2020 Dodge Ram 1500 Big Horn Leveling Kit & Tire Fitment Advice
I have a 2020 Ram 1500 Big Horn and I want a clean, aggressive stance upgrade without rubbing. I’m planning to add a leveling kit, wheel spacers, and run 305/55R20 tires on the stock 20” wheels. What’s the largest tire size I can realistically run with a level and still avoid rubbing? Should I go with a 2” or 2.5” leveling kit, and what brands are recommended for reliability and ride quality? For the stock 20s, what spacer size is typically best to avoid upper control arm (UCA) rub while still getting a good stance? I’m looking for the best setup to do it right the first time.
For your 2020 Ram 1500 Big Horn, aiming for a clean aggressive stance with 305/55R20 tires on stock 20" wheels, the best approach is a 2.5" front leveling kit paired with 20mm wheel spacers. This combo maximizes clearance and stance without causing rubbing on the upper control arms or fenders.
Top recommendations
-
ReadyLIFT 2.5" Leveling Kit
Reliable, proven kit with quality strut spacers and hardware. It lifts the front enough to clear 305/55R20 tires without over-lifting, keeping ride quality solid. Cost: ~$250-$300. Install: Moderate (DIY with tools, but pro recommended for alignment). -
MotoDyn 20mm Wheel Spacers
20mm spacers on stock 20" wheels widen track for aggressive stance but stay short enough to avoid UCA or fender liner rub. Cost: ~$100-$150. Install: DIY-friendly with proper torque tools. -
Nitto Terra Grappler G2 305/55R20 Tires
Popular all-terrain tire that fits well with a 2.5" level, offering a good balance of off-road capability and street manners. Cost: ~$250-$300 per tire. Install: Shop install recommended.
Compatibility & prerequisites
- Confirm your Ram 1500 is the 5th gen (2019+), 4x4 or 4x2 affects suspension geometry slightly but this setup works for both.
- Stock 20" wheels with factory offset (around +20mm) are compatible with 20mm spacers; check bolt pattern (likely 5x139.7).
- A 2.5" leveling kit is better than 2" for 305/55R20 tires clearance; 2" may cause slight rubbing under full compression or turning.
- Wheel spacers require proper hub-centric design and torque specs to avoid vibration or bearing issues.
- Alignment is mandatory after leveling kit install to avoid uneven tire wear and maintain handling.
- No ECU tuning or other suspension mods needed for this mild lift and tire size.
Realistic expectations & tradeoffs
- Expect about 1.5-2" of actual front lift after settling with a 2.5" kit.
- 305/55R20 tires are roughly 33" tall, about 1.5" taller than stock 275/60R20, so speedometer recalibration may be needed for accuracy.
- Ride quality should remain close to stock with a quality leveling kit; avoid cheap spacers that can cause harshness.
- Wheel spacers add leverage on wheel bearings; 20mm is moderate but check torque regularly.
- No major impact on fuel economy but expect slight drop due to larger tires.
- Avoid going larger than 305/55R20 without additional suspension mods (longer UCAs, fender trimming) to prevent rubbing.
A few questions
- Are you running stock suspension components or have you upgraded shocks/UCAs?
- Is your Ram 1500 4x4 or 4x2?
- Do you plan to use the truck for towing or heavy payload often?
- What’s your budget range for suspension and tire upgrades?
- How important is maintaining factory ride comfort vs aggressive stance?
If you want, I can help with part links and detailed install tips.