H&R Note 3

All DR-Systems require longer wheel-bolts. These have to be ordered separately. When ordering wheel-bolts please follow these guidelines:

1. If possible name the type of the wheel when ordering.
2. New bolts must be longer than the original ones by half of the total Track-widening. For example: With a 30 mm DR-kit you will require bolts that are 15 mm longer than the original bolts.
3. The bold-head (taper-head, round-head, etc.) must be identical to the existing bolt.
4. For the current tightening torques (pay attention to possible differences between aluminum and steel wheel rims), refer to the information provided by the vehicle manufacturer concerning the attachment of series-production wheels, or, if using special-purpose wheels, refer to the specifications of the wheel manufacturer, as well as the parts certificate concerning wheel spacer.
   Verify the minimum thread reach of the elongated wheel bolts:
   Thread M12x1.25 = at least 8.0 rotations = approx. 10 mm of load-bearing thread
   Thread M12x1.50 = at least 6.5 rotations = approx. 10 mm of load-bearing thread
   Thread M12x1.75 = at least 6.5 rotations = approx. 12 mm of load-bearing thread
   Thread M14x1.25 = at least 9.0 rotations = approx. 12 mm of load-bearing thread
   Thread M14x1.50 = at least 7.5 rotations = approx. 11 mm of load-bearing thread
   Thread 1/2? UNF = at least 8.0 rotations = approx. 11 mm of load-bearing thread
5. Please ensure that the wheel screws do not damage any part of the brake system (ABS sensors etc.) Turn the wheel first by hand and check clearance on the inside (max. tolerance for some vehicles is only 2 mm (RA Mercedes).