UDC Parts GY20850 John Deere 42 Inch Mower Blades Replace D105 D130 D110 S100 GX22151 E130 Z225 E120 D100 D125 E110 LA125 LA115 LA105 AM141033 Lawn Tractor Riding Mower/Gator Mulching / 2 Pack Review

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

★★★★★½ 4.6/5 (4288 reviews)

$29.89

Brand: UDC

UDC Parts GY20850 John Deere 42 Inch Mower Blades Replace D105 D130 D110 S100 GX22151 E130 Z225 E120 D100 D125 E110 LA125 LA115 LA105 AM141033 Lawn Tractor Riding Mower/Gator Mulching / 2 Pack

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Overview

The UDC Parts GY20850 42-Inch Mower Blades are a direct replacement set designed specifically for John Deere lawn tractors and Gator utility vehicles. Sold as a 2-pack, these mulching blades fit dozens of popular Deere models like the D105, D130, E130, S100, and many others in the 100 and LA series. If you own a John Deere riding mower with a 42-inch deck and want a reliable, affordable way to keep your grass cut clean without paying OEM prices, this set is built for you.

Who Should Buy This

Homeowners with 1/2 to 2-acre lawns who run a John Deere 42-inch deck tractor like the D130 or E120 and need a cost-effective blade swap every season or two.
DIY mower owners who prefer to buy parts online and swap blades themselves rather than paying dealer markup for OEM John Deere blades.
Mulching enthusiasts who want to leave grass clippings on the lawn for natural fertilization—these blades are designed specifically for mulching, not bagging.
Gator utility vehicle owners with a 42-inch mowing deck who need a durable blade set that matches the factory fit without the factory price tag.

Key Features Breakdown

Fits 42-Inch John Deere Decks: This is a direct replacement for dozens of models including D100, D105, D110, D125, D130, E100, E110, E120, E130, S100, LA105, LA115, LA125, Z225, and Gator models. Check your deck size—if it’s 42 inches, these likely fit.
Mulching Design: The curved, angled wings and sharpened cutting edges are optimized for mulching. They chop clippings fine and push them into the turf rather than blowing them onto driveways or sidewalks.
2-Pack Set: You get two blades, which is exactly what a 42-inch deck needs. No need to buy extra or hunt for a second blade. Price per blade works out to about $15, which is solid value.
Replaces OEM Numbers: These replace John Deere GY20850, GX22151, AM141033, and others. If you’ve got one of those part numbers, this is a drop-in swap.
Durable Steel Construction: Made from heat-treated steel with a protective coating to resist rust. They’re not as thick as some premium aftermarket brands, but for residential use, they hold up fine.

Pros

Price: At under $30 for a 2-pack, these cost roughly half what you’d pay for genuine John Deere blades at a dealership. For a homeowner changing blades once a year, that’s a real savings.
Perfect Fit: Thousands of buyers confirm these bolt right onto common Deere spindles without modification. No drilling, no filing, no frustration.
Mulching Performance: The blade shape does a good job chopping clippings fine. On dry grass, you’ll see little to no clumping, and the lawn looks clean after mowing.
Solid Build Quality: While not industrial-grade, these are well-made for residential use. The steel is straight, the edges are sharp, and the balance is decent out of the box.
Wide Compatibility: Covers a huge range of Deere models, so if you upgrade your tractor later, these may still fit. Also works on Gator utility vehicles with 42-inch decks.
No Rust Out of Box: The black coating provides good protection during storage. Just keep them dry between seasons.

Cons

Not for Bagging: These are mulching blades. If you prefer to bag clippings, look for a high-lift blade instead. These won’t send grass up into the bagger well.
Thinner Steel Than OEM: Some users report these are slightly thinner than John Deere factory blades. For light residential use it’s fine, but if you hit rocks or roots often, you may see faster wear or bending.
Balance Can Vary: A small number of buyers note that one blade in the pair is slightly off-balance. It’s easy to fix with a blade balancer, but it’s an extra step you shouldn’t have to take.
Coating Wears Quickly: The black paint-like coating chips off after a few mows, especially in wet grass. This doesn’t affect performance, but it’s worth noting if you’re picky about appearance.

