490-100-0111 490-100-0008 16-Inch Detatching Replacement Mower Blade w/Mounting Hardware for Arn-Old Ryobi Craftsman Lawn Mower, Replace 490-100-0012 645-80116A Review

Name: 490-100-0111 490-100-0008 16-Inch Detatching Replacement Mower Blade w/Mounting Hardware for Arn-Old Ryobi Craftsman Lawn Mower, Replace 490-100-0012 645-80116A
Brand: Ryobi
Price: 21.99 USD
Availability: InStock

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

★★★★½ 3.6/5 (21 reviews)

$21.99

Brand: Ryobi

490-100-0111 490-100-0008 16-Inch Detatching Replacement Mower Blade w/Mounting Hardware for Arn-Old Ryobi Craftsman Lawn Mower, Replace 490-100-0012 645-80116A

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Overview

This isn’t a mower—it’s a specific replacement part. The 490-100-0111 / 490-100-0008 is a 16-inch dethatching blade designed for older Ryobi and Craftsman walk-behind mowers, often replacing part numbers 490-100-0012 and 645-80116A. It’s for homeowners who already own a compatible mower and want to switch from mulching or bagging to dethatching, or who need a fresh blade for spring lawn renovation. Think of it as a tool for reviving a tired lawn, not for daily mowing.

Who Should Buy This

Homeowners with older Ryobi or Craftsman mowers – If your mower’s manual lists 490-100-0012 or 645-80116A as a compatible blade, this is a direct drop-in replacement. It saves you from hunting down discontinued parts.
Lawn enthusiasts who dethatch annually – If you prefer a mechanical dethatcher over renting a power rake, this blade lets you use your existing mower for the job. Best for lawns with moderate thatch buildup (under 1/2 inch).
Budget-conscious DIYers – At $21.99, this is cheaper than buying a dedicated dethatcher or paying for a professional service. It’s a low-cost way to improve lawn health if you already own the mower.
Homeowners with 1/4 to 1/2 acre lawns – The 16-inch width is efficient for smaller yards but will feel slow on larger properties. It’s a good match for typical suburban lots.

Key Features Breakdown

16-inch cutting width: Standard for this class. It balances maneuverability in tight spots with decent coverage. Expect to make more passes than with a 21-inch blade, but it’s fine for average-sized lawns.
Dethatching design: The blade has offset, curved fingers that rake up dead grass and moss without scalping the soil. It’s not a mulching blade—it’s meant to lift and remove thatch, not chop it fine.
Includes mounting hardware: You get the blade, a bolt, and a washer. No need to buy extra parts. Just check your mower’s spindle size—most Ryobi models use a 5/8-inch center hole, but verify.
Replaces multiple part numbers: Compatible with 490-100-0012 and 645-80116A, among others. This is helpful if you’ve inherited a mower and the original blade number has worn off.
Steel construction: Basic but durable for occasional dethatching. It’s not heavy-duty enough for commercial use, but for a homeowner doing this once or twice a year, it holds up fine.

Pros

Direct fit for common models – Works with many Ryobi and Craftsman mowers from the 2000s and 2010s. No modification or adapter needed.
Budget-friendly dethatching – Cheaper than renting a dethatcher or buying a separate tool. If you already own the mower, this is a $22 upgrade.
Includes mounting hardware – The bolt and washer are included, so you don’t have to hunt for them. Just wrench it on.
Lifts thatch effectively – The finger design pulls up dead grass without tearing up healthy roots. Works best on dry, short grass.
Lightweight and easy to install – Weighs under a pound. You can swap blades in under 10 minutes with a socket wrench.
Good for spring preparation – Use it before fertilizing or overseeding to open up the soil surface. It’s a solid prep step for lawn renovation.

Cons

Not for heavy thatch – If your lawn has more than 1/2 inch of thatch, this blade will struggle. You’ll need a power rake or core aerator for thick buildup.
Doesn’t bag or mulch – This is strictly a dethatching blade. You’ll need to rake up the debris afterward. It doesn’t collect clippings.
Compatibility is hit-or-miss – Despite the long list of replacement numbers, some users report that the center hole is slightly off for certain Craftsman models. Measure your spindle before buying.
Average durability – The steel is fine for occasional use, but if you hit rocks or roots, the fingers can bend. Not as tough as a commercial-grade blade.

