I Tested the John Deere LA105 Drive Belt Size: What You Need to Know
When I first started working on my John Deere LA105, I quickly realized how crucial the right drive belt size is for keeping everything running smoothly. The drive belt might seem like a small component, but it plays a vital role in the mower’s performance and longevity. Understanding the correct size and specifications can save you from unexpected breakdowns and ensure your mower operates at its best. Whether you’re a seasoned lawn care enthusiast or just getting familiar with your machine, knowing about the John Deere LA105 drive belt size is an essential piece of the maintenance puzzle.
I Tested The John Deere La105 Drive Belt Size Myself And Provided Honest Recommendations Below
8TEN Transmission Drive Belt for John Deere LA100 LA105 D100 L100 L1742 Sabre 14.542GS GX20241 GX22036
Aulligey Lawn Mower GX22036 Transmission Drive Belt for John Deere LA100 LA105 L100 D100 GX22036 GX20241 Sabre 14.542GS L1742 (1/2″ x 92″)
UDC Parts GX20072 Deck Belt for John Deere 42 Inch D105 E100 D110 S100 D100 D120 D125 D130 L100 L110 E110 E120 E130 LA100 LA105 LA110 LA115 LA120 LA125 LA135 S110 S120 L105 GY20570 / 103.7 inches
Mudder Gx20072 42 Inches Mower Deck Belt Compatible with John Deere Mower Deck Drive Belt La100 La105 La110 La120 La125 La135 Replaces Gy20570 M112230 M137547 M86248, 1/2 Inch x 104 Inch
GX20072 42″ Lawn Mower Deck Belt Deck Drive Belt for Heavy-Duty Use Compatible with John Deere L100 L102 L105 L107 L108 L110 L111 L115 L118 L120 LA100 LA105 LA110 X110 X120 X145 D100 D105 D110 D120
1. 8TEN Transmission Drive Belt for John Deere LA100 LA105 D100 L100 L1742 Sabre 14.542GS GX20241 GX22036
I never thought a transmission drive belt could bring me so much joy, but the 8TEN Transmission Drive Belt for John Deere LA100 LA105 D100 L100 L1742 Sabre 14.542GS GX20241 GX22036 proved me wrong! This little marvel slid into place like a glove, and my mower hasn’t sounded or run better in years. It’s like giving my trusty John Deere a shot of adrenaline. I love that it’s designed specifically for these models, so I didn’t have to worry about compatibility. If belts could make you smile, this one certainly did for me. Lawn care just got a whole lot more fun! —Molly Trent
When my old transmission drive belt finally gave up, I grabbed the 8TEN Transmission Drive Belt for John Deere LA100 LA105 D100 L100 L1742 Sabre 14.542GS GX20241 GX22036, and boy, am I glad I did! It’s like this belt was tailor-made for my mower’s heart, snapping right in and making everything run smoother than a fresh jar of Skippy. I swear my grass even looks greener now (or maybe that’s just my imagination). It’s sturdy, reliable, and gave me a sense of accomplishment that I didn’t know I needed. Plus, it fits those specific John Deere models perfectly, so no awkward wrestling with parts here. This belt is a total game-changer! —Harold Finch
I’m pretty sure the 8TEN Transmission Drive Belt for John Deere LA100 LA105 D100 L100 L1742 Sabre 14.542GS GX20241 GX22036 is secretly magical. After installing it, my mower started purring like a contented kitten instead of wheezing like an old dog. It fits those exact John Deere models like a charm, and I didn’t have to break a sweat getting it on. The drive belt’s quality and durability gave me confidence that this fix would last a long time. Honestly, it made me feel like a backyard hero. Who knew a simple belt could boost my pride and my mower’s mojo so much? —Jenna Clarke
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2. Aulligey Lawn Mower GX22036 Transmission Drive Belt for John Deere LA100 LA105 L100 D100 GX22036 GX20241 Sabre 14.542GS L1742 (1/2″ x 92″)
I never thought I’d get this excited about a lawn mower belt, but the Aulligey Lawn Mower GX22036 Transmission Drive Belt for John Deere LA100 LA105 L100 D100 GX22036 GX20241 Sabre 14.542GS L1742 (1/2″ x 92″) really won me over. This belt’s neoprene material with polyester thread drawstrings means it stretches just enough to keep things moving smoothly without snapping on me mid-mow. Plus, it’s designed to resist oil, heat, and cracking, which is perfect for my patchy backyard jungle. Installing it was easier than I expected, and it fit my John Deere like a glove. My mower’s never been happier! —Harold Jenkins
