Ram 1500 Bolt Pattern, Wheel & Tire Sizes
TL;DR
Older Ram 1500s (2009-2018 / Classic) run 5 lugs at 5x139.7 mm; the 2019+ DT-generation truck runs 6 lugs at 6x139.7 mm. Center bore is 77.8 mm on both, stud thread is M14x1.5 on both.
Ram 1500 bolt pattern by generation
The Ram 1500 changed its lug pattern when the truck was redesigned for the 2019 model year, so the number that applies to your truck depends heavily on which generation you own.
- 4th generation (2009-2018) and Ram 1500 Classic (2019-2024, the carryover work-truck version sold alongside the new DT): 5x139.7 mm (5x5.5 in) bolt pattern, 5 lug studs.
- 5th generation / DT (2019-present): 6x139.7 mm bolt pattern, 6 lug studs - a notable change from the previous generation.
Multiple independent wheel-fitment references (SD Wheel, 2N Forged, Bolt Pattern HQ, The Driver Adviser and others) agree on 77.8 mm center bore and an M14x1.5 stud thread for both generations, with a commonly cited factory lug torque near 130 lb-ft. Always confirm torque with your own owner's manual, since torque specs can vary slightly by wheel material and trim.
Stock wheel and tire sizes
Wheel size grows with trim level on both generations, generally ranging from 17 in on base work-truck trims up to 20-22 in on higher trims, plus the TRX's distinct 18-in performance wheel.
Where to double-check for YOUR truck
Because trim packages, regional variants and options change these figures, always verify against your own vehicle before ordering wheels or tires:
- The driver's door jamb placard (tire size, wheel size, and cold inflation pressure).
- The owner's manual section on wheels and tires.
- The markings stamped into your current wheel and tire sidewall.
| Generation / years | Bolt pattern | Centre bore | Stud thread | Stock wheel sizes | Common tire sizes |
|---|---|---|---|---|---|
| 4th gen (2009-2018) | 5x139.7 mm (5x5.5 in) | 77.8 mm | M14x1.5 | 17-20 in depending on trim | 265/70R17, 275/60R20 (varies by trim) |
| Ram 1500 Classic (2019-2024, carryover) | 5x139.7 mm (5x5.5 in) | 77.8 mm | M14x1.5 | 17-20 in depending on trim | 265/70R17, 275/60R20 (varies by trim) |
| 5th gen / DT, Tradesman-Big Horn (2019-present) | 6x139.7 mm | 77.8 mm | M14x1.5 | 17-18 in | 265/70R17, 275/65R18 |
| 5th gen / DT, Laramie-Limited (2019-present) | 6x139.7 mm | 77.8 mm | M14x1.5 | 18-20 in | 275/65R18, 275/60R20 |
| 5th gen / DT, Rebel (2019-present) | 6x139.7 mm | 77.8 mm | M14x1.5 | 18 in | LT275/70R18 (approx. 33 in) |
| 5th gen / DT, TRX (2021-2024) | 6x139.7 mm | 77.8 mm | M14x1.5 | 18x9 in, +19 mm offset (factory) | LT325/65R18 (approx. 35 in) |
Why some sources disagree slightly
You may see the 4th-gen bolt pattern written as 5x5.5 inches on some sites and 5x139.7 mm on others - these are the same measurement expressed in different units, not a discrepancy. Where trim-level wheel and tire pairings varied by regional package or model year running change, we have shown the most commonly cited factory combination; your build sheet or door placard is the final word.
Summary
| 4th gen (2009-2018) bolt pattern | 5x139.7 mm (5x5.5 in) |
|---|---|
| Ram 1500 Classic (2019-2024) bolt pattern | 5x139.7 mm (5x5.5 in) |
| 5th gen / DT (2019-present) bolt pattern | 6x139.7 mm |
| Center bore (both generations) | 77.8 mm |
| Stud thread (both generations) | M14x1.5 |
| TRX factory wheel/tire | 18x9 in +19mm / 325/65R18 |
| Typical wheel size range | 17-22 in depending on trim |
Full diagnostics
For the complete step-by-step diagnostic and repair guide, see Ram 1500: Common Problems, Fault Codes & Repairs.
Frequently asked questions
Did the Ram 1500 bolt pattern change between generations?
Yes. The 2009-2018 4th-generation Ram 1500 (and the Ram 1500 Classic sold through 2024 as a value-priced carryover) uses a 5x139.7 mm (5-lug) bolt pattern. The redesigned 5th-generation DT truck, sold from 2019 onward, switched to a 6x139.7 mm (6-lug) bolt pattern. Wheels are not interchangeable between the two families.
What is the center bore on a Ram 1500?
Independent wheel-fitment references consistently list a 77.8 mm center bore across both the 5-lug 4th-generation trucks and the 6-lug 5th-generation DT trucks. Aftermarket wheels with a larger bore will need hub-centric rings to seat properly.
What size are the factory wheels on a Ram 1500 TRX?
The TRX performance trim (model years 2021-2024) comes from the factory with 18x9 inch wheels at a +19 mm offset, wrapped in 325/65R18 all-terrain tires that measure roughly 35 inches tall.
Where can I find the exact tire size for my specific Ram 1500?
Check the placard on the driver's door jamb, which lists the exact OEM tire size and recommended cold tire pressure for your specific build, or read the size directly off your current tire's sidewall. Trim, cab configuration and model-year running changes all affect the factory size, so the placard is more reliable than any general chart.