(2) Reaper Turf Tire Assemblies 18x9.50-8 Fits Cub Cadet RZT 50" 54" 634-04128

What It Is

This is a set of two rear turf tires (18x9.50-8) with rims, designed to replace worn or damaged tires on Cub Cadet RZT zero-turn mowers with 50" or 54" decks. They provide traction and support for the drive wheels on residential or light commercial mowing.

Fitment & Compatibility

Before buying, verify these three things:

• Model & deck size: Fits Cub Cadet RZT models with 50" or 54" decks (e.g., RZT 50, RZT 54). Not for 42" or 60" deck variants.
• OEM part number: Replaces OEM 634-04128. Cross-check your mower’s manual or existing tire part number.
• Tire size & bolt pattern: 18x9.50-8 (tire diameter 18", width 9.5", rim 8"). Confirm your bolt pattern is 4 on 4" center (standard for Cub Cadet RZT). Measure center hole diameter (typically 3/4") and ensure wheel offset matches (usually 2" offset).
• Aftermarket vs. OEM: This is a non-OEM aftermarket assembly. Tread pattern and rubber compound may differ slightly from original, but dimensions and bolt pattern are designed to match.

Key Things to Know

• Quality: Turf-saver tread is good for lawns (low ground pressure), but not for heavy mud or rocky terrain. Expect reasonable lifespan with normal use.
• Installation: Straightforward swap—jack up rear, remove lug nuts, replace assembly. Torque to 45-55 ft-lbs. No special tools required.
• Common gotchas: Check that valve stem clears the mower frame or brake linkage before tightening. Some users report slight offset differences—measure your existing wheel offset (distance from mounting face to rim center) to avoid rubbing.
• Weight: Each tire+rim assembly weighs ~15-18 lbs. Ship weight may be higher due to packaging.

Should You Buy It

Yes, if you need a direct-fit, budget-friendly replacement for worn rear tires on a Cub Cadet RZT 50" or 54" mower, and you’re comfortable with an aftermarket part that matches OEM specs. Not ideal if you demand exact OEM rubber compound or need aggressive traction for steep hills or wet turf.