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Headquartered in Spring Green, Wisconsin, Ringbrothers is a premier custom automotive manufacturer and high-performance parts supplier. Co-founded by brothers Jim and Mike Ring, the brand is globally recognized as the "King of Modern Muscle Cars". Ringbrothers specializes in creating "restomods"—vehicles that seamlessly blend classic aesthetics with cutting-edge modern performance. Their core operations encompass full vehicle custom fabrication, CNC precision machining of billet aluminum components, and advanced carbon fiber composite manufacturing. Renowned for treating every vehicle as a piece of automotive art, Ringbrothers is a perennial highlight of the SEMA Show and a frequent winner of international automotive design awards.
1. The Foundations (1980s–2004)
The Ringbrothers' passion for automotive craftsmanship began in childhood. By ages 10 and 11, Jim and Mike were already gaining hands-on experience in bodywork and painting, utilizing their parents' basement and friends' abandoned chicken coops as makeshift workshops. In their youth, Jim established a local body repair shop in Spring Green, eventually bringing Mike into the business to launch their joint career in automotive restoration.
2. Establishment & Expansion (2004–2010s)
The brand's legal entity was officially established in 2004. Early business mainly includes community collision repair and parts sales. Around the early 2010s, Ringbrothers began manufacturing aluminum parts. In 2014, Ringbrothers was officially registered, and that same year won General Motors' "Best in Show Chevrolet Award" with exceptional modified works.
3. Global Dominance (Mid-2010s–Present)
The brand accumulated a large amount of international reputation through stunning debuts at the SEMA Show. In recent years, Ringbrothers further expanded its business, newly built factories and warehouse facilities, and continuously enriched its global parts sales business. From 2025 to 2026, the brand reached a new peak of achievement: unveiled the unprecedented all-carbon-fiber Aston Martin DBS "Octavia" at Monterey Car Week, and launched Kingpin Mustang at SEMA 2025, with annual operating revenue hitting new highs.
Ringbrothers operates two distinct but synergistic business sectors: Bespoke Vehicle Customization and High-Performance Aftermarket Accessories.
Each build is a unique, client-commissioned masterpiece, typically unveiled at major automotive events.
Kingpin (1969 Ford Mustang Mach 1): Debuted at the 2025 SEMA Show, heavily modified based on the Roadster Shop Fast Track Stage III chassis, the front body width extended by 2 inches, the rear by 3.5 inches, the wheelbase extended forward by 1.5 inches. Equipped with Wegner Motorsports 5.0-liter Coyote V8 engine and Whipple supercharger, outputting 800 horsepower, matched with a 6-speed manual transmission. The construction of each Kingpin takes more than 5,500 hours, featuring extensive CAD design and hand-polished carbon fiber panels.
Octavia (1971 Aston Martin DBS): The brand's most ambitious and highly acclaimed work to date, debuted at Monterey Car Week and SEMA 2025. Redefining the body structure, the entire vehicle was modified from a steel chassis to an all-carbon fiber body, using CAD for 3,900 hours, handmade for 8,200 hours. The chassis and subframe were replaced with the new Roadster Shop Fast Track Stage III platform, equipped with Wegner Motorsports Ford 5.0-liter Coyote V8 engine and TVS 2650 Harrop supercharger, outputting 805 horsepower, matched with a 6-speed manual transmission.
Historic Classic Works Series: Notable past builds include the "Dragon" Mustang (sold for $346,500 at Barrett-Jackson 2013) and the "Razor" Camaro (sold for $269,500 in 2012). The brand is also known for high-horsepower muscle series like "Caged" and "Uncaged".
Ringbrothers offers a comprehensive catalog of tens of thousands of premium parts, including: CNC-machined billet aluminum components; Carbon fiber body panels, hoods, and exterior trim;
Target Audience: Global DIY enthusiasts and professional modification shops.
Revenue & Structure: Estimated annual operating revenue of ~$8.867 million (Kona Equity data). The company remains privately held, profitable, and self-funded, with a lean team of approximately 12 employees.
