OTR Grassmaster All Season 20X10.00-8 87A3 B Lawn & Garden Tire

What It Is

The OTR Grassmaster All Season 20X10.00-8 is a 4-ply rated lawn and garden tire designed for zero-turn mowers, riding mowers, and garden tractors that require a wider footprint for better traction on grass, dirt, and light mud. It’s an aftermarket replacement tire, not OEM.

Fitment & Compatibility

Before buying, confirm three things:

1. Size match – The tire is 20 inches tall, 10 inches wide, and fits an 8-inch rim. Measure your current tire’s sidewall markings (e.g., 20x10-8) to verify. If your mower uses a narrower tire (e.g., 20x8-8), this will be too wide and may rub against the deck or frame.

2. Rim width – This tire fits rims with a width range of 6.0 to 8.5 inches. Measure your rim’s inside width (bead-to-bead) to confirm.

3. Brand/model check – Common on Husqvarna, Craftsman, John Deere, and many zero-turn models (e.g., ZT series, D series), but always check your owner’s manual or current tire size. Not compatible with tight-deck zero-turns that use 18x9.5-8 or 20x8-8 tires.

Key Things to Know

• Tread pattern – The “All Season” tread is a multi-rib design with moderate lugs. It’s decent on grass and hardpack but struggles in deep mud or wet clay. Not a turf saver – may mark delicate lawns.
• Load rating – 87A3 = 545 lbs per tire at 28 PSI max. Fine for most residential mowers, but underbuilt for heavy commercial zero-turns with ballast or multiple attachments.
• Installation – Easy if you have basic tools and a tire spoon. The rubber is stiff when cold; warm it in the sun or use soapy water to seat the bead. Balancing is rarely needed for lawn tires.
• Common complaints – Some users report uneven wear after a season, especially on uneven terrain. Check air pressure monthly – underinflation accelerates wear.

Should You Buy It

Buy this tire if you need a budget-friendly, wide replacement for a residential zero-turn or garden tractor on flat lawns and light dirt, and you don’t mind a slightly rougher ride or occasional turf marking. Skip it if you mow on steep slopes, wet clay, or need a true turf-saver for delicate grass.