes depending on trim and wheel package. Always check the door-jamb tire-and-loading sticker for the exact size, load index, speed rating, and inflation pressure that came on your specific vehicle.
🏭 OEM Tire Sizes by Trim
| Trim / Package | Tire Size | Load Idx | Speed | Cold PSI |
|---|
| Tradesman / HFE (18") | 265/70R18 | 116 | T | 35 psi |
| Big Horn / Laramie (20") | 275/65R20 | 116 | T | 35 psi |
| Laramie Longhorn / Limited (22") | 285/45R22 | 114 | H | 35 psi |
| Rebel (18") | LT285/70R17 or 275/70R18 | 117/116 | T | 35 psi |
💡 Reading the sizeExample: 275/65R18 116T. 275 = width in mm. 65 = sidewall as % of width. R18 = 18 inch wheel. 116 = load index (2756 lb per tire). T = speed rating (118 mph max).
🔁 Alternate Sizes That Fit
These sizes maintain stock revs-per-mile within roughly 3% (the threshold where speedometer, ABS, and traction control stay accurate). Always verify load index meets or exceeds OEM.
- 265/70R18
- 275/65R20
- 275/55R20
- LT285/70R17
- 285/45R22
📈 Plus-Sizing Options
Plus sizing increases wheel diameter while keeping overall tire diameter the same. This preserves your speedometer accuracy and gearing but allows wider tread and a more aggressive look.
- Plus 1: 285/55R20 from 275/65R20 - virtually identical OD
- Plus 2: 33x12.50R20 (~305/55R20) requires fender trim
⚠ Watch the load indexIf you go below OEM load index, especially on trucks and SUVs, you risk a sidewall failure under load. Never drop more than 1–2 load index points from stock.
🔩 Wheel Specifications
| Bolt Pattern | 6x139.7mm |
| Offset | +18mm to +25mm |
| Center Bore | 77.8mm |
| Common Widths | 8.0J–9.0J |
Hub-centric rings are required if your aftermarket wheel has a larger center bore than 77.8mm. Lug-centric mounting causes vibration and uneven wear.
❓ Frequently Asked Questions
What is the stock tire size on a 2020 Ram 1500?
The factory tire size on a 2020 Ram 1500 varies by trim. Base trims use 265/70R18, while higher trims may run up to LT285/70R17 or 275/70R18. Check your door-jamb sticker for the exact size on your vehicle.
Can I put bigger tires on my 2020 Ram 1500 without a lift?
Yes, within reason. Most 2020 Ram 1500 trims accept one size larger without rubbing, especially if you stick close to stock overall diameter. Plus 1: 285/55R20 from 275/65R20 - virtually identical OD
What is the bolt pattern on a 2020 Ram 1500?
6x139.7mm. This determines what aftermarket wheels physically bolt up. Center bore is 77.8mm, which matters for centering the wheel on the hub.
What tire pressure should I run in my 2020 Ram 1500?
The recommended cold inflation pressure is on the door-jamb sticker, usually 35 psi for most trims of the 2020 Ram 1500. Check pressures cold (before driving) once a month.
Do I need to match speed rating exactly?
You should at minimum match the speed rating your manufacturer specified. Going to a lower speed rating can void some tire warranties and is not recommended for highway driving, especially on heavier vehicles.
Can I run all-terrain tires on a 2020 Ram 1500?
Yes. Many 2020 Ram 1500 owners run all-terrains in OEM or one-size-up dimensions. Just confirm the load index meets the door-jamb spec and add a few psi if you go to LT-rated tires from P-metric.
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