The Dodge Charger RT is a powerful machine that marries everyday practicality with V8 muscle. However, its hefty curb weight and front-heavy bias mean the factory suspension prioritizes comfort over razor-sharp handling. To unlock the platform’s true potential—whether for aggressive canyon carving, track days, or simply a more planted highway ride—targeted upgrades to the suspension, chassis, and contact patch are essential. This guide dives deep into the three most impactful categories: coilover systems, subframe braces, and high-performance tires.

Coilovers: Tuning Ride Height and Damping

Coilovers replace the factory strut-and-spring assembly with a single adjustable unit, giving you control over both ride height and damping characteristics. For the Charger RT, this is the single most effective way to lower the center of gravity, reduce body roll, and eliminate the floatiness that plagues the stock setup. The key is selecting a system matched to your driving style.

Adjustability Levels: Street vs. Track Focus

Coilovers come in several tiers. Entry-level units offer threaded spring perches for ride height adjustment only. Mid-range systems add adjustable damping (rebound and compression), usually via a knob on the top of the damper. Premium setups allow independent control of low- and high-speed compression, letting you fine-tune response over bumps versus aggressive cornering. For a daily-driven Charger RT, a 30-click adjustable damper provides enough range to stiffen for weekend track time without punishing you during the commute.

Spring Rates and Weight Distribution

The Charger RT’s heavy Hemi engine (roughly 58% front weight bias) demands stiffer spring rates at the front to manage dive under braking and weight transfer during cornering. Typical aftermarket setups rate front springs from 10–14 kg/mm and rear springs 8–12 kg/mm. Too soft and the car will plow. Too stiff and traction over bumpy pavement suffers. Reputable manufacturers like BC Racing (with their ER series) and KW Suspensions (Variants 1-3) offer valving tuned specifically for the LD platform. BC Racing provides spring rate customization at purchase, allowing owners to dial in the balance.

Installation Realities

Installing coilovers on a Charger RT is a weekend job with basic tools. Expect to remove the front strut assembly (requires spring compressors for OEM parts) and the rear springs, which are separate from the damper. A key step often skipped: preload the springs and set corner weights on a scale for maximum performance. Even without corner balancing, dropping the car 1.25 inches (a typical low setting) transforms turn-in response.

Popular brands to research:

  • BC Racing BR/ER: Best value for price; 30-click damping adjustment and stainless steel bodies. BC Racing official site
  • KW V2/V3: Excellent quality and corrosion protection; V3 offers separate rebound/compression. KW Suspensions
  • Eibach Pro-Street S: Tuned for street comfort with progressive springs; limited height adjustment.

Subframe Braces: Stiffening the Chassis

The Charger RT’s unibody chassis is surprisingly flexible under heavy loads—engine torque twists the front subframe, and the rear cradle moves independently, causing wheel hop and imprecise geometry during hard launches or high-speed corners. Subframe braces bolt directly into existing mounting holes and tie the subframe to the body, drastically reducing compliance.

Front Subframe Braces

The most obvious upgrade is a front strut tower bar, which ties the top of the strut mounts together. On the Charger RT, the factory strut towers are far apart, so a properly triangulated bar reduces cowl shake and sharpens steering response. Beyond that, a lower subframe brace (often called a “K-member brace” or “radiator support brace”) connects the lower control arm mounts. BMR Suspension offers a front subframe brace (part SPB016) that virtually eliminates spring bind and keeps the control arms properly aligned under lateral load. BMR Suspension product line

Rear Subframe Cradle Braces

Wheel hop is the enemy of both traction and driveline health. The rear cradle—holding the differential and lower control arms—flexes upward under torque, unloading the tires. Rear subframe inserts or full cradle braces (e.g., Steeda’s subframe alignment kit) lock the cradle into the body. This stiffens the rear, reduces wheel hop, and improves tire compliance over bumps. Steeda’s brace uses billet aluminum inserts that integrate with the factory mounting locations. Steeda subframe braces (note: also check Steeda’s Dodge-specific parts).

