Technical Information

Axle Specifications
Axle Sizing
Bearings
Brakes
StudPatterns

Axle Specifications

39mm Round Axles - 750kg per Axle rating. Runs LM (Holden) bearings

40mm Square Axles - 1000kg per Axle rating. Runs LM (Holden) bearings

45mm Square Axles - 1400kg per Axle rating. Runs SL (Ford) bearings

50mm Square Axles - 2000kg per Axle rating. 2.0T be

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• Axle length is measured from tip to tip of bare Axle

  Axle Length is determined by 2 variables-
  1.Frame width (chassis width to inside of wheels, not overall width. i.e. outside of mudguard to mudguard)
  2.Wheel offset (measured from the inside back of rim which bolts to hub, to the outside back of tyre)

• For wheels with standard offset (approx 120mm) such as HQ Holden & pre AU Ford, measure the frame width and add 17" (430mm) to determine correct axle length.
  e.g. Frame width of 6' x 4' = 48" (1220mm) + 17" (430mm) = 65" Axle.

• When Axles are sized in this way the inside face of std profile tyre will be approx +/- 50mm away from the frame.

• Standard mudguards @ 9" wide will be suitable for tyres up to 195mm
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  Bearings

LM (Holden bearings) suit 39mm Round & 40 mm Square Axles.

*Outer (small) bearings # LM 11910 - Cup
                                   # LM 11949 - Cone

*Inner (large) bearings # LM 67010 - Cup
                                  # LM 67048 - Cone

SL "slimline" (Ford bearings) suit 45mm Square Axles

*Outer (small) bearings # LM 68149 - Cup
                                   # LM 68110 - Cone

*Inner (large) bearings # LM 12749 - Cup
                                  # LM 12710 - Cone

Composite (Holden inner - Ford outer) bearings suit some 39mm Round & 40mm Square Axles.
Not a very popular combination to produce a marginally stronger stub axle- can cause a few headaches when bearing replacement is required!.

• Brake system is independent of tow vehicle . i.e. no controller required
• lower cost

Disadvantages

• Brake system requires trailer to be applying continual load to tow vehicle (i.e. pushing) when braking for brakes to operate
• maximum load 2000kg gross (trailer and load)

.

Electric Brakes

Advantages

• More efficient (larger) Brakes
• Amount of braking can be manipulated though brake controller as required (i.e. heavier loads require more braking power to be applied)
• Lower cost option for braking systems over 2000kg gross

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