# 1294 Dunbier H3942 Mackay Knott Swing-Up Jockey Wheel Heavy-Duty TK57-210/75m | Marine Trailer Part

🔧 Product Description

  

Dunbier Knott TK57 Heavy-Duty Side-Wind Swing-Up Jockey Wheel 210 × 75mm - Part Number: 1294

  

A premium heavy-duty Knott TK57 swing-up jockey wheel with a broad 210 × 75mm wheel for improved support on softer surfaces. Dunbier and Mackay catalogue a 545kg capacity and 255mm lift height; current Knott TK57 versions may be marked 500kg static load, so the supplied unit's rating governs.

  

⚙️ Key Features

  

• Knott TK57 side-wind mechanism

• Wide 210 × 75mm wheel

• Swing-up travel bracket

• Galvanised finish for marine trailer use

• Broad wheel reduces ground pressure compared with the 50mm version

  

📏 Specifications

  

• Catalogue capacity: 545kg Dunbier/Mackay

• Current Knott family static rating may be 500kg depending version

• Lift height: Approximately 255mm

• Wheel size: 210 × 75mm

• Outer tube diameter: TK57 57mm family

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 1294

• Mackay: H3942

• Knott family: TK57 Premium

• Replacement handle: Dunbier 1295

• Replacement wheel: Dunbier 1296

• Replacement cap: Dunbier 1291

• Related gear components: Dunbier 1280, 1301 and 1302 where compatible

  

🚤 Trailer Compatibility & Application

  

• Suitable for medium and heavy trailers within the permanent rating

• Wide wheel is useful on gravel, compacted dirt and uneven launch areas

• Confirm sufficient clearance for the 75mm wheel when swung up

  

🔌 Function

  

Supports and height-adjusts the trailer drawbar and assists manual positioning on firm surfaces.

  

Common signs of wear or replacement:

  

• Wheel hub or tread is damaged

• Handle gear skips under load

• Swing lock is loose

• Tube bends or develops excessive play

• Grease is contaminated by water because the cap is missing

  

🛠️ Installation & Safety

  

• Mount to a structurally sound drawbar with correct hardware

• Use wheel chocks before uncoupling

• Retract and lock the assembly before road travel

• Maintain screw and gear lubrication

• Do not use as an axle jack or permanent support stand

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one complete Knott TK57 210 × 75mm heavy-duty jockey wheel

• Supplied in original or equivalent packaging

## Details

- **Price:** 257.4 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 257.40 AUD | In stock |

## Images

- 1294 Dunbier H3942 Mackay Knott Swing-Up Jockey Wheel Heavy-Duty TK57-210/75m | Marine Trailer Part
- 1294 Dunbier H3942 Mackay Knott Swing-Up Jockey Wheel Heavy-Duty TK57-210/75m | Marine Trailer Part
- 1294 Dunbier H3942 Mackay Knott Swing-Up Jockey Wheel Heavy-Duty TK57-210/75m | Marine Trailer Part
- 1294 Dunbier H3942 Mackay Knott Swing-Up Jockey Wheel Heavy-Duty TK57-210/75m | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1294-dunbier-knott-swing-up-jockey-wheel-heavy-duty-tk57-210-75m-mackay-h3942)
> Updated: 2026-08-03