Mid-Chassis Braces

For those seeking maximum rigidity, a set of subframe connectors (SFCs) ties the front and rear subframes together underneath the floorpan. While the Charger has a decent central tunnel, full-length SFCs with welded or bolt-in design reduce side-to-side flex. Brands like Hotchkis provide boxed, TIG-welded SFCs that tuck close to the floor, maintaining ground clearance.

Tire Recommendations: The Ultimate Contact Patch

All the suspension stiffness in the world is wasted if the tires can’t put power down. The Charger RT’s heavy frame and high torque require tires with robust sidewalls and advanced rubber compounds. The stock 245/45R20 all-seasons are inadequate for performance driving. Consider stepping up in width—to 275/40R20 on the rear (and optionally 275 front)—for better grip and reduced understeer. Ensure the wheel width supports the tire (9.5-inch width for 275s).

Summer Performance Tires

For enthusiasts who drive aggressively in dry and marine conditions, a max-performance summer tire is the gold standard:

  • Michelin Pilot Sport 4S: The benchmark. Outstanding wet and dry grip, progressive breakaway, and long tread life for the category. Ideal for a Charger RT that sees street and track time.
  • Continental ExtremeContact Sport 02: Very close to the Michelin in performance, usually at a lower price point. Slightly softer sidewall, providing a comfortable ride while still delivering high lateral grip.
  • Goodyear Eagle F1 Asymmetric 3: Superior resistance to hydroplaning. Sharp turn-in and excellent steering feel. A solid choice for wetter climates.

All-Season High-Performance Options

If you deal with occasional snow or cold temperatures, a UHP all-season offers a compromise:

  • Michelin Pilot Sport All Season 4: Exceptional dry grip for an all-season, with good snow traction.
  • Continental DWS 06 Plus: Balanced performance and comfort. The “DWS” stands for Dry, Wet, Snow—verified by treadwear indicators.
  • General G-Max AS-07: Budget-friendly with impressive cornering stability.

For specific sizing, check Tire Rack for user reviews on Charger RT fitments. Many owners find 275/40R20 all around (with 9-10-inch wheels) dramatically reduces understeer.

Tire Pressure and Alignment Tuning

After upgrading tires, adjust pressures lower for track work (32 psi hot front, 29 psi hot rear) and ensure alignment specs are optimized. With coilovers, you can dial in front negative camber (-1.5 to -2.0 degrees) to maximize front grip without excessive tire wear. A reputable alignment shop can set thrust angle and toe to factory specs (or a touch of toe-in for stability).

“Upgrading to 275 Michelin PS4S and a set of BC coilovers turned my Charger RT from a nose-heavy cruiser into a predictable, confident corner carver. The subframe braces eliminated the wheel hop that used to shake the whole car.” — Charger forum owner review

Additional Considerations: Sway Bars and Brakes

To complement coilovers and braces, a sway bar upgrade (e.g., Hotchkis or Addco) reduces body roll further. Use a larger front bar (32-35mm) to balance with a stiffer rear bar (20-25mm). Also, with greater tire grip, the stock brakes may fade. Consider high-performance pads (e.g., Hawk HP+) and braided lines to handle repeated hard stops. These upgrades form a cohesive system that transforms the Charger RT’s behavior.

Conclusion: Build a Cohesive System

The Dodge Charger RT responds brilliantly to targeted handling upgrades. Start with coilovers to control ride height and damping, add subframe braces to tighten the chassis, then lay down high-performance tires to capitalize on the newfound rigidity. Each part works best when combined: a strong chassis helps the coilovers work effectively, and good tires let you use the extra cornering potential. The result is a Charger that drives smaller than its size, inspires confidence on twisty roads, and retains everyday usability. Invest in quality components, align the car properly, and enjoy the transformation.