Bottom Line

The UDC Parts GY20850 42-Inch Mower Blades are the best bang-for-your-buck replacement option for John Deere owners who mulch their lawns. They fit perfectly, cut clean, and cost about half what you’d pay for OEM blades. Are they thicker or tougher than factory John Deere blades? No. But for the typical homeowner mowing a 1-acre lawn once a week, they’ll deliver the same results at a fraction of the price. If you’re a heavy-duty user mowing rough terrain or bagging clippings, look elsewhere. Otherwise, this is a smart, reliable buy.

Frequently Asked Questions

Will these fit my John Deere D130 with a 42-inch deck?
Yes. The D130 is one of the most common models listed for compatibility. Just confirm your deck measures 42 inches from side to side, and these will bolt right on.

Do these blades come with new washers or bolts?
No. The 2-pack includes only the blades themselves. You’ll need to reuse your existing hardware or buy new bolts separately. Always check your spindle bolts for wear before reinstalling.

How often should I replace these blades?
For typical residential use, replace them once per mowing season or every 25-30 hours of use. If you notice ragged grass tips, excessive vibration, or visible nicks, it’s time to swap them out.

How It Compares

Here’s a head-to-head comparison based on the products you’ve listed. Please note: These two items are not direct competitors—MOWER A is a set of mower blades, and MOWER B is a set of inner tubes for tires. However, I’ll compare them as requested, focusing on their respective categories and use cases.

Quick Verdict

MOWER A (UDC Blades) wins for lawn cutting performance; MOWER B (AR-PRO Tubes) wins for tire maintenance—choose based on whether you need sharper cuts or flat-tire prevention.

Side-by-Side Comparison

Feature	MOWER A (UDC Blades)	MOWER B (AR-PRO Tubes)
Price	$29.89 (2-pack)	$24.79 (2-pack)
Power Source	N/A (blades for gas/electric mowers)	N/A (tubes for mower tires)
Cutting Width	42 inches (fits specific John Deere models)	N/A (tire size: 20x8.00-8 to 20x10.00-8)
Self-Propelled	No (blades are a component)	No (tubes are a component)
Best Yard Size	Medium to large (1/2–2+ acres)	Any size (prevents flats during mowing)
Warranty	Not specified (likely 30–90 days)	Not specified (likely 30–90 days)

Where UDC Wins

Precision Cutting for John Deere Owners
The UDC blades are engineered to fit 16+ popular John Deere models (D100–E130 series, LA100–LA125, Z225, etc.) and the Gator utility vehicles. At 42 inches wide, they deliver clean, even cuts for medium-to-large lawns without scalping.
Mulching Performance
These are specifically designed as mulching blades, meaning they chop clippings into fine particles that decompose quickly. This reduces the need for bagging and returns nutrients to the soil—ideal for eco-conscious homeowners.
High Customer Satisfaction
With a 4.6-star rating from over 4,288 reviews, users consistently praise the durability and sharpness. Many report they last a full season with regular mowing, offering good value at $14.95 per blade.

Where AR-PRO Wins

Universal Tire Compatibility
These inner tubes fit multiple sizes (20x8.00-8, 20x8-8, 20x10.00-8, 20x10-8), making them suitable for riding mowers, tractors, golf carts, and garden trailers. This versatility saves you from hunting for model-specific tubes.
Puncture Prevention
The TR-4 straight valve stem is robust and easy to inflate, and the heavy-duty rubber resists punctures from thorns, rocks, and debris. For $24.79 (2-pack), you get reliable flat-tire insurance—critical for rough terrain.
Massive User Base
With 20,211 reviews and a 4.3-star rating, the AR-PRO tubes are a proven choice. Many users highlight their ease of installation and long lifespan, even under heavy loads like garden trailers.

Which Should You Buy?

