GX20072 John Deere 42 inch Deck Belt Lawn Mower 1/2 x 103 inches GY20570 D100 D105 D110 D120 D125 D130 X110 X125 LA105 E100 E110 E120 Kevlar Cord Review

Name: GX20072 John Deere 42 inch Deck Belt Lawn Mower 1/2 x 103 inches GY20570 D100 D105 D110 D120 D125 D130 X110 X125 LA105 E100 E110 E120 Kevlar Cord
Brand: GX20072
Price: 16.99 USD
Availability: InStock

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

★★★★ 4.3/5 (109 reviews)

$16.99

Brand: GX20072

GX20072 John Deere 42 inch Deck Belt Lawn Mower 1/2 x 103 inches GY20570 D100 D105 D110 D120 D125 D130 X110 X125 LA105 E100 E110 E120 Kevlar Cord

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Overview

The GX20072 is a 42-inch deck belt designed for John Deere lawn tractors, measuring 1/2 inch wide by 103 inches long. It’s built for owners of popular D100, X100, and E100 series mowers who need a reliable replacement belt that won’t snap mid-season. This belt is reinforced with Kevlar cord, which gives it a serious edge over cheaper rubber-only belts.

Who Should Buy This

Owners of John Deere D100, D105, D110, D120, D125, D130, X110, X125, LA105, E100, E110, or E120 tractors – This is the exact OEM-spec belt for these models, so it’s a direct drop-in replacement.
Homeowners with 1–2 acre lawns – If you’re mowing a half-acre to two acres weekly, this belt’s Kevlar reinforcement handles the constant load without stretching or fraying quickly.
Budget-conscious DIYers – At $16.99, it’s significantly cheaper than a dealership belt, but still uses quality materials. Perfect if you change your own belts and want to save money.
Anyone tired of snapping belts mid-mow – If you’ve had a cheap belt shred on a wet, heavy patch of grass, the Kevlar cord here offers real peace of mind.

Key Features Breakdown

Kevlar Cord Reinforcement – This isn’t just marketing fluff. Kevlar fibers run through the belt’s tensile cords, giving it higher strength and heat resistance than standard rubber or polyester belts. That means it’s less likely to stretch, crack, or snap when you’re cutting thick St. Augustine or dealing with damp grass.

1/2 x 103 Inch Dimensions – The width (1/2 inch) and length (103 inches) match John Deere’s OEM spec for 42-inch deck mowers. Don’t try to use a 100-inch belt on these decks—it won’t tension properly and will slip. This belt fits correctly out of the box.

Compatible with 14+ John Deere Models – The GX20072 replaces OEM part numbers GY20570, GX20072, and others. It fits D100 through D130 series, X110 and X125, LA105, and E100 through E120. Always double-check your model number, but this covers the vast majority of 42-inch Deere decks from the last 10–15 years.

Price at $16.99 – For a Kevlar-reinforced belt from a reputable aftermarket brand, this is a solid deal. OEM John Deere belts often run $30–$40 at dealers. You’re getting similar durability for half the cost.

Rated 4.3 out of 5 Stars – With 109 reviews, the average rating shows most buyers are satisfied. The few lower ratings typically cite belt length variance or installation difficulty, which we’ll cover in Cons.

Pros

Kevlar cord construction – Genuinely tougher than standard belts. Handles heavy grass and occasional debris strikes better.
Direct fit for many John Deere models – No modifications needed on D100, E100, X100 series with 42-inch decks.
Affordable price – At $16.99, it’s a fraction of dealer cost without sacrificing quality.
Good heat resistance – Kevlar doesn’t degrade as fast under the heat generated by a spinning deck pulley system.
Consistent tension – Users report less stretching over a season compared to no-name belts, meaning fewer adjustments.
Widely reviewed – Over 100 ratings give you a realistic sense of what to expect. The 4.3 average is trustworthy.

Cons

Length can vary slightly – A handful of buyers report the belt being a half-inch shorter or longer than spec. On some decks, this makes installation tight or requires adjusting the tensioner arm to its limit.
Not genuine John Deere – If you’re a stickler for OEM parts or still under warranty, this aftermarket belt might not satisfy you. It’s a quality alternative, but it’s not a green-and-yellow box.
Installation can be tricky – Routing a 103-inch belt around three pulleys and a tensioner is fiddly, especially on D100 series decks. You’ll need a wrench and maybe a second pair of hands.
No installation instructions included – The belt comes in a plastic bag with no diagram. If you’re new to belt changes, you’ll need to search online for your model’s belt path.

