Renk Group, the Gearbox Inside Nearly Every Western Tank
Renk Group makes the transmissions inside most of the Western world’s heavy armored vehicles, an Augsburg company founded in 1873 whose gearboxes drive the Leopard 2, the Puma and South Korea’s K2, and whose revenue passed roughly €1.1 billion in 2024. Few defense companies are less known relative to how much combat power rolls on their products.
What does Renk make
| Item | Detail |
|---|---|
| Full name | RENK Group AG |
| Headquarters | Augsburg, Germany; founded 1873 |
| Employees | Roughly 3,500 worldwide, company-reported |
| Revenue | About €1.1 billion in 2024, company-reported, with a multi-year backlog |
| Ownership | Listed on the Frankfurt exchange since February 2024; Triton’s stake reduced since the IPO |
| Main sites | Augsburg and other German plants, SESM in France, Muskegon in the US |
| Core products | Tracked-vehicle transmissions and powerpacks, naval gears and propulsion, bearings, test systems |
Renk builds the hardest mechanical problem in land warfare: a gearbox that takes 1,100 to 1,500 horsepower, shifts under fire, steers a 60-tonne tracked hull through mud, brakes it downhill, and survives being treated like a consumable. Its portfolio spans complete powerpacks and transmissions for tanks and IFVs, naval propulsion gears, slide bearings and industrial drive systems, plus the test rigs on which armies qualify their own fleets. Around two thirds of the business is defense, and almost every Western tracked-vehicle program touches an Augsburg drawing.
Renk tank transmissions
| Vehicle | Renk content |
|---|---|
| Leopard 2 | HSWL 354 transmission in every variant, from 2A4 to 2A8 |
| Puma IFV | HSWL 256 compact transmission |
| K2 Black Panther | Renk transmission paired with Korean engines in serial batches after the domestic gearbox struggled in durability testing |
| Lynx KF41 | Renk gearbox in Rheinmetall’s new IFV family |
| Leclerc | Renk-designed automatic transmission built under the SESM label in France |
| Upgrades and others | Recovery vehicles, bridgelayers and howitzer chassis across NATO fleets |
The K2 case shows Renk’s quiet leverage. South Korea builds nearly everything domestically, yet successive K2 batches still pair Korean engines with Renk transmissions, and export-driven demand from Poland’s huge K2 order flows partly through Augsburg. The reverse case is Turkey’s Altay program: German export restrictions cut off the planned Renk gearbox, stalling the program for years until Korean and then domestic alternatives appeared, a lesson every procurement office noticed.
Renk naval gears and other businesses
At sea, Renk reduction gears and hybrid propulsion systems serve frigates and corvettes across NATO and partner navies, including German-designed MEKO-family ships, and its couplings and bearings run in commercial marine and energy applications worldwide. The civilian and test-systems businesses matter strategically: they kept the company alive through the 1990s and 2000s, when Western armies stopped buying tanks and a pure tank-gearbox maker would have died, taking an irreplaceable industrial capability with it. Naval work also gives Renk a second growth leg now, since Europe’s frigate and corvette order books are expanding almost as fast as its armor programs, and every new hull needs a gear train qualified for decades of service.
Who owns Renk
Renk spent decades inside MAN and then the Volkswagen group, which sold it to private equity firm Triton in 2020. Triton listed the company on the Frankfurt exchange in February 2024, one of the first defense IPOs of Europe’s rearmament era, and has since reduced its stake while the share price multiplied with the sector. Leadership has leaned into the defense identity, positioning Renk alongside Rheinmetall and Hensoldt as one of Germany’s rearmament trio in investor shorthand.
Renk’s growth since 2022
Every European tank order lands in Augsburg eventually. Leopard 2A8 buys from Germany, Lithuania, the Netherlands, Norway and others each carry an HSWL 354; Puma retrofits, Lynx wins and K2 exports stack further work; and fleets being pulled from storage for Ukraine need overhauled drivetrains. Renk has responded with capacity investment in Augsburg and its US plant in Muskegon, Michigan, which serves American tracked-vehicle programs. Reported revenue rose past €1.1 billion in 2024 with an order backlog several times that, and the company has guided toward continued double-digit growth, figures that are company-reported but consistent with the visible order flow.
Renk Group frequently asked questions
What does Renk Group do?
It builds transmissions and powerpacks for tanks and IFVs, naval propulsion gears, slide bearings and test systems, with defense around two thirds of revenue.
Which tanks use Renk transmissions?
The Leopard 2 (HSWL 354), Puma IFV (HSWL 256), K2 Black Panther serial batches, Lynx KF41 and the Leclerc through Renk’s French operation, among others.
Who owns Renk?
Renk is publicly listed on the Frankfurt exchange since February 2024; private equity firm Triton, which bought it from Volkswagen in 2020, has been selling down its stake.
How big is Renk?
Reported revenue of roughly €1.1 billion in 2024, with several thousand employees across Augsburg, other German sites and Muskegon, Michigan.
Why could Turkey not buy Renk transmissions for the Altay?
German export restrictions blocked the planned transfer, which stalled the Altay for years and pushed Turkey toward Korean and then domestic powerpack suppliers.
- Renk Group annual report and investor communications (company-reported figures)
- Wikipedia – Renk Group (accessed October 2026)
- Program reporting on Leopard 2, Puma, K2 and Lynx drivetrains
- Defence & Tech reporting on the German defense industrial base
