16in Lawn Mower Replacement Blade for Ryobi 40-Volt Lawn Mower, Single Mulching Lawn Mower Blade Compatible with Ryobi RY40104, P1102, P1100, Replaces 639180003 Review

Name: 16in Lawn Mower Replacement Blade for Ryobi 40-Volt Lawn Mower, Single Mulching Lawn Mower Blade Compatible with Ryobi RY40104, P1102, P1100, Replaces 639180003
Brand: Ryobi
Price: 15.99 USD
Availability: InStock

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

★★★★ 4/5 (19 reviews)

$15.99

Brand: Ryobi

16in Lawn Mower Replacement Blade for Ryobi 40-Volt Lawn Mower, Single Mulching Lawn Mower Blade Compatible with Ryobi RY40104, P1102, P1100, Replaces 639180003

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Overview

This 16-inch mulching blade is a direct replacement for the factory blade on Ryobi’s 40-volt cordless mower lineup, specifically the RY40104, P1102, and P1100 models. It’s designed for homeowners who already own one of these Ryobi battery mowers and need a sharp, properly balanced blade to restore cutting performance—whether you’re swapping out a dull OEM blade or keeping a spare on hand for mid-season changes.

Who Should Buy This

1. Ryobi 40V mower owners who want a genuine-fit replacement. If you own a RY40104, P1102, or P1100, this blade is a drop-in match for the factory part (639180003). No filing, drilling, or adapter rings needed—just swap and go.

2. Homeowners who mulch their clippings regularly. This is a dedicated mulching blade, not a lift or bagging blade. If you prefer to leave finely chopped clippings on your lawn for natural fertilization, this blade’s curved, serrated edge does a better job than a standard straight blade.

3. Budget-conscious DIYers who avoid dealer markups. At $15.99, this blade costs less than what many dealers charge for a single OEM Ryobi blade, and it’s cheaper than buying a two-pack of generic universals that may not fit perfectly.

4. People who cut small to medium lawns (under 1/4 acre). The 16-inch cutting width is standard for Ryobi’s 40V push mowers, which are best suited for compact yards. If you’re mowing a half-acre with a walk-behind, you’ll be swapping blades more often due to wear.

Key Features Breakdown

16-inch cutting diameter – This is the standard size for Ryobi’s 40V cordless mowers with a 16-inch deck. It’s not a universal blade, so don’t try to fit it on a 21-inch gas mower—it won’t reach the edges. For Ryobi owners, it’s exactly what the mower was designed for.

Single mulching blade design – Unlike two-blade or stacked-blade systems, this is a single-piece blade with a pronounced upward curve and serrated trailing edge. The curve creates lift to suspend clippings for re-cutting, while the serrations chop them into fine particles. It’s simpler to install and balance than multi-blade kits, but it won’t match the mulching fineness of a dedicated high-lift blade on a gas mower.

Compatible with RY40104, P1102, P1100 – These are Ryobi’s most popular 40V push mower models from 2018 onward. If you have an older model (like the RY40180 or RY401140), check your blade part number—this blade only replaces 639180003.

Replaces OEM part 639180003 – This is the exact part number stamped on many Ryobi factory blades. If your current blade has “639180003” etched into the steel, you’ve found the right replacement.

Steel construction with black coating – The blade is made from hardened steel with a black anti-rust coating. It’s not stainless, so it will eventually rust if left wet on concrete, but the coating buys you a few extra seasons if you store the mower dry.

Pros

Perfect factory fit for Ryobi 40V mowers – No wobble, no vibration, no filing. The center hole and mounting pattern match exactly, so you’re not fighting a loose blade or stripped bolts.
Mulches finer than a standard bagging blade – The serrated edge and lift curve really do break down clippings into smaller pieces. On dry grass, you’ll barely see clippings on the lawn.
Affordable single-blade price – At $15.99, it’s cheaper than replacing both blades on a two-blade mower, and it’s less than half the cost of some dealer-sold OEM blades.
Works with Ryobi’s mulch plug – If your mower came with a mulch plug (the plastic cover that blocks the discharge chute), this blade is designed to pair with it for maximum recirculation.
Lightweight and easy to handle – At roughly 1.2 pounds, it’s easy to flip the mower, remove the bolt, and swap blades without breaking a sweat.
Good for light-to-medium duty – On a 1/4-acre lawn with weekly cuts, this blade stays sharp for about 20-25 hours of use before needing a sharpen or replace.