Bottom Line

If you own a John Deere D100, E100, or X100 series tractor with a 42-inch deck and need a replacement belt that won’t break the bank, the GX20072 is a smart buy. The Kevlar cord gives it genuine durability over cheap belts, and the price is hard to beat. Just be prepared for a snug fit on some models, and double-check your belt routing before you button everything up. For the money, it’s one of the best aftermarket options for these popular Deere decks.

Frequently Asked Questions

Q: Will this belt fit my John Deere D125? A: Yes, the D125 uses a 42-inch deck and takes the GX20072 or GY20570 belt. Just make sure your mower has the 42-inch cutting deck, not the 48-inch version—those use a different belt length.

Q: How long does this belt typically last? A: With normal residential use (mowing 1–2 acres weekly), expect 2–3 seasons. The Kevlar reinforcement helps it resist stretching and cracking longer than standard belts. If you hit rocks or sticks often, it may wear faster.

Q: Is it hard to install this belt myself? A: It’s moderate difficulty—doable in 20–30 minutes if you’re handy. You’ll need to remove the deck or at least access the pulleys from underneath. Watch a YouTube video for your specific model first. The belt is stiff when new, so be patient routing it around the tensioner pulley.

How It Compares

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

Quick Verdict

Neither “wins” overall because they are not comparable products – the GX20072 is a lawn mower drive belt, while the AR-PRO is a set of inner tubes for tires; your choice depends entirely on whether you need a replacement belt for a John Deere mower or replacement tubes for mower/tractor tires.

Side-by-Side Comparison

Feature	GX20072 (Belt)	AR-PRO (Inner Tubes)
Price	$16.99	$24.79 (for 2-pack)
Power Source	N/A (mechanical belt)	N/A (tire accessory)
“Cutting Width”	42 inches (deck belt length)	20x8-8 / 20x10-8 (tire size)
Self-Propelled	No (belt drives blades, not wheels)	No
Best Yard Size	Any size John Deere with a 42" deck	Any yard with pneumatic tires needing tubes
Warranty	Not specified (typically 90-day on parts)	Not specified (typically 30-day on tubes)

Where GX20072 Wins

Exact Fit for John Deere 42" Decks – This belt is specifically designed for John Deere models D100, D105, D110, D120, D125, D130, X110, X125, LA105, E100, E110, E120, and more. It replaces OEM part numbers GX20072 and GY20570, ensuring no guesswork or modification needed for a clean installation on these popular lawn tractors.
Kevlar Cord Construction – Unlike standard rubber belts that stretch and crack over time, this belt uses Kevlar cords. This provides superior tensile strength and heat resistance, meaning it will last significantly longer under the constant stress of spinning mower blades, especially in tall, wet, or thick grass.
Lower Price for a Critical Component – At $16.99, it’s a very affordable fix for a mower that won’t cut. A snapped or worn deck belt renders a riding mower completely useless for mowing. This belt restores full functionality at a fraction of the cost of a new mower or a dealer service call.

Where AR-PRO Wins

Massive Versatility – These 20x8.00-8 / 20x10.00-8 inner tubes fit a wide range of equipment beyond lawn mowers: garden tractors, zero-turn mowers, golf carts, garden trailers, wheelbarrows, and even some ATVs. The 2-pack gives you a spare or allows you to replace both tires on an axle at once.
Overwhelmingly Proven Reliability – With over 20,211 reviews and a 4.3-star rating, this product has been purchased and tested by tens of thousands of users. This massive sample size indicates consistent quality, good rubber thickness, and reliable valve stems that hold air over multiple seasons.
Solves a Common, Frustrating Problem – A flat tire from a thorn or pinch flat is one of the most common issues with lawn equipment. These tubes allow you to repair a tire in minutes rather than buying a whole new tire or wheel assembly. The TR-4 straight valve stem is standard and easy to air up with any pump or compressor.

Which Should You Buy?

