Future Classic BMW 54mm Classic Stud KitFuture Classic BMW 54mm Classic Stud Kit. Just like the 80mm Future Classic steel stud, these have world class, independently verified strength ratings (12. 9+) thanks to its chromoly construction. As you'd expect from Future Classic, these are as beautiful as they are functionala generous 6mm shoulder and buffer zone help safeguard against over tightening while also adding a defining design cue. In contrast to FC's larger stud brethren, this shorty