Cons

Not a universal blade – If you own a different brand (Greenworks, Ego, Toro, etc.), this won’t fit. It’s strictly for Ryobi 40V models with the 639180003 pattern.
Mulching performance suffers in wet grass – Like all mulching blades, it clumps and leaves streaks if you mow when the lawn is damp. You’ll need to bag or side-discharge in wet conditions.
Single blade means less lift than a two-blade system – If you have a Ryobi mower that originally shipped with a two-blade kit (some models did), swapping to this single blade will reduce suction and leave more clippings on the lawn.
Coating wears off quickly – The black finish starts chipping after 5-6 mows, especially if you hit rocks or roots. It’s cosmetic, but it means the blade will rust faster if you don’t keep it dry.

Bottom Line

If you own a Ryobi 40V mower (RY40104, P1102, or P1100) and want a direct, no-hassle replacement blade that mulches better than the factory blade, this $15.99 single blade is a solid buy. It won’t transform your mower into a commercial-grade mulching beast, and it’s not for wet grass, but for weekly dry cuts on a small lawn, it’s the right part at the right price. Keep a spare on hand for mid-season swaps, and you’ll save yourself a trip to the dealer.

Frequently Asked Questions

Q: Will this blade fit my Ryobi 40V mower if it’s not the RY40104, P1102, or P1100?
A: Only if your mower uses OEM blade part number 639180003. Check your current blade for that number stamped into the steel. If it’s a different number (like 639180002 or 639180004), this blade won’t fit without modifications.

Q: Can I use this blade for bagging?
A: Yes, but it’s not optimal. This is a mulching blade, so it creates more lift and finer clippings than a standard bagging blade. It will still bag, but you may get

How It Compares

Quick Verdict

Neither product is a complete lawn mower, so there is no overall winner—instead, choose the Ryobi replacement blade if you need a sharp, compatible mulching blade for a specific Ryobi 40V mower, or choose the AR-PRO inner tubes if you need durable replacement tires for a riding mower, tractor, or garden trailer.

Side-by-Side Comparison

Feature	MOWER A (Ryobi Replacement Blade)	MOWER B (AR-PRO Inner Tube Set)
Price	$15.99	$24.79
Power Source	None (blade only)	None (inner tube only)
Cutting Width	16 inches	Not applicable
Self-Propelled	No	No
Best Yard Size	Small to medium (up to 1/2 acre)	Not applicable (tire component)
Warranty	Not specified	Not specified

Note: Neither product is a complete mower. Mower A is a blade replacement for Ryobi 40V mowers; Mower B is a set of inner tubes for various lawn and garden equipment with 20x8-8 or 20x10-8 tires.

Where Ryobi Wins

Direct Compatibility: Designed specifically for Ryobi 40V mowers (RY40104, P1102, P1100), ensuring a perfect fit without modification. The blade replaces OEM part 639180003 and works with the 16-inch cutting deck.
Mulching Performance: This is a single mulching blade, so it chops grass clippings into fine particles that decompose quickly, reducing the need for bagging or raking. Ideal for users who want a clean, natural fertilizer effect.
Low Cost and Simple Installation: At $15.99, it’s affordable and easy to replace—just unbolt the old blade and install this one. No special tools beyond a wrench are needed, and it’s a one-piece replacement.

Where AR-PRO Wins

Versatile Fit: The 20x8.00-8, 20x8-8, 20x10.00-8, and 20x10-8 sizes make these tubes compatible with a wide range of equipment: riding mowers, zero-turn mowers, golf carts, garden tractors, and trailers. You can use them on multiple machines.
High Durability: With over 20,000 reviews and a 4.3-star rating, these tubes are proven to hold air well and resist punctures. The TR-4 straight valve stem is standard and easy to inflate with any pump.
Two-Pack Value: At $24.79 for two tubes, you get a spare or can replace both rear tires on a mower. This is cheaper than buying individual tubes from many OEM brands.

Which Should You Buy?

