Bigger is better!
It is no secret that the M12 studs used in E36, E46 and E9X BMWs are too small for serious track and competitive driving. Even if made from the best materials available, the M12 will be wind up breaking at the most inopportune times. While companies such as Porsche, VW and Audi have been using M14 size bolts and studs for many years, BMW finally switched to M14 studs (M14 x 1.25) with their F-Series vehicles. Rogue Engineering has developed a jig to accurately drill and tap your existing 5x120 hubs to accept M14 studs! Simply changing from the M12 to M14 size is already a 30% increase in strength!
While very simple in appearance, the jig is CNC'd from 6061-T6 aluminum with very specific holes for the conversion process. While some holes are designed for drilling, other holes are designed for holding and others for tapping. The conversion process should take approximately 30 minutes per corner when following the included directions. After all of the holes have been drilled and tapped for the new M14 size, all of the rotors need to be removed so that the bolt holes can be opened up to 5/8".
Fortunately, most wheels do not require any modification and they will fit without issue.
The Conversion Kit
Included in the kit are the following parts:
- Rogue Engineering Wheel Stud Conversion Jig
- Bolting hardware
- Required drill for the hub (drill for the rotor not supplied)
- Required tap for the hub (select 1.5mm pitch or 1.25mm pitch)