# 2908B Dunbier Hard Poly Keel Roller Black 8 | Marine Trailer Part

🔧 Product Description

  

Dunbier Black Hard-Poly Keel Roller 8 Inch - Part Number: 2908B

  

A black hard poly keel-support roller for boat-trailer keel and hull-support systems. The 8" / approximately 200mm roller is designed to provide controlled hull support and smooth movement during launch and retrieval while matching the specified pin and bracket system.

  

⚙️ Key Features

  

• black hard poly construction

• keel-support profile supports and guides the hull

• Nominal roller size: 8" / approximately 200mm

• Designed for repeated immersion and boat-trailer launch/retrieve cycles

• Replaceable independently of a serviceable bracket or roller rail

  

📏 Specifications

  

• Nominal size: 8" / approximately 200mm

• Approximate dimensions: approximately 200mm overall; confirm exact profile and end diameter

• Centre bore: confirm against installed roller, commonly 20-21mm class

• Recommended matching roller pin: Dunbier 3020B or 3020S where the bore is 20mm

• Material/profile: black hard poly, keel-support

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 2908B

• Related blue hard-poly dogbone: Dunbier 2908D

• Related grey hard-poly dogbone: Dunbier 2908G

  

🚤 Trailer Compatibility & Application

  

• Best suited to aluminium and robust metal hull-contact applications where low rolling resistance and shape retention are priorities

• Bracket width, roller-pin diameter and installed clearance must match the existing trailer

• The roller should contact a structurally supported hull area rather than fittings, strakes or unsupported panels

• Roller shape and firmness should be matched to the hull material and keel profile

  

🔌 Function

  

Supports the boat during storage and road transport while allowing the hull to roll over the trailer during launching and retrieval. The shaped profile also helps maintain centreline alignment.

  

Common signs of wear or replacement:

  

• Roller is cracked, split, flattened or permanently distorted

• Material has hardened, softened excessively or become UV-damaged

• Centre bore is elongated and allows the roller to wobble

• Roller no longer turns freely on the pin

• Hull develops marks because the roller surface is damaged or contaminated

  

🛠️ Installation & Safety

  

• Support the boat safely before removing any load-bearing roller

• Use the specified pin diameter with suitable washers and retaining hardware

• Align the roller so the hull load is centred across the profile

• Confirm free rotation without excessive side movement

• Recheck all roller heights and hull support after replacement

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one 8" / approximately 200mm black hard poly roller

• Supplied in original or equivalent packaging

## Details

- **Price:** 16.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 16.50 AUD | In stock |

## Images

- 2908B Dunbier Hard Poly Keel Roller Black 8 | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/2908b-dunbier-hard-poly-keel-roller-black-8)
> Updated: 2026-08-05