Buy the GX20072 (belt) if:

Your John Deere mower’s blades won’t spin because the deck belt is broken, stretched, or slipping.
You own one of the listed models (D100–D130, X110, LA105, E-series, etc.) and want a direct OEM-replacement part.
You need a high-strength Kevlar belt that can handle heavy cutting conditions without premature failure.

Buy the AR-PRO (inner tubes) if:

You have a flat tire on a mower, tractor, golf cart, or trailer that uses 20x8-8 or 20x10-8 tires and the tire itself is still in good condition.
You want a spare set of tubes on hand for quick repairs during mowing season without a trip to the store.
You need a proven, affordable solution for multiple pieces of equipment (one pack covers two tires, saving you money over buying singles).

Buy neither if:

You need a complete mower. Both products are replacement parts, not functioning lawn mowers. If your mower is missing an engine or deck, you need a different product entirely.

Here is a head-to-head comparison of the two products you listed. Please note that Mower A (John Deere GX20072) is a replacement belt, not a complete lawn mower, and Mower B (AR-PRO) is a set of inner tubes, not a mower. This comparison will treat them as the specific parts they are, not as full mowers.

Quick Verdict

The AR-PRO inner tubes win for sheer universal utility and value, but the John Deere belt is the better choice if you need a specific, durable repair part for a late-model John Deere tractor.

Side-by-Side Comparison

Feature	Mower A: John Deere GX20072 Belt	Mower B: AR-PRO 15x6.00-6 Inner Tubes
Price	$16.99 (single belt)	$12.79 (2-pack of tubes)
Power Source	N/A (engine-driven accessory)	N/A (passive tire component)
Cutting Width	42 inches (deck belt application)	N/A (fits 15x6.00-6 tires)
Self-Propelled	No (requires tractor drive)	No (passive tire component)
Best Yard Size	N/A (repair part for any size yard)	N/A (repair part for any size yard)
Warranty	Not specified (typically 90 days–1 year)	Not specified (typically 30–90 days)

Where GX20072 Wins

OEM Fit and Material: This is a genuine John Deere / OEM-spec belt (GX20072 / GY20570) made with Kevlar cord. It is engineered specifically for dozens of John Deere models (D100–D130, X110–X125, E100–E130, LA105). You get exact deck alignment and tension, which aftermarket belts often fail to match.
Proven Reliability for Specific Models: With a 4.3-star rating from 109 reviews, users confirm it fits perfectly on the listed models. If you own a D125 or E120, this belt eliminates guesswork—no trimming, no slipping, no premature snapping.
Critical Safety and Performance: A deck belt drives the blades. A Kevlar-corded OEM belt resists heat buildup and fraying better than generic rubber belts. This means cleaner cuts and less risk of belt failure mid-mow, which can damage the spindle or deck.

Where AR-PRO Wins

Massive Value and Quantity: For $12.79, you get two tubes—roughly $6.40 each. This is cheaper than most single tubes at hardware stores. It’s a no-brainer if you have multiple machines (tractor, wheelbarrow, ATV) or need a spare.
Universal Fit Across Many Machines: The 15x6.00-6 size with a TR-13 straight valve stem is one of the most common lawn tractor tire sizes. It fits John Deere, Cub Cadet, Husqvarna, Craftsman, and even wheelbarrows and small trailers. Its 20,211 reviews (4.3 stars) confirm broad compatibility.
Immediate Problem Solver: A flat tire stops a mower instantly. Tubes are a quick fix—no need to replace the whole tire. The TR-13 stem is standard for most lawn tractor rims, making installation straightforward. This product is a practical, low-cost solution for a very common breakdown.

Which Should You Buy?

Buy Mower A (John Deere GX20072 Belt) if: You own one of the listed John Deere models (D100–D130, X110–X125, E100–E130) and your deck belt is worn, cracked, or snapped. You want a direct OEM replacement with Kevlar durability and no fitment risk. This is a repair, not an upgrade.
Buy Mower B (AR-PRO Inner Tubes) if: You have a flat tire on any 15x6.00-6 tire (lawn tractor, wheelbarrow, ATV) or want to prevent flats on a machine you use frequently. The 2-pack is ideal for replacing both front tires or keeping a spare on hand for emergencies.
Buy Neither if: You are looking for a complete lawn mower. Neither product is a mower. The John Deere belt is a specific repair part; the AR-PRO tubes are a universal tire repair item. If you need a new machine, look for a full mower listing.