Girodisc Mercedes 358mm Rear Replacement Rings LSX Our ultra-lightweight FEA-optimized titanium retainer

Our ultra-lightweight FEA-optimized titanium retainer reduces the chance of valve float while securing the factory spring to the new IE pump assembly

HKS designed it larger than stock to support future power upgrades and track use

adjustable launch control

Clockable design ensures proper regulator orientation

most tested parts on the market

Girodisc Mercedes 358mm Rear Replacement Rings LSX Our ultra-lightweight FEA-optimized titanium retainerOur replacement rings are sold in pairs and include replacement hardware. The only parts you will reuse are your existing GiroDisc hats. Please note that unless specifically noted, GiroDisc replacement rings are only designed to work with GiroDisc hats. They are not designed to be used with other brands, including hats from cars equipped with 2 piece rotors from the factory.