Bottom Line

The 490-100-0111 / 490-100-0008 is a practical, affordable dethatching blade for homeowners who already own a compatible Ryobi or Craftsman mower and want to tackle thatch without renting equipment. It’s not a miracle worker—if your lawn is severely matted, you’ll need heavier tools—but for light to moderate thatch, it does the job well. The $21.99 price is fair, especially since it includes hardware. Just double-check your mower’s spindle size and be ready to rake up the debris. I recommend it for DIY lawn care enthusiasts who want a quick, low-cost spring prep option. If you need a blade that also mulches or bags, look elsewhere.

Frequently Asked Questions

Q: Can I use this blade for regular mowing instead of dethatching?
A: Technically yes, but it won’t cut grass cleanly. The fingers are designed to rake, not slice. You’ll get a ragged cut and poor discharge. Stick to dethatching duties only.

Q: Will this fit my Craftsman mower from 2005?
A: It depends on the model. It’s designed for older Craftsman mowers that use a 5/8-inch center hole with a 4.5-inch blade offset. Measure your spindle and compare to the blade’s center hole. If in doubt, check your owner’s manual for part numbers like 645-80116A.

Q: How often should I use a dethatching blade?
A: Once or twice a year, typically in early spring or fall. Overusing it can damage healthy grass. Only dethatch when thatch is over 1/2 inch thick. After use, rake up the debris and water your lawn well.

How It Compares

Head-to-Head Comparison: Ryobi Replacement Blade vs. NOCO Battery Charger

Quick Verdict

Neither “wins” overall because these are entirely different products—one is a lawn mower blade, the other a battery charger—so the choice depends entirely on whether you need a mower part or a battery maintenance tool.

Side-by-Side Comparison

Feature	Mower A (Ryobi Blade)	Mower B (NOCO Genius1)
Price	$21.99	$29.95
Power Source	Manual (fits gas mowers)	120V AC outlet
Cutting Width	16 inches	N/A
Self-Propelled	No (blade only)	No
Best Yard Size	Small to medium (up to ¼ acre)	N/A (charger for batteries)
Warranty	Not specified	3 years

Where Ryobi Wins

Direct mower function: This blade is designed specifically for 16-inch Ryobi, Craftsman, and Arnold mowers, allowing you to cut grass—the primary purpose of a lawn mower. The NOCO charger cannot cut grass.
Low cost for repair: At $21.99, this replacement blade is significantly cheaper than buying a new mower. It includes mounting hardware, so you can restore a non-cutting mower to working order for under $25.
Simple installation: The blade is a direct OEM replacement for models 490-100-0012 and 645-80116A, meaning no modifications or adapters are needed. It’s a straightforward swap for anyone comfortable with basic tools.

Where NOCO Wins

Versatility across devices: The NOCO Genius1 charges and maintains 6V and 12V lead-acid, AGM, gel, and lithium batteries. It works on cars, motorcycles, lawn tractors, boats, and more—far more useful than a single mower blade.
Proven reliability: With 62,222 reviews and a 4.4/5 rating, the NOCO has been tested and trusted by an enormous user base. The Ryobi blade has only 21 reviews and a lower 3.6/5 rating, suggesting quality or fitment issues.
Smart features: The NOCO includes automatic overcharge protection, temperature compensation, and desulfation technology. It can maintain batteries for months without damage, while the Ryobi blade simply wears down with use.

Which Should You Buy?

Buy Mower A if: You own a compatible 16-inch Ryobi, Craftsman, or Arnold mower and the blade is dull, damaged, or missing. This is the cheapest way to restore cutting performance without buying a new mower. However, check your specific model compatibility carefully—the low rating suggests fitment may not be universal.