Auction Success: Ringbrothers' works are valuable on global top auction platforms. In 2013, its 1970 Dragon Mustang built by Ringbrothers was sold at Barrett-Jackson for $346,500; in 2012, the 1969 Razor Camaro transaction price was $269,500. As of 2026, Ringbrothers works at Barrett-Jackson auction total exceeds $2 million.
Demand: The brand's customer demand is extremely fierce, orders were booked until after 2021 as early as 2016. The brand continues to expand its influence through large exhibitions such as SEMA, Monterey Pebble Beach, Chicago, and Grand Rapids International Auto Show.
Ringbrothers' engineering capabilities in the custom modification field are top-tier, its core technology system is reflected in the following five aspects:
Roadster Shop Fast Track Stage III Chassis System This is the source of "skeleton" for all of Ringbrothers' top works (such as Kingpin and Octavia), customized and developed by Roadster Shop company according to vehicle needs. The system adopts independent front and rear suspension systems, greatly strengthening chassis rigidity and lightweighting levels, providing reliable support and precise handling feedback for modern high-horsepower engines (such as 800 horsepower Coyote V8).
Carbon Fiber Body & Ultra-Lightweighting Technology Octavia marks a major breakthrough in material craftsmanship for the brand. Almost the entire car is made of carbon fiber. Through CAD precision calculations and continuous over ten thousand hours of handmade production, the body has no traditional steel or aluminum panels, greatly reducing the vehicle weight. Assisted by thousands of wind tunnel tests, it forged a sleek fastback design, presenting aerodynamics in an artistic form on the car body surface.
Digital Precision Manufacturing Process (CNC & 3D Printing) The brand's factory is equipped with high-precision CNC tools. From aluminum blanks to precision shift paddles, door handles, pedal pads, and even complex turn signal stalks and other core components, all are realized through digital automatic milling and 3D printing technology, greatly reducing assembly tolerances while ensuring every part has uniform, jewelry-grade processing texture.
High-Performance Powertrain Integration Ringbrothers cooperates in-depth with power unit manufacturers such as Wegner Motorsports and Whipple. Engines range from 5.0-liter V8 basic versions to 2.65-liter supercharged versions, coupled with carefully designed intake and exhaust modules, achieving 800 to 805 horsepower, transmitted to the ground by Bowler 6-speed manual transmission. Whether it is straight-line acceleration or emergency braking, there is a strong reaction advantage.
Integrated Suspension & Running System Optimization All works are equipped with Fox Racing adjustable damping system and custom HRE wheels, the rear wheels are equipped with Michelin Pilot Sport 4S tires with a width of 345/30, corresponding to large-sized Brembo caliper braking systems with disc diameters of 10-14 inches responsible for ultimate safety assurance, perfectly combining modern grip, braking power and excellent handling texture.
Ringbrothers' core production and R&D bases are all located in Spring Green, Wisconsin, USA, with no branches or independent full vehicle production lines set up overseas. However, the brand's parts business has built a global sales network, parts sold to customers around the world. The brand achieves global brand exposure through international top exhibitions and car events, such as Monterey Car Week and Pebble Beach Auto Show, showcasing high-end custom models like Octavia. Supplier companies like Gentex also released limited custom parts on SEMA partner booths, selling globally through Ringbrothers online store (such as carbon fiber auto-dimming rearview mirrors listed in Q1 2026), further expanding the penetration of its parts in the global top custom market.
As of May 2026, Ringbrothers stands at the milestone of over twenty years since the brand's establishment, evolving from a "modification workshop" to a "world-class custom creation workshop". Its future positioning is highly clear: relying on breakthroughs in composites and digital manufacturing capabilities, maintaining an annual release roadmap of 1 to 2 top SEMA show cars, continuing to polish personalized, highly customized retail services. At the same time, the brand continues to improve in CNC machining. The parts product line has stable growth potential in the global B2C and B2B parts markets.
The challenge faced in the future is to maintain the creative soul of the traditional "hardcore internal combustion engine era" without dilution in the process of attracting new generation users, and how to maintain leadership in competition from other custom brands in the industry. From Ringbrothers' groundbreaking crossover works, the brand's creativity is at its peak. With the further consolidation of lightweighting and all-carbon manufacturing technologies, and the growth of online parts sales, Ringbrothers will continue to define the benchmark of "automotive art".
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