Product Description:
2258-1R – 2016-2024 Camaro Coilover Kit, Rear, Viking Shocks, Race-Handling
Maximum rear-end control for serious track and autocross builds. Features UMI double-shear mounts, Viking Crusader race valving, and 550 lb/in springs.
- Race-focused spring rates utilizing 550 lb/in coils for high-grip tires
- Viking Crusader valving for aggressive autocross and road course duty
- Independent compression & rebound to dial in corner weights and squat
- Double-shear upper mounts provide a rigid, flex-free chassis foundation
Quick Overview
Fitment: 2016-2024 Chevrolet Camaro
Primary benefit: Uncompromised rear suspension support and adjustability for high-level competition and track day performance.
Spring Rate: 550 lb/in
Shock Valving: Viking Crusader
Adjustment: Double Adjustable
Install Type: Bolt-On
Description
UMI’s 2258-1R Rear Coilover Kit is the ultimate race-focused solution for 6th Gen Camaro owners demanding maximum rear-end control, consistency, and track tuning capability. Designed for serious road race, time-trial, and national-level autocross builds, this package eliminates the factory divorced spring setup. By pairing stiff 550 lb/in springs with Viking Crusader double adjustable shocks, it delivers the robust platform support required for running high-grip tires, aerodynamic upgrades, and aggressive track alignments.
Built for 2016–2024 Camaro models, the 2258-1R system integrates seamlessly into the chassis using UMI’s extreme-duty double-shear upper mounts. The coilover design provides precise ride-height and corner-weight adjustments to optimize cross-weight and rake. With its direct bolt-on installation using factory lower control arm points and zero welding required, this USA-engineered kit allows you to quickly dial in compression and rebound to master any track surface.
Product Features
- UMI 2258 double-shear upper mount brackets
- Viking A392GP Crusader double adjustable shocks
- Eye-to-eye shock configuration with bearing mounts
- 2.55" I.D. × 12" tall 550 lb/in race springs
- Full ride-height and corner-weight adjustability
- Broad 13.47–20.22 inch travel/length range
- 100% bolt-on with no chassis cutting required
⚠ Fitment Note: A MagneRide delete module is required when using Viking, Penske, or other aftermarket shocks when installed on vehicles equipped with factory MagneRide struts. This module bypasses the MagneRide system and eliminates error codes on the dash.
Detailed Features
- Viking Crusader double adjustable shocks: Features race-oriented valving to provide independent tuning of compression and rebound for high-speed track stability.
- 550 lb/in coilover springs: The 12-inch tall, high-rate springs provide the aggressive support needed for high-grip racing compounds and aero-equipped cars.
- Double-shear shock mounts: UMI's laser-cut brackets replace the weak factory single-shear setup, eliminating flex and improving suspension responsiveness.
- Coilover height adjustment: Threaded shock bodies allow precise spring preload and ride-height changes, enabling perfect corner-balancing for competition.
- Bearing mount shock ends: Enhances pivot articulation and prevents binding under extreme suspension travel during road racing and autocross.
- Direct bolt-on installation: Attaches securely to factory chassis locations and OEM or aftermarket lower control arms using supplied premium hardware.
Product Outcomes
- Delivers the ultra-stiff rear platform support needed for sticky R-compound tires.
- Maximizes corner-exit grip by allowing independent tuning of rear squat and body roll.
- Enables precise corner-balancing for a perfectly neutral, competition-ready chassis.
- Withstands national-level autocross and time-trial abuse without component deflection.
Installation Summary
Overview & Difficulty: Moderate DIY install requiring floor jacks, jack stands, and hand tools; 2–4 hours. Disassemble the rear suspension by removing wheels, fender liners, factory shocks, and coil springs. Bolt the UMI 2258 upper brackets into place (torque M10 nuts to 30-35 ft/lbs). Assemble the Viking coilovers (body/adjusters facing UP) with the 12-inch springs. Install the bearing mount spacers per Viking instructions. Mount the top of the shock using the 1/2-inch bolt and spacer (torque to 70 ft/lbs), and secure the lower factory bolt. Magneride vehicles must disconnect the suspension harness.
What’s Included:
- UMI 2258 driver and passenger upper mount brackets
- Viking A392GP Crusader double adjustable rear shocks ×2
- Viking 12DP550 2.55" I.D. × 12" 550 lb/in springs ×2
- Complete Grade 8 upper mounting hardware and spacers
Is This Product Right for You?
The UMI 2258-1R race kit is uncompromising by design. Built specifically for the rigors of track days, time trials, and autocross competition, the 550 lb/in spring rate and Crusader valving offer the ultimate in chassis tuning. This kit requires drivers to accept a firmer, track-biased ride in exchange for absolute stability and grip at the limit.
Best For
- National-level autocrossers and time-trial competitors.
- Camaro builders running R-compound tires and aggressive aerodynamics.
- Drivers needing precise corner-weight capabilities and extreme damper tuning.
Not Ideal For
- Daily drivers prioritizing a soft, comfortable commute (choose 2258-1S).
- Stock-tire street cars that won't benefit from high-rate track springs.
Product FAQ
Quick answers
Who is the UMI 2258-1R race kit intended for?
The 2258-1R kit is aimed at 2016–2024 Camaro owners focused on road race, time-trial, and high-level autocross performance, where rear suspension support and adjustability are critical.
What makes the 2258-1R a “race” kit?
The 1R uses Viking Crusader shocks with a race-oriented valving range and 550 lb/in rear springs, providing the support and control needed for high-grip tires and aggressive driving.
Can I still drive on the street with the 2258-1R kit?
You can, but the 550 lb/in springs and race-focused valving will ride significantly firmer than a street-biased setup. This kit is optimized for track performance.
What advantages do Crusader shocks provide in the rear?
Crusader double adjustable shocks allow independent tuning of compression and rebound, letting you control squat under power, turn-in rotation, and overall platform stability.
Does the 2258-1R kit allow corner-weight adjustment?
Yes. The coilover design lets you adjust spring preload and ride height, enabling precise stance, rake, and corner-balance settings for competition.
Is any welding required to install the race kit?
No. The UMI brackets and Viking coilovers are designed as bolt-on components that install using factory mounting points and the supplied hardware.
What shock end style does the 1R kit use?
The Viking A392GP shocks feature bearing mount ends for improved articulation and zero binding during extreme suspension travel.
Should I pair this rear kit with other suspension parts?
For best results, UMI recommends pairing the 2258-1R rear kit with front coilovers, caster/camber plates, sway bars, and performance rear links to build a balanced, race-winning chassis.
