Radium FST Mounting Bracket (Frame Rail Mount) (13-0011) Bosch Cosworth Size 1 main bearings

Cosworth Size 1 main bearings for the 4B11 Evo X engine are a nominal standard size and are used for most applications

now made in-house at STM and the new design fits all 4G63

this conversion uses a "moustache bar" to separate and move the crotch straps outward

Lower spring rates can be stiffened up by using the wide damping range as an artificial spring rate

Radium FST Mounting Bracket (Frame Rail Mount) (13-0011) Bosch Cosworth Size 1 main bearingsThe Radium FST Frame Rail Mounting Bracket has a 90 bend cantilevered. This bracket is constructed from steel for superior strength and nickel plated to resist corrosion which allows components to be grounded to the spare hole in the bracket. This assumes the bracket is mounted to an electrically conductive material such as a steel frame. *Limited Quantity* These have been discontinued by Radium in Dec 2025. STM does have a few remaining in stock!