2020 Ram 1500 Classic Quad Cab Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 2020 Ram 1500 Classic Quad Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 6x139.7 (6x5.5") |
|---|---|
| Lug Nut / Bolt Size | 14x1.5 |
| Center Bore (CB) | 77.8 mm |
| Offset (ET) | 19 |
| Torque Specs | 100 ft-lbs (135 Nm) |
Imperial Match: 6x139.7 is commonly referred to as 6x5.5" in US Standard.
2020 1500 Classic Quad Cab — Year-Specific Fitment Context
The 2020 Ram 1500 Classic Quad Cab is in year 2 of 5 using the 6x139.7 pattern (2019–2023). Wheels from any 2019–2023 Ram 1500 Classic Quad Cab are cross-compatible with the 2020 model.
Ram 1500 Classic Quad Cab Bolt Pattern by Year
The table below shows how the 1500 Classic Quad Cab's wheel specifications have changed over the years. The 2020 model year is highlighted.
6x139.7 Pattern Context
This bolt pattern appears on 1067 vehicles in our current database and is considered common.
Examples of other vehicles using 6x139.7:
Expert Buying Guide for 2020 Ram 1500 Classic Quad Cab
For your 2020 Ram 1500 Classic Quad Cab, the 77.8mm center bore is critical. Aftermarket wheels often have a larger bore (e.g., 78.1mm or 106.1mm), requiring hub-centric rings to prevent vibration and ensure load is on the hub, not the lug nuts. The 19mm offset is sensitive; staying within ±5mm avoids rubbing or suspension interference. Always use 14x1.5 lug nuts with the correct seat (cone or ball) matching your wheel. Mismatched seats cause loose wheels and accidents. Verify bolt pattern 6x139.7 and torque to 130-140 ft-lbs.
Historical Fitment Data Reference
In our dataset, Ram 1500 Classic Quad Cab appears from 2019 to 2023 (5 model years). Across recorded model years, this model generally keeps the same bolt pattern.
- Observed bolt-pattern variants for this model: 1
- Observed center-bore variants for this model: 1
- Observed lug-size variants for this model: 1
- Observed total offset span across years: 0.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts after 50-100 miles of driving to account for settling.
- ✅ Avoid wheels with offset below 14mm or above 24mm to prevent rubbing or clearance issues.
- ✅ Use only 14x1.5 lug nuts; 1/2-20 or M14x1.25 will not fit and can damage threads.
- ⚠️ Torque lugs in a star pattern to 100 ft-lbs (135 Nm), then re-check torque after 50-100 km (30-60 miles).
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2020 Ram 1500 Classic Quad Cab — Frequently Asked Questions
What is the bolt pattern for a 2020 Ram 1500 Classic Quad Cab?
The 2020 Ram 1500 Classic Quad Cab uses a 6x139.7 bolt pattern (also called lug pattern or PCD). The center bore is 77.8mm and the offset is 19mm.
What other years of Ram 1500 Classic Quad Cab have the same bolt pattern as the 2020?
The Ram 1500 Classic Quad Cab uses the 6x139.7 pattern from 2019 through 2023. Wheels from any of these model years are dimensionally compatible with the 2020, provided the offset and center bore also match.
What lug nut size does the 2020 Ram 1500 Classic Quad Cab use?
The 2020 Ram 1500 Classic Quad Cab uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
What is the PCD for a 2020 Ram 1500 Classic Quad Cab?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 2020 1500 Classic Quad Cab, the PCD is 6x139.7.
How tight should I torque the lug nuts on a 2020 Ram 1500 Classic Quad Cab?
Refer to your owner's manual for exact specs, but always tighten the 14x1.5 hardware in a star or crisscross pattern. Re-torque after the first 50 miles of driving.
Can I put aftermarket wheels on my 2020 Ram 1500 Classic Quad Cab?
Absolutely. Just ensure the aftermarket wheels have a 6x139.7 bolt pattern, an offset near 19mm, and a center bore of at least 77.8mm (using hub rings if larger).
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