OTR Grassmaster All Season 20X8.00-8 79A3 B Lawn & Garden Tire

What It Is

The OTR Grassmaster All Season 20X8.00-8 79A3 B lawn & garden tire is a universal replacement tire designed for riding mowers, zero-turn mowers, and lawn tractors. It’s built for all-season use, offering traction on grass, dirt, and light pavement without damaging turf.

Fitment & Compatibility

Before buying, measure your existing tire: this is a 20-inch outer diameter, 8-inch wide tire on an 8-inch rim. Check your mower’s wheel bolt pattern and hub size—most standard lawn tractors (e.g., John Deere, Cub Cadet, Husqvarna) use 4 on 4-inch or 4 on 5.5-inch patterns, but this tire only includes the rubber, not the rim. Confirm your rim’s width (typically 5-7 inches) matches the tire’s 8-inch width. OEM part numbers vary, but this tire fits many models requiring a 20x8.00-8 size, like those on older Craftsman or MTD decks. Measure your current tire’s sidewall markings to be sure—don’t rely on mower model alone.

Key Things to Buy

• Quality concerns: With a 3.2 rating from only 9 reviews, some users report uneven wear or sidewall stiffness. It’s a budget option—not premium like Carlisle or Kenda.
• Installation: Mounting on the rim is DIY-friendly if you have tire irons and a bead seater. Tubeless design, but check your rim for rust or damage before mounting.
• Tread pattern: The “All Season” tread is moderate—good for mixed terrain but not aggressive mud or snow. The 79A3 load rating (approx. 300 lbs per tire) is fine for most residential mowers.
• Gotcha: This tire is bias-ply, not radial—so it may ride rougher on uneven ground and wear faster at high speeds.

Should You Buy It

If you need a cheap, quick replacement for a worn 20x8.00-8 tire on a light-duty riding mower, this works—but expect average durability and ride comfort. For heavy use, rocky terrain, or long seasons, invest in a higher-rated brand.