Buy Mower B if: You have any vehicle or equipment with a lead-acid or lithium battery that needs charging, maintaining, or desulfating. This includes lawn tractors, cars, motorcycles, boats, RVs, and even classic cars stored over winter. The NOCO Genius1 is one of the best-selling battery chargers for good reason—it’s reliable, safe, and versatile.

Buy Neither if: You don’t need a replacement blade or a battery charger. If your mower works fine, save your money. If you need a new mower entirely, neither product will help—look for a complete mower instead of just a blade or charger.

Bottom line: These products serve completely different purposes. The Ryobi blade is a niche replacement part for a specific mower model; the NOCO charger is a versatile tool useful for nearly every household with vehicles or power equipment. For most buyers, the NOCO Genius1 offers far more value and utility.

Here is a head-to-head comparison of the two products you’ve listed.

Important Clarification: These are not both lawn mowers. Mower A is a replacement blade for a lawn mower, and Mower B is a set of inner tubes for tires. A direct “mower vs. mower” comparison is impossible because they serve completely different purposes. The comparison below will evaluate them based on the quality and value of what they actually are.

Quick Verdict

Mower B (AR-PRO inner tubes) wins overall due to vastly superior customer satisfaction (4.3 stars from 20,211 reviews) and a clear, reliable function, while Mower A is a niche replacement part with mixed reviews and limited appeal.

Side-by-Side Comparison

Feature	Mower A: Replacement Blade	Mower B: Inner Tube Set
Price	$21.99	$24.79
Primary Function	Cutting grass (replacement part)	Inflating tires (replacement part)
Power Source	N/A (passive blade)	N/A (passive tube)
Cutting Width	16 inches (blade length)	N/A
Self-Propelled	No	No
Best Use Case	Repairing old 16" Ryobi/Craftsman mowers	Maintaining tires on mowers, tractors, or carts
Warranty	Not specified (likely 30-90 day return)	Not specified (but high volume suggests trust)
Customer Rating	3.6 / 5 (21 reviews)	4.3 / 5 (20,211 reviews)

Where Mower A Wins (Ryobi/Craftsman Blade)

Exact Fit for Older Mowers: If you own a specific old-model Ryobi or Craftsman mower that uses the 490-100-0012 or 645-80116A blade pattern, this is a direct OEM-style replacement. It includes mounting hardware, saving you a trip to the hardware store.
Lower Initial Cost: At $21.99, it is $2.80 cheaper than the AR-PRO tubes. For someone on a very tight budget who just needs one blade, this is the lower upfront investment.
Single-Item Convenience: You only need one blade. The AR-PRO product is a 2-pack of tubes, which may be excessive if you only need one tube (though you can save the spare).

Where Mower B Wins (AR-PRO Inner Tubes)

Proven Reliability: With 20,211 reviews and a 4.3-star average, this product has been tested by thousands of users. It is a known, trusted commodity for tire repair. Mower A has only 21 reviews and a mediocre 3.6 rating.
Versatile Sizing: The tubes fit four common tire sizes (20x8.00-8, 20x8-8, 20x10.00-8, 20x10-8). This means they work not only on lawn mowers but also on golf carts, garden trailers, wheelbarrows, and some tractors. Mower A fits only one specific blade pattern.
Better Value per Unit: At $24.79 for a 2-pack, each tube costs roughly $12.40. Mower A costs $21.99 for a single blade. If you need two tubes, the AR-PRO set offers significantly better value.

Which Should You Buy?

Buy Mower A (the blade) if:

You have a broken or dull 16-inch blade on an older Ryobi or Craftsman mower that uses the 490-100-0012 pattern.
You want a direct replacement with the correct mounting hardware included, and you are not concerned about the low review count.
You only need one part and do not want to buy a two-pack of tubes you won’t use.

Buy Mower B (the inner tubes) if:

You have a flat tire on a lawn mower, garden cart, golf cart, or tractor that uses a 20-inch wheel (8-inch rim).
You want a highly-rated, proven product from a seller with tens of thousands of satisfied customers.
You need two tubes (e.g., for a two-wheeled trailer or to keep a spare) and want the best cost-per-unit.

Buy Neither if: