Ryobi RAC434 33cm Lawnmower Blade for OLM1833B (Single)

What It Is

The Ryobi RAC434 is an OEM replacement blade for the Ryobi OLM1833B 33cm cordless lawnmower. It’s a single, universal-fit blade designed for standard grass cutting on small-to-medium residential lawns.

Fitment & Compatibility

Before buying, confirm your mower is the Ryobi OLM1833B (33cm/13-inch deck). This blade is not compatible with other Ryobi mowers like the 40V 36cm models (e.g., RY40180) or older 18V 33cm units (e.g., OLM1833). Measure your existing blade: length must be 330mm (13 inches), center hole diameter 15mm, and thickness 2mm. The blade uses a single-bolt mounting system—verify the bolt pattern matches your mower’s spindle. It’s an OEM part, so no aftermarket fitment issues, but double-check the part number on your current blade (stamped near the center hole). If you have a mulching or bagging OLM1833B variant, this blade works for both.

Key Things to Know

• Quality: OEM Ryobi steel blade—sharp out of the box, holds edge longer than generic replacements. Balanced for minimal vibration.
• Installation: Simple—remove the single bolt, swap blades, torque to 30-40 ft-lb. No special tools needed beyond a socket wrench. Always disconnect the battery first.
• Gotcha: The blade is directional; the “cutting edge” arrow must face upward toward the deck when installed. Installing upside-down will dull quickly and cause poor cut quality.
• Life: Expect 25-50 hours of cutting before needing replacement, depending on grass type and debris. Dull blades tear grass, leading to browning—sharpen or replace as needed.

Should You Buy It

If you own a Ryobi OLM1833B and want a guaranteed fit, this blade is the right choice—it’s reliable, easy to install, and priced competitively for OEM quality. Avoid if you have a different mower model or need a mulching-specific blade (this is a standard lift blade). For light residential use, it’s a solid, no-surprises replacement.