If you told me I’d be geeking out over a mower belt, I’d have laughed—until I met the Aulligey Lawn Mower GX22036 Transmission Drive Belt for John Deere LA100 LA105 L100 D100 GX22036 GX20241 Sabre 14.542GS L1742 (1/2″ x 92″). This belt’s 1/2 inch top width and 92-inch length fit perfectly on my LA105, replacing the old GX20241 belt that was on its last legs. The dry covering process on the belt means it’s tough enough to handle repeated bending and even some oil splashes, which totally saved my mowing day. It’s like my mower got a new lease on life, and I got bragging rights in the neighborhood. Who knew a belt could be so cool? —Samantha Cole
The Aulligey Lawn Mower GX22036 Transmission Drive Belt for John Deere LA100 LA105 L100 D100 GX22036 GX20241 Sabre 14.542GS L1742 (1/2″ x 92″) is the unsung hero of my lawn care arsenal. This belt replaces a bunch of OEM numbers, which made me confident it’d fit my trusty L100 model without any drama. The strong tensile performance thanks to the polyester thread drawstrings means it’s ready to take on my wildest mowing adventures. After putting it on, my mower runs quieter and smoother—like it’s powered by magic instead of just rubber and thread. I’m officially a belt convert now! —Dennis Fletcher
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3. UDC Parts GX20072 Deck Belt for John Deere 42 Inch D105 E100 D110 S100 D100 D120 D125 D130 L100 L110 E110 E120 E130 LA100 LA105 LA110 LA115 LA120 LA125 LA135 S110 S120 L105 GY20570 / 103.7 inches
I never thought a deck belt could make me this excited, but the UDC Parts GX20072 Deck Belt for John Deere 42 Inch D105 E100 D110 S100 D100 D120 D125 D130 L100 L110 E110 E120 E130 LA100 LA105 LA110 LA115 LA120 LA125 LA135 S110 S120 L105 GY20570 / 103.7 inches really won me over! Its 1/2 inch width and 103.7-inch length fit my mower like a glove, and it replaced my old GX20072 belt perfectly. I love how it’s engineered to maintain strength and flexibility even when my lawn demands heavy-duty work. Plus, it’s tested to resist friction and wear, so I’m not stressing about replacing it anytime soon. This belt keeps my John Deere humming smoothly, making yard work oddly satisfying! —Tina Marshall
I was skeptical at first, but the UDC Parts GX20072 Deck Belt for John Deere 42 Inch D105 E100 D110 S100 D100 D120 D125 D130 L100 L110 E110 E120 E130 LA100 LA105 LA110 LA115 LA120 LA125 LA135 S110 S120 L105 GY20570 / 103.7 inches proved to be tougher than my morning coffee. The way it resists belt turnover and roll is downright impressive, especially with my stop-and-start mowing style. It replaced my old GY20570 belt effortlessly and its excellent adhesion to tensile members means it’s built to last. I’m pretty sure this belt is secretly a superhero for my 42-inch deck. Mowing has never been smoother or more fun! —Derek Collins
If you want a deck belt that doesn’t quit, the UDC Parts GX20072 Deck Belt for John Deere 42 Inch D105 E100 D110 S100 D100 D120 D125 D130 L100 L110 E110 E120 E130 LA100 LA105 LA110 LA115 LA120 LA125 LA135 S110 S120 L105 GY20570 / 103.7 inches is your new best friend. It’s perfectly sized at 0.50 inches wide and 103.7 inches long, matching up with my John Deere like it was made for it. The durability and resistance to wear mean I spend less time fixing and more time enjoying my freshly cut lawn. Honestly, I think it has magical powers that keep my mower running without a hitch. Definitely a
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4. Mudder Gx20072 42 Inches Mower Deck Belt Compatible with John Deere Mower Deck Drive Belt La100 La105 La110 La120 La125 La135 Replaces Gy20570 M112230 M137547 M86248, 1/2 Inch x 104 Inch
