HD (Heavy Duty) mounting stud upgrade (service)

This upgrade will replace standard -W mounting studs with bigger diameter HD (Heavy Duty) mounting studs on following kits:

• BMW E30 / E36 / E46 - Roll-center / bump steer correction -kit
  
• BMW E30 / E36 / E46 - RACE front control arms with roll-center / bump steer correction -kit
  
• BMW E30 / E36 / E46 - Bump steer adjustable tie rod -kit (20±5mm variations only)
  

This item is an upgrade service for the selected kit NOT A PHYSICAL PRODUCT!
If you need the mounting studs or hardware separately please see our Spare parts collection.

Control arm end D=14mm / 14x1.5mm -> D=16mm / 16x1.5mm top end thread.
Tie rod end D=12mm / M12x1.5mm -> D=14mm / 14x1.5mm top end thread.

This upgrade is as default on E46 M3 kits (sold after 1/2025) on control arm side.
This upgrade is as default on E46 non-M and E46 M3 kits (sold after 10/2026) on tie rod side.

E30 and E36 spindles require drilling out the taper on both control arm and tie rod side.
E46 non-M spindles require drilling out the taper on the control arm side.