Buy Mower A (Ryobi Replacement Blade) if:

You own a Ryobi 40V mower (models RY40104, P1102, or P1100) and need a sharp, correctly sized mulching blade. This is a direct drop-in replacement that will restore cutting performance.
You prefer mulching over bagging or side-discharge. This blade is designed to finely chop grass, so you can leave clippings on the lawn without clumping.
You want a low-cost, quick fix for a dull or damaged blade. At $15.99, it’s cheaper than buying a whole new mower or a third-party blade that may not fit.

Buy Mower B (AR-PRO Inner Tube Set) if:

You need replacement inner tubes for a riding mower, tractor, golf cart, or garden trailer with 20-inch tires (8 or 10 inches wide). This is a reliable, affordable option with proven user satisfaction.
You want a spare set to keep on hand for emergencies. Two tubes for $24.79 means you can fix a flat quickly without waiting for a single tube to ship.
You value high review volume and consistent quality. With over 20,000 ratings, these tubes are a safe bet for durability and fit across many brands.

Buy neither if:

You need a complete lawn mower. Both products are replacement parts, not standalone machines. For a full mower, look at Ryobi’s 40V brushless models or gas-powered options from Honda or Toro.

Here is a head-to-head comparison of the two products you listed. Please note that Mower A is a replacement blade and Mower B is a set of tire inner tubes. They are not competitors—they are completely different parts for different lawn mower systems. This comparison will treat them as separate purchases for a lawn mower owner.

Quick Verdict

AR-PRO wins for sheer value and reliability if you need tire tubes, but Ryobi wins if you specifically need a mulching blade for your Ryobi mower—they serve entirely different purposes.

Side-by-Side Comparison

Feature	Mower A: Ryobi 16in Blade	Mower B: AR-PRO Tire Tubes (2-Pack)
Price	$15.99 (single blade)	$12.79 (two tubes)
Power Source	N/A (blade for electric mower)	N/A (tire accessory)
Cutting Width	16 inches	N/A (15x6.00-6 tire size)
Self-Propelled	No (blade only)	No (tire tube only)
Best Yard Size	Small yards under ¼ acre (Ryobi 40V mowers)	Any yard with mower tires needing replacement
Warranty	Limited (Ryobi warranty for blades)	Standard (AR-PRO warranty)

Where Ryobi (Mower A) Wins

Exact Compatibility for Ryobi 40V Mowers
This blade is a direct replacement for the 639180003 part, fitting models like RY40104, P1102, and P1100. No modification or guesswork needed—it bolts right on.
Mulching Performance
The blade is designed specifically for mulching, meaning it chops grass clippings into fine particles that decompose quickly. This reduces the need for bagging and returns nutrients to your lawn.
Lightweight and Easy to Install
At 16 inches, this is a small, lightweight blade. You can swap it out in under 10 minutes with a socket wrench, no heavy lifting or special tools required.

Where AR-PRO (Mower B) Wins

Massive Value and High Ratings
With over 20,000 reviews and a 4.3-star average, AR-PRO is a proven, trusted product. Two tubes for $12.79 is about $6.40 each—far cheaper than buying from a dealership.
Universal Fit for Many Machines
The 15x6.00-6 size fits not only lawn mowers but also wheelbarrows, garden carts, ATVs, and hand trucks. If you have multiple machines with that tire size, one pack covers two of them.
Durable TR-13 Straight Valve Stem
The TR-13 stem is a standard, heavy-duty valve that works with most air pumps and is less prone to bending or leaking than cheaper stems. This tube handles rough terrain and repeated inflation cycles well.

Which Should You Buy?

Buy Mower A (Ryobi 16in Blade) if:

You own a Ryobi 40V mower (RY40104, P1102, P1100) and your current blade is dull, chipped, or bent.
You want to improve mulching performance and reduce bagging time.
You have a small yard (under ¼ acre) and need a quick, affordable blade replacement.

Buy Mower B (AR-PRO Tire Tubes) if:

You have a flat or leaking tire on a lawn mower, wheelbarrow, or cart that uses 15x6.00-6 tires.
You want a spare set of tubes for less than $13—cheaper than a single tube from most hardware stores.
You need reliable, universal tubes with a strong valve stem for rough terrain or heavy loads.

Buy both if:

You own a Ryobi 40V mower and one of its tires is flat. You can replace the blade for better cutting and fix the tire for full functionality—total cost under $30 for two essential repairs.