Overview
The GMZ Race Products 30×9.5R15 Ivan Stewart Ironman Edition (part number MRWIS309515AT) is an 8-ply UTV tire for a 15-inch rim. Its tread combines Lug Freeing Sipes (LFS) and Progressive Traction Blocks (PTB), two features GMZ highlights.
The LFS are parallel grooves that let each lug segment move individually over uneven terrain. The PTB sit on the upper sidewall to add forward bite in deep two-track and silt. The flat contact patch gives more forward grip and more even tread wear, and the proprietary tread pattern is designed for traction and predictable lateral stability. The medium single durometer compound is formulated for high-performance machines.
Key features
- Lug Freeing Sipes (LFS) for individual lug movement over uneven terrain
- Progressive Traction Blocks (PTB) on the upper sidewall
- Proprietary tread pattern for traction and predictable lateral stability
- Medium single durometer compound for high-performance machines
- Flat contact patch for forward grip and even tread wear
- 8-ply bias construction that GMZ says prevents punctures
Tread features for deep sand
Traction on loose ground comes from how the tread engages the surface, not from tread depth alone. Sipes and sidewall blocks change how the tire grips as the machine leans and as the lugs flex. In deep two-track, a tire that keeps its shape under load helps the machine track straight rather than wandering into ruts.
When replacing a UTV tire, consider the terrain you ride most. Aggressive lugs often deliver more bite in silt but can run louder and wear faster on hard surfaces. Check the wheels for bead fit and clean sand from the rim after each ride, and inspect tread blocks for chunking or tearing, which signals a need for replacement.
- Match tread style to your most common terrain
- Check tread blocks for chunking or tears
- Clean sand from the bead after each run
Specifications
| Brand | GMZ Race Products |
|---|---|
| Part number | MRWIS309515AT |
| Tire size | 30×9.5R15 |
| Tire height | 30 |
| Tire width | 9.5 |
| Rim diameter | 15 inches |
| Tire type | UTV |
| Ply rating | 8 ply |
| Tread style | Ivan Stewart Ironman Edition |
| Compound | Medium single durometer |
| Sidewall | Black letters |
Vehicle fitment
Choose it by the 15-inch rim diameter and 30×9.5R15 size. Check clearance at full lock to confirm it suits your UTV’s suspension and body.
Confirm your vehicle’s year, model and trim before ordering.
What’s included
One tire, sized 30×9.5R15.
Not included: a 15-inch wheel.
