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Trojan Duratorque Axles Explained — NZ's Most Popular Trailer Suspension (2026 Guide)
Trojan Duratorque Axles — NZ's Most Popular Trailer Suspension
If you've ever wondered what makes a boat trailer ride smoothly on NZ roads, the answer is usually a Trojan Duratorque axle. These rubber torsion axles are the most popular trailer suspension system in New Zealand — and for good reason.
What Is a Duratorque Axle?
A Duratorque is a rubber torsion axle — a type of independent suspension where each wheel moves independently using rubber cords inside a square steel tube. Unlike leaf springs (which connect both wheels), each Duratorque arm twists against its own rubber elements.
This gives you:
- Independent wheel movement — Each wheel absorbs bumps separately, so the trailer stays more level
- Smoother ride — Rubber torsion is gentler than steel leaf springs, protecting your boat and gear
- Lower ride height — The axle mounts directly to the trailer chassis, no spring hangers needed
- Zero maintenance — No springs to rust, crack, or adjust. The rubber is sealed inside the tube
- Built-in damping — Rubber naturally absorbs vibration, reducing trailer bounce
Half Beam vs Full Beam — What's the Difference?
Half Beam Duratorque
Trojan Half Beam Duratorques are sold individually (one per side). You bolt two half-beams to opposite sides of your trailer chassis to create a complete axle. This is the most common configuration because:
- You can set the exact track width by adjusting mounting positions
- Easier to replace one side if damaged
- Works on any trailer width
- Available from 500kg to 1500kg+ per side
Full Beam Duratorque
Trojan Full Beam Duratorques are one-piece units spanning the full width of the trailer. They're custom made to order for your exact trailer width. Benefits:
- Maximum rigidity — Single-piece construction is stiffer than two half-beams
- Perfect alignment — Both wheels are guaranteed parallel
- Ideal for heavy-duty and tandem axle setups
Duratorque vs Leaf Springs — Which Is Better?
| Feature | Duratorque (Rubber Torsion) | Leaf Springs |
|---|---|---|
| Ride quality | ⭐⭐⭐⭐⭐ Smooth, damped | ⭐⭐⭐ Harsher, bouncy |
| Maintenance | Zero — sealed rubber | Grease, check for cracks |
| Ride height | Low — mounts to chassis | Higher — needs hangers |
| Ground clearance | Better (lower centre of gravity) | Less |
| Weight capacity | Up to 1500kg+ per side | Higher for very heavy loads |
| Repairability | Replace entire unit | Individual leaves replaceable |
| Cost | Higher upfront | Lower upfront |
| Best for | Boat trailers, general purpose | Very heavy loads, commercial |
Bottom line: For boat trailers and general-purpose trailers up to about 3500kg GTM, Duratorques are the better choice. For very heavy commercial trailers (logging, machinery), leaf springs may be more appropriate.
Choosing the Right Duratorque Size
Duratorques are rated by capacity per side. To choose the right size:
- Find your trailer's GTM (Gross Trailer Mass) on the compliance plate
- Divide by 2 for a single-axle trailer (that's the load per side)
- For tandem axle, divide GTM by 4
- Choose a Duratorque rated at or above that per-side figure
Example: A 2000kg GTM boat trailer needs at least 1000kg per side → choose a 1000kg or 1200kg Duratorque.
Shop Trojan Duratorque Axles
- Half Beam Duratorques — 18 options, sold individually
- Full Beam Duratorques (Custom Made) — Made to your trailer's exact width
Not sure which size? Call us on 09 820 8023 with your trailer's GTM and we'll recommend the right Duratorque. We stock a huge range at our Auckland shop — 1/348 Rosebank Road, Avondale.
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