2902 Dunbier R2178P Mackay Flat Parallel Rubber Roller 8" | Marine Trailer Part
2902 Dunbier R2178P Mackay Flat Parallel Rubber Roller 8" | Marine Trailer Part
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🔧 Product Description
Dunbier 8" Flat Parallel Rubber Roller – Part Number: 2902
A flat parallel-profile boat-trailer roller manufactured from rubber. The shaped or flat running surface supports and guides the hull during launch, retrieval and transport while allowing the boat to move along the trailer with less friction than a fixed bunk surface.
⚙️ Key Features
- Roller material: rubber
- Profile: flat parallel
- Nominal size: approximately 200mm long × 60mm diameter
- Free-rolling hull support for marine trailers
- Replacement for worn or seized Dunbier rollers
- Material hardness selected for the listed support style
📏 Specifications
- Nominal size: approximately 200mm long × 60mm diameter
- Material: rubber
- Shape: flat parallel
- Bore and shaft diameter must be checked against the existing installation
🔄 Cross Reference & Related Parts
- Dunbier: 2902
- Mackay: R2178P
- Select related Dunbier roller by length, profile, bore and shaft diameter
- Roller shafts and brackets are sold separately unless stated
🚤 Trailer Compatibility & Application
- Suitable for compatible Dunbier keel, crossmember and roller-rack assemblies
- Hard-poly rollers provide low rolling resistance and durability
- Soft-poly or rubber rollers provide more cushioning but may deform under high point loads
- Roller size and position must match the hull support plan
🔌 Function
Carries and guides the hull along the trailer while rotating around the roller shaft.
⚠️ Common Signs of Failure
- Roller is split, glazed or permanently flattened
- Bore is enlarged and the roller wobbles
- Roller does not rotate freely
- Material transfers marks or has worn through
- Hull contacts the metal bracket
🛠️ Installation & Safety
- Support the boat before removing a load-bearing roller
- Inspect the shaft for grooves, bending and corrosion
- Use correct washers, split pins or retaining clips
- Allow free rotation without excessive side play
- Reset adjacent roller heights so the hull load remains evenly distributed
📦 Condition
- Genuine Dunbier Marine Products part
- Brand new
- Supplied as one 8" flat parallel rubber roller
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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