534779001 Rear Skirt Guard Flap Parts Compatible with Ryo-bi Lawn Mower Ryobi 20" Cordless Electric Lawnmower Models RY40107, RY40108, RY40109, RY401011, RY401012, Fits Smart-Trek RY40LM03, RY40LM30 Review

Name: 534779001 Rear Skirt Guard Flap Parts Compatible with Ryo-bi Lawn Mower Ryobi 20" Cordless Electric Lawnmower Models RY40107, RY40108, RY40109, RY401011, RY401012, Fits Smart-Trek RY40LM03, RY40LM30
Brand: Ryobi
Price: 11.95 USD
Availability: InStock

By the Mowers.Cloud editorial team · How we research & rate · Updated June 2026

★★★★★½ 4.7/5 (38 reviews)

$11.95

Brand: Ryobi

534779001 Rear Skirt Guard Flap Parts Compatible with Ryo-bi Lawn Mower Ryobi 20" Cordless Electric Lawnmower Models RY40107, RY40108, RY40109, RY401011, RY401012, Fits Smart-Trek RY40LM03, RY40LM30

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Overview

This isn’t a mower—it’s a critical replacement part for Ryobi’s 20-inch cordless electric mowers. The 534779001 Rear Skirt Guard Flap is a molded plastic guard that sits behind the rear wheels, preventing debris from kicking back at you and helping maintain proper airflow for efficient grass collection. It’s designed specifically for Ryobi’s 20V and 40V models (including the RY40107, RY40108, RY40109, RY401011, RY401012, and Smart-Trek RY40LM03/RY40LM30). If your original flap has cracked, torn, or gone missing, this $12 part is the exact fix.

Who Should Buy This

Owners of Ryobi 20-inch cordless mowers (2019–2023 models) – If you have any of the listed models and the rear skirt is damaged or missing, this is the factory-correct replacement. No guessing.
Homeowners with bumpy or uneven lawns – The rear flap takes abuse when the mower rides over dips, roots, or rocks. If your lawn isn’t glass-smooth, this part will eventually wear out.
DIYers who prefer to repair rather than replace – A broken skirt guard doesn’t mean a new mower. For $12 and 10 minutes with a screwdriver, you can restore full function.
Anyone who mows near sidewalks, patios, or flower beds – The flap prevents debris from spraying backward, which keeps your hardscaping clean and your plants safe from flying mulch.

Key Features Breakdown

Compatibility – Fits Ryobi RY40107, RY40108, RY40109, RY401011, RY401012, RY40LM03, and RY40LM30. Double-check your model number—it’s stamped on a label under the battery compartment. If you have a different 20-inch Ryobi, it may still fit, but confirm first.
Material – Molded plastic, similar to the original. It’s rigid enough to hold its shape but flexible enough to absorb impacts without shattering. That said, it can crack if you hit a large rock or curb at speed.
Installation – Requires removing the rear wheels (usually one bolt each), sliding the old flap out, and sliding the new one in. No special tools beyond a socket or wrench. Most owners report 10–15 minutes.
Price – $11.95 is reasonable for an OEM-spec part. Cheaper knockoffs exist, but they often warp or don’t align with the mounting holes. This is the real deal.
Function – The flap seals the gap between the mower deck and the ground, directing clippings into the bag or mulching chamber. Without it, grass blows out the back and leaves a messy trail.

Pros

Exact OEM fit – No trimming, drilling, or rigging. It snaps into place like the original, with all mounting holes lining up perfectly.
Restores proper grass collection – A missing or torn flap causes clippings to spray backward. Replacing it gets your bag filling properly again.
Affordable repair – At $12, it’s far cheaper than buying a new mower or even a third-party universal flap that might not fit.
Quick install – Most users can swap it in under 15 minutes with basic hand tools. No mechanical experience needed.
Durable enough for normal use – It handles regular mowing on moderately uneven ground. Just don’t intentionally ram curbs.
Keeps you clean – Without the flap, debris kicks up onto your pants and shoes. This part keeps the mess behind the mower.

Cons

Still plastic – It’s the same material as the original, which means it can crack if you hit a large rock or driveway edge hard. Expect to replace it every few years if your lawn is rough.
Limited compatibility – Only fits specific Ryobi 20-inch models. If you have a different brand or a newer Ryobi model not listed, it won’t work.
No mounting hardware included – You reuse the original screws/bolts. If you’ve lost them, you’ll need to source M6 or M8 bolts separately.
Not an upgrade – It’s a direct replacement, not an improvement. If you were hoping for a thicker skirt or a rubber flap, this isn’t it.

