Description
The 8″ / 203mm drive wheel is the largest and most critical wheel on the Radius Master belt grinder. As both the primary belt drive wheel and a large-radius grinding station, it carries significant workload in any active workshop. The Old Style designation refers to the hub geometry, bore, and rubber specification of the original Radius Master production run — earlier machines were built to a slightly different specification than the current Series 2, and fitting the wrong wheel will result in an incorrect fit or poor tracking performance.
If your machine predates the current Series 2 production, this is the correct replacement wheel. The Old Style Drive Wheel is manufactured to the same specification as the original factory-fitted part, ensuring a direct drop-in replacement with no machining or adaptation required.
Like the current New Style wheel, the 8″ contact surface on older Radius Master machines is equally versatile: it serves as the primary belt drive point at the base of the head, and as a large-radius grinding station for primary bevel grinding, weld blending, radius work, and heavy stock removal. It also supports use of the Drive Wheel Tool Rest (RM-DWTR) and Hollow Grinding Jig (RM-HGJ) accessories.
Signs your drive wheel needs replacing:
- Belt slipping or surging under grinding load
- Belt drifting despite tracking adjustments being correct
- Vibration or roughness felt through the machine at belt speed
- Visible flat spots, surface cracking, rubber separation, or glazing
- Bearing roughness or play when spinning the wheel by hand
- Uneven belt contact across the 50mm belt width
Company Information
This is a genuine spare part manufactured by NIROC, the Australian company that acquired Radius Master Machinery in 2025. NIROC maintains the full Radius Master spare parts catalogue — including both Old Style and New Style variants of the drive wheel — to support the entire Radius Master install base, from the earliest machines still running in workshops across Australia to current Series 2 production. All spare parts are engineered to original specification and backed by local Australian support.
Features & Specifications
| Feature | Specification |
|---|---|
| Make | Radius Master / NIROC |
| Product Name | Old Style Drive Wheel 8″ / 203mm |
| Part Type | Genuine OEM spare part |
| Diameter | 203mm (8″) |
| Style | Old Style (pre-Series 2 / earlier production machines) |
| Compatible Machines | Radius Master RM-48 earlier/original production (pre-Series 2) |
| Function | Belt drive wheel and large-radius contact grinding surface |
| Belt Compatibility | 50 x 1220mm (2″ x 48″) |
| RRP (AUD) | $329.00 |
| Country of Origin | Australia |
| Supplier | NIROC (niroc.com.au), authorised Radius Master dealers |
Important — confirm your machine variant before ordering. The Old Style and New Style drive wheels share the same external diameter but differ in hub geometry. If you are unsure which variant suits your machine, contact NIROC with your machine serial number before purchasing.
Further Information
How to Tell Old Style from New Style
The easiest way to confirm which drive wheel your machine requires is to contact NIROC directly with your machine’s serial number. Alternatively, if you know your machine’s approximate age or production batch, NIROC can advise which variant is correct. As a general guide, machines produced before the current Series 2 revision will require the Old Style wheel.
Fitting the incorrect wheel may result in improper seating on the drive shaft, incorrect belt alignment, or tracking instability — so it is worth confirming before ordering.
Keeping an Older Radius Master Running
One of the most compelling arguments for the Radius Master as a long-term workshop investment is the 20-year design life and the ongoing availability of genuine spare parts. Many Radius Master owners have machines that are 10, 15, or even 20+ years old and still producing excellent work. With genuine NIROC parts readily available, there is no reason these machines can’t continue in service for decades more. Replacing a worn drive wheel is one of the most effective ways to restore an ageing machine to like-new performance.
Proactive Maintenance
If your machine is several years old and due for a service, it’s worth inspecting the tracking wheel, belt tensioner, and platen assembly at the same time as the drive wheel — NIROC stocks all of these as individual spare parts.
