(1) OTR 20x8.00-8 Grassmaster 4 Ply Tire for Lawn Garden Tractor - Zero Turns

What It Is

The OTR 20x8.00-8 Grassmaster 4 Ply Tire is a replacement drive tire for zero-turn mowers, lawn tractors, and garden tractors. It’s designed for use on the rear axle of machines with a 20-inch tire diameter, 8-inch width, and 8-inch rim.

Fitment & Compatibility

Before buying, verify these three things:

• Tire size: Must be exactly 20x8.00-8. If your current tire is 20x10-8 or 20x8.50-8, this tire is narrower and may not fit the rim or provide proper traction.
• Rim size: Requires an 8-inch diameter rim. Check that your rim width is between 5.5 and 7 inches (the tire’s approved rim width range).
• Tread pattern: This is a turf-friendly “Grassmaster” tread, not a heavy-duty or knobby tire. It’s for lawn use, not mud or rough terrain.
• OEM fitment: Common on older Gravely, Ariens, John Deere, and Cub Cadet zero-turns, but always measure your current tire and rim before ordering.

Key Things to Know

• Quality: 4-ply rating means decent puncture resistance for residential use, but it’s not a heavy-duty tire. Some users report thinner sidewalls than OEM tires.
• Installation: Mounting requires basic tools (tire spoons, air compressor). No special adapters or hubs are needed if your rim is standard 8x7.
• Common gotcha: The 3.4-star rating (only 3 reviews) suggests mixed user experiences—some report fast wear or imbalance. Check return policy before buying.
• Tread depth: Typically around 3/8-inch, which is fine for grass but not for slopes or wet surfaces.

Should You Buy It

If you need a budget-friendly replacement for a worn rear tire on a residential zero-turn or tractor, this will work—but it’s a gamble on quality. For heavy use or demanding terrain, spend more on a known brand like Carlisle or Kenda.