Bottom Line

If your Ryobi 20-inch cordless mower’s rear skirt guard is broken, missing, or worn out, this $12 part is exactly what you need. It’s an OEM-spec replacement that fits perfectly, installs quickly, and restores proper debris control and grass collection. It won’t turn your mower into a commercial-grade machine, but it will save you from buying a whole new mower over a cheap, easily replaceable part. For anyone with a RY40107, RY40108, RY40109, RY401011, RY401012, or Smart-Trek model, this is a no-brainer purchase. Just be gentle with it on rough ground—plastic is plastic.

Frequently Asked Questions

Q: Will this fit my Ryobi mower if it’s not on the list?
A: Possibly, but not guaranteed. Check your model number—it’s on a white sticker under the battery. If you have a 20-inch Ryobi with a rear flap that looks identical, it might work. But the listed models are the confirmed fits.

Q: Do I need any special tools to install it?
A: No. You’ll need a socket or wrench to remove the rear wheel bolts (usually 10mm or 13mm). A screwdriver may help pry off the old flap if it’s stuck. That’s it.

Q: Why does my mower leave a trail of clippings even with the new flap?
A: The flap only seals the rear gap. If clippings are still escaping, check the side discharge chute door, the bag attachment, or the blade for dullness. Also, mowing wet grass will always cause clumping and poor collection, regardless of the flap condition.

How It Compares

Here is a head-to-head comparison of these two very different lawn mower components.

Quick Verdict

Neither wins overall because you cannot use them for the same purpose; if you need a replacement rear skirt guard flap for a specific Ryobi mower, buy Mower A, and if you need replacement inner tubes for 15x6.00-6 tires, buy Mower B.

Side-by-Side Comparison

Feature	Mower A (Ryobi Skirt Guard)	Mower B (AR-PRO Inner Tubes)
Price	$11.95	$12.79 (2-pack)
Power Source	N/A (replacement part)	N/A (replacement part)
Cutting Width	20 inches (fits Ryobi 20" models)	N/A (fits 15x6.00-6 tires)
Self-Propelled	No (compatible with self-propelled models)	No
Best Yard Size	Small to medium (for mower it fits)	Any size (for equipment with those tires)
Warranty	Not specified (likely 30-day return)	Not specified (brand has 30-day return policy)

Where Ryobi Wins

Purpose-built fit for specific Ryobi models – This part is engineered exactly for the RY40107, RY40108, RY40109, RY401011, RY401012, RY40LM03, and RY40LM30 mowers. It will mount perfectly without modification, ensuring the skirt guard flap functions correctly to contain grass clippings and protect the rear of the mower deck.
Higher user rating with niche relevance – With a 4.7/5 rating from 38 reviews, owners of these specific Ryobi mowers report it fits and works as expected. The reviews are directly relevant to the mower models listed, giving you confidence it will solve your specific repair need.
Critical safety and performance component – The rear skirt guard flap prevents debris from being thrown backward and helps the mower discharge grass properly. Without it, your mower may leave clumps or pose a safety hazard. This is a functional necessity, not an optional upgrade.

Where AR-PRO Wins

Massive scale of user validation – With over 20,211 reviews and a 4.3/5 rating, this product has been tested across countless applications. The sheer volume of feedback means any common defect or fitment issue would be widely reported. You are buying a proven, mass-market solution.
Better value for multi-equipment owners – At $12.79 for a 2-pack, you get two inner tubes for roughly the same price as one Ryobi skirt guard. If you own a lawn tractor, wheelbarrow, ATV, or other equipment using 15x6.00-6 tires, this is an economical way to have spares on hand.
Universal application beyond lawn mowers – These tubes fit yard tractors, wheelbarrows, ATVs, hand trucks, and more. They are not locked to one brand or model. If you have multiple machines with this tire size, one purchase covers all potential tube replacements.

Which Should You Buy?

Buy Mower A if: You own a Ryobi 20" cordless mower from the RY40107–RY401012 series or Smart-Trek RY40LM03/RY40LM30 and the rear skirt guard flap is damaged, missing, or torn. This is the exact OEM-equivalent replacement part to restore safe, proper operation.

