18X9.50-8 4 Ply Reaper Tire

What It Is

This is a 4-ply rated replacement tire (size 18x9.50-8) designed for riding lawn mowers, garden tractors, and zero-turn mowers. It’s built for general turf use, offering a balance of traction and durability on grass, dirt, and light slopes.

Fitment & Compatibility

Before buying, verify these three things:

• Tire size: Must be exactly 18x9.50-8 (18” outer diameter, 9.50” wide, 8” rim diameter). Measure your current tire’s sidewall markings—don’t guess based on your mower model.
• Rim width: This tire fits rims with a width range of 6.5” to 8.5”. Measure your rim’s bead seat width; using a rim outside this range can cause poor seating or handling.
• Mower clearance: Check that the 18” diameter won’t rub against your mower deck, frame, or steering linkage when fully turned. This is especially critical on zero-turns with tight wheel wells.
• OEM vs aftermarket: This is an aftermarket tire, not an OEM part. It will fit any mower that originally used an 18x9.50-8 tire (e.g., many John Deere, Cub Cadet, Husqvarna, and Troy-Bilt models), but confirm your rim’s bolt pattern and hub size separately if buying a wheel/tire assembly.

Key Things to Know

• 4-ply rating: This is a light-duty turf tire—fine for residential mowing, but not for heavy commercial use, rocky terrain, or aggressive slopes. The tread is shallow and won’t dig in like a bar tire.
• Installation difficulty: Moderate. You’ll need a tire spoon, bead sealer, and an air compressor capable of seating the bead (around 40-50 PSI). If you’re not comfortable mounting tires, budget $10-20 per tire for a shop to do it.
• Common gotcha: The sidewall is fairly stiff for a 4-ply. Soaking the tire in warm water or using a lubricant can help seat the bead. Also, check valve stem clearance—some aftermarket tires have a different stem angle than OEM, which may hit the rim or brake caliper.
• Tread pattern: It’s a straight-rib design, good for smooth, even cuts on flat lawns. Not ideal for wet grass, mud, or hills—you’ll lose traction quickly.

Should You Buy It

Buy this tire if you need a budget-friendly, decent-quality replacement for a riding mower used on flat, dry turf and you’re comfortable mounting it yourself. Skip it if you mow on slopes, wet grass, or rough ground—you’ll want a 6-ply or bar-tread tire for better traction and puncture resistance.