European Hub & Brake repairs -tips
Knott or Al-Ko – HOW DO I MEASURE THE BOLT PATTERN ON EUROPEAN BRAKE DRUMS?
| Bolt Circle Bolt pattern involves two different dimensions. Bolt circle indicates how many bolt holes a drum has and the diameter of a bolt circle. A bolt circle may for example be 4 × 100. Such a bolt circle indicates a drum with four bolts and the number of millimeters which is the circle’s diameter (100 in this example).  Drum with four bolts A drum with four bolts you can measure bolt circle from the edge of the bolt hole to bolt hole inner edge straight across the hub bore or center hole to center hole straight across the hub bore.  Drum with five bolts A drum with five bolts you measure from the center of one hole straight across the hub bore to an imaginary line midway between the two holes on the opposite side. |
| Variant, Brian James, Ifor Williams, Brenderup or Nugent – they all use a four or a five stud pattern. |
“All Variant trailers with braking are equipped with a hand brake, which is recommended to use when the trailer is parked. For long-term parking the hand brake should not be used, as the braking may stick. The hand brake is activated by pulling the hand brake handle over the dead center whereafter the gas spring tightens the brake and keeps it activated.”
–Variant Trailers
5 Stud wheel – Variant
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