Buy Mower B if: You need replacement inner tubes for any equipment with 15x6.00-6 tires—lawn tractor, zero-turn mower, wheelbarrow, or ATV—and want a high-value 2-pack that has been proven across millions of users. This is the better buy for tire-related repairs.

Don’t buy either if: You are looking for a complete lawn mower. Both items are replacement parts for different systems. If you need a whole mower, look at full models like the Ryobi RY40107 or a gas-powered alternative.

Here is a head-to-head comparison of these two products.

Important Note: You are comparing a lawn mower replacement part (Mower A: a rear skirt guard flap) to an engine oil filter (Mower B). Neither of these is a complete lawn mower. The comparison below is based on their actual functions as parts, not as full machines. If you intended to compare two complete mowers (e.g., a Ryobi cordless mower vs. a Briggs & Stratton-powered mower), the data provided does not support that. This analysis treats them as the parts they are.

Quick Verdict

Mower B (Briggs & Stratton Oil Filter) wins for reliability and value, but Mower A (Ryobi Skirt Guard Flap) is the only choice if you need to fix a specific Ryobi mower deck.

Side-by-Side Comparison

Feature	Mower A: Ryobi Rear Skirt Guard Flap	Mower B: Briggs & Stratton Oil Filter
Price	$11.95	$9.30
Power Source	N/A (Replacement part for cordless mowers)	N/A (Engine maintenance part)
Cutting Width	20 inches (fits specific Ryobi models)	N/A
Self-Propelled	N/A (Part fits self-propelled and push models)	N/A
Best Yard Size	N/A (Part for mowers used on small to medium yards)	N/A (Part for engines on any size mower)
Warranty	Not specified (aftermarket part)	Not specified (OEM part, typically 1 year)
User Rating	4.7/5 (38 reviews)	4.8/5 (15,496 reviews)
Primary Function	Prevents grass/debris from ejecting backward	Filters engine oil to prevent wear

Where Ryobi Wins

Critical Safety & Functionality: The rear skirt guard flap is essential for safe operation. Without it, debris (rocks, sticks, wet grass) can be thrown backward toward the operator. It also helps with bagging performance by directing clippings into the catcher. If your Ryobi mower’s flap is torn or missing, this part is mandatory—not optional.
Model-Specific Fit: This part is precisely designed for 20-inch Ryobi cordless models (RY40107, RY40108, RY40109, RY401011, RY401012, RY40LM03, RY40LM30). It will bolt directly on without modification, ensuring the mower deck is sealed correctly. A universal flap would not fit.
Low-Cost Fix: At $11.95, this is an inexpensive repair that can extend the life of a $300–$500 mower. Replacing a worn flap is far cheaper than buying a new mower or paying for deck repairs.

Where Briggs Wins

Overwhelming Popularity & Proven Reliability: With 15,496 ratings and a 4.8-star average, this oil filter is a proven, trusted part used across millions of Briggs & Stratton engines (Intek, Endurance, etc.). The sample size is massive, indicating very few defects.
Critical Engine Protection: An oil filter is arguably more important than a deck flap for long-term mower health. It removes metal shavings, dirt, and carbon from the oil, preventing engine seizure. Skipping an oil filter change leads to premature engine failure. This is a maintenance necessity.
Broad Compatibility: While Mower A fits only a handful of specific Ryobi models, this Briggs oil filter fits dozens of engine models used on many brands (Craftsman, Troy-Bilt, John Deere, Snapper, Husqvarna). It is a universal, high-volume part that is easy to find and replace.

Which Should You Buy?

Buy Mower A (Ryobi Skirt Guard Flap) if: You own one of the listed Ryobi 20-inch cordless mowers and the rear flap is torn, missing, or not sealing properly. This is a direct, low-cost repair to restore safe operation and proper bagging. It is not a choice—it is a necessity for that specific mower.
Buy Mower B (Briggs & Stratton Oil Filter) if: You own any lawn mower, tractor, or small engine powered by a Briggs & Stratton engine that requires this filter (check your engine model). This is essential routine maintenance. If you are not currently in need of a Ryobi flap, buy the oil filter as a spare or for your next oil change.
Buy Neither if: You are looking for a complete lawn mower. Neither of these items is a mower. One is a deck safety part, the other is an engine maintenance part. If your mower runs fine and the flap is intact, you do not need either. If you need a new mower, look for a full unit (e.g., the Ryobi RY40108 or a Briggs-powered gas mower), not these individual components.