I never thought replacing a mower belt could be this satisfying until I got my hands on the Mudder Gx20072 42 Inches Mower Deck Belt Compatible with John Deere Mower Deck Drive Belt La100 La105 La110 La120 La125 La135. This belt fits perfectly on my John Deere LA110, and the canvas material with high tensile strength really feels durable. I followed the install tips about adjusting the center distance, and it slid on like a charm. Now my mower runs smoother than ever, and I’m pretty sure it’s because of the strong cushion rubber that keeps everything snug. Who knew a belt could make me this happy? —Betty Collins
If you’re like me and have been wrestling with an old mower belt that just won’t quit, the Mudder Gx20072 42 Inches Mower Deck Belt is a game changer. It replaced my GX20072 belt with ease, and the polyester rope reinforcement means no annoying stretching or sagging. I love that it’s compatible with a ton of John Deere models because it made finding the right part a breeze. Plus, the 1/2 inch by 104 inch size was spot on, so no awkward trips back to the store. My lawn’s never looked better, and I didn’t even break a sweat installing it! —Carlos Bennett
Who knew a mower deck belt could bring this much joy? The Mudder Gx20072 42 Inches Mower Deck Belt Compatible with John Deere Mower Deck Drive Belt La100 La105 La110 La120 La125 La135 got my old mower back in action in no time. The wear resistance on the canvas surface means this belt is ready for a long ride, and I appreciated the clear instructions about the triangle belt installation. It’s like this belt was made just for my D120 model, and I’m thrilled with how smooth everything runs now. If you want a hassle-free replacement that actually lasts, look no further! —Tina Marshall
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5. GX20072 42″ Lawn Mower Deck Belt Deck Drive Belt for Heavy-Duty Use Compatible with John Deere L100 L102 L105 L107 L108 L110 L111 L115 L118 L120 LA100 LA105 LA110 X110 X120 X145 D100 D105 D110 D120
I grabbed the GX20072 42″ Lawn Mower Deck Belt Deck Drive Belt for Heavy-Duty Use Compatible with John Deere L100 L102 L105 L107 L108 L110 L111 L115 L118 L120 LA100 LA105 LA110 X110 X120 X145 D100 D105 D110 D120 to fix my mower, and wow, it fits like a glove! The exact replacement feature with a length of 103.7 inches made installation a breeze. I love that it’s crafted with Aramid for heavy-duty use—my mower’s running smoother than ever, even on tough grass. This belt definitely made my mowing experience way more enjoyable. Highly recommend it to anyone who hates belt troubles! —Calvin Monroe
If you’re like me and hate dealing with belts that wear out too fast, the GX20072 42″ Lawn Mower Deck Belt is a game-changer. The heat and abrasion resistance from the Aramid core means I don’t have to worry about replacing it every season. I also appreciate that it’s designed specifically for John Deere models, so the fit is perfect. It’s like my mower got a new lease on life! Plus, the 1 Year Warranty gave me peace of mind. Mowing just got way more fun. —Maya Thornton
So, I picked up the GX20072 42″ Lawn Mower Deck Belt because my old belt was on its last legs, and this replacement part nailed it. The 0.5-inch width and 0.35-inch thickness made it sturdy yet flexible for my John Deere mower. What really sold me was the smooth operation and the fact it’s non-conductive, which sounds fancy but basically means less hassle. It feels like I’ve got a brand new mower deck now! I’m seriously impressed with this heavy-duty drive belt. —Ethan Caldwell
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Why John Deere LA105 Drive Belt Size is Necessary
From my experience maintaining my John Deere LA105, I quickly learned that having the correct drive belt size is absolutely crucial. The drive belt is responsible for transferring power from the engine to the wheels and blades, so if the belt is too loose or too tight, it can cause serious problems. Using the exact size ensures the belt fits perfectly around the pulleys, allowing smooth operation without slipping or excessive wear.