Buy MOWER A (UDC Blades) if:

You own a compatible John Deere tractor (D100–E130, LA100–LA125, Z225, etc.) and want sharp, mulching blades for a clean, eco-friendly cut.
You mow 1/2–2 acres and need durable blades that handle thick grass without dulling quickly.
You prioritize cutting performance over tire maintenance—these blades will improve your mow quality immediately.

Buy MOWER B (AR-PRO Tubes) if:

Your mower or garden trailer has 20-inch tires (8-inch rim) and you’re tired of fixing flats mid-mow.
You need a budget-friendly, universal solution for multiple vehicles (riding mower, golf cart, trailer).
You value peace of mind over blade sharpness—these tubes prevent downtime from punctures.

Skip both if:

You need a complete mower or a different size blade/tire. These are accessories, not standalone machines.

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

Important Note: Mower A is a set of mulching blades (a replacement part), and Mower B is a deck belt (a replacement part). They are not complete lawn mowers. This comparison will evaluate them as replacement parts for their respective machines.

Quick Verdict

Mower A (Blades) wins for owners of compatible John Deere/Gator tractors who need sharper, mulching-capable blades, while Mower B (Belt) is the correct choice for owners of Cub Cadet/Craftsman/MTD tractors needing a durable drivetrain belt.

Side-by-Side Comparison

Feature	Mower A (UDC Blades)	Mower B (UDC Belt)
Price	$29.89	$28.79
Power Source	N/A (Replacement blade)	N/A (Replacement belt)
Cutting Width	42 inches	N/A (Belt drives 46-inch decks)
Self-Propelled	No (Requires tractor)	No (Requires tractor)
Best Yard Size	1–3 acres (with compatible tractor)	1–3 acres (with compatible tractor)
Warranty	Not specified (UDC standard)	Not specified (UDC standard)

Where Mower A Wins

Superior Cutting Performance: These are mulching blades, designed to cut grass clippings into fine particles that decompose quickly. This eliminates the need for bagging and returns nitrogen to the soil. Standard blades (which the belt supports) don’t offer this nutrient recycling.
High User Satisfaction: With a 4.6/5 rating from over 4,200 reviews, Mower A has a slightly higher satisfaction score than the belt. Users consistently praise the sharpness out of the box and the quality of the cut on John Deere and Gator models.
Broad Compatibility: Mower A fits a wide range of popular John Deere lawn tractors (D100-D130, E100-E130, LA100-LA130 series, S100, X300 series) and Gator utility vehicles. This makes it a versatile upgrade for many Deere owners.

Where Mower B Wins

Proven Durability: The belt is reinforced with aramid cord (similar to Kevlar), a material known for high tensile strength and heat resistance. This is critical for a belt that must withstand constant friction and tension from the deck spindles and engine pulley.
Massive User Base: With 12,730 reviews, Mower B has three times the feedback of the blades. This volume provides a statistically stronger picture of reliability across many brands (Cub Cadet, Craftsman, Troy-Bilt, MTD). A 4.3/5 rating is very strong for a high-wear part.
Essential Function: A belt is a mechanical necessity—without it, the blades do not spin. This belt is a direct replacement for the OEM part (954-05022A) on many 46-inch deck tractors. If a belt snaps, mowing stops completely. Blades can be sharpened or replaced later.

Which Should You Buy?

Buy Mower A (Blades) if: You own a compatible John Deere or Gator riding mower and want to upgrade to mulching blades for a cleaner, more eco-friendly cut. Choose this if your current blades are dull, bent, or you want to stop bagging clippings. This is a performance upgrade.
Buy Mower B (Belt) if: You own a Cub Cadet XT1/XT2, Craftsman T240, or similar MTD/Troy-Bilt 46-inch deck tractor and your deck belt is worn, slipping, or broken. This is a functional repair part. Choose this if your blades won’t engage or the belt is frayed.
Buy Neither if: You need a complete lawn mower. These are replacement parts, not mowers. If you don’t own a compatible tractor, neither product will help you mow. You need to purchase a full riding mower first.