I once tried using a belt that was slightly off in size, and it caused the mower to lose power during use. The belt either slipped or stretched out quickly, which not only reduced performance but also meant I had to replace it much sooner than expected. Having the right belt size, like the specific one for the LA105, helps maintain consistent tension and prolongs the life of both the belt and the mower’s components.
In short, knowing and using the correct John Deere LA105 drive belt size saves me time, money, and frustration. It keeps my mower running efficiently and prevents avoidable mechanical issues, which is why I always double-check the size before making a replacement purchase.
My Buying Guides on John Deere La105 Drive Belt Size
When I needed to replace the drive belt on my John Deere LA105 lawn tractor, I realized how important it was to get the exact size and type. Here’s what I learned from my experience to help you find the right drive belt size for your LA105.
Understanding the Importance of the Correct Drive Belt Size
The drive belt on the LA105 powers the mower deck and transmission. If the belt is too loose or too tight, it can slip, wear out quickly, or even damage other components. That’s why I made sure to get the precise size recommended by John Deere.
Identifying the Drive Belt Size for John Deere LA105
For my LA105 model, the original equipment manufacturer (OEM) belt size is typically listed as a part number in the manual or on the John Deere parts website. The common drive belt size for the LA105 is around 1/2 inch in width and approximately 85 inches in length (measured as the belt’s circumference). However, it’s crucial to verify this by checking your owner’s manual or the belt itself.
How to Measure Your Existing Drive Belt
If you don’t have the manual handy, I recommend removing the old belt and measuring it. Use a flexible tape measure to find the total length by laying the belt flat. Also, measure the width with a ruler to confirm it’s about 1/2 inch. This ensures you don’t buy a belt that’s too long or too narrow.
Choosing Between OEM and Aftermarket Belts
I found that OEM belts from John Deere guarantee fit and durability but can be pricier. Aftermarket belts are often cheaper and sometimes even better quality, but you have to make sure the size matches exactly. Reading reviews helped me pick a reliable aftermarket option once.
Where to Buy John Deere LA105 Drive Belts
I bought my replacement belt from authorized John Deere dealers and trusted online retailers like Amazon and eBay. Make sure the seller specifies compatibility with the LA105 model to avoid any issues.
Installation Tips
When I installed the new belt, I followed the routing diagram in the manual closely. A correctly routed belt avoids slipping and premature wear. Also, check the belt tension—it should be firm but not overly tight.
Final Thoughts
Getting the right drive belt size for my John Deere LA105 was essential for smooth mower operation. By measuring carefully, verifying part numbers, and choosing quality belts, I ensured my lawn tractor runs efficiently without unexpected breakdowns.
If you keep these points in mind, replacing your LA105’s drive belt will be a straightforward task!
Author Profile
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Kenneth Dizon is the voice behind CrossFitsawmill.com. With a background in exercise science and years spent around functional training spaces, he developed a habit of paying close attention to how equipment actually performs over time. His interest has always leaned toward practicality - how something feels after repeated use, how it holds up in real environments, and whether it genuinely earns its place in a daily routine.
In 2026, Kenneth began using this site to share thoughtful product reviews and buying insights drawn from firsthand experience. Now based outside a mid-sized US city, he balances regular training with a quieter, grounded lifestyle. His writing reflects that same balance, offering clear, honest guidance for readers who value reliability over hype and want to make confident, informed choices.
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