Exmark 110-1790-SL Deck Belt Commercial Walk Behind Mower 21-Inch 110-1790 Review
By the Mowers.Cloud editorial team · How we research & rate · Updated June 2026
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The Exmark 110-1790-SL Deck Belt is a replacement part designed specifically for Exmark’s commercial-grade 21-inch walk-behind mowers. It’s not a mower itself but a critical component that keeps your machine cutting cleanly and efficiently. This belt is built for landscapers, turf care pros, and serious homeowners who own an Exmark and need a reliable, OEM-spec replacement to maintain peak performance.
Who Should Buy This
1. Exmark commercial mower owners – If you run an Exmark 21-inch walk-behind for daily mowing, this belt is the direct-fit replacement you need to avoid downtime. It’s designed to handle the high-torque demands of commercial use.
2. DIY homeowners with Exmark equipment – You’ve invested in a premium mower, so don’t cheap out on aftermarket belts. This OEM part ensures proper tension and longevity, saving you from premature wear or belt snap mid-mow.
3. Small landscaping businesses – Fleet managers who maintain multiple Exmark units will appreciate the consistent quality and easy installation. Stocking this belt means less guesswork when a deck belt fails on the job.
4. Anyone experiencing slipping or poor cut quality – If your Exmark’s deck belt is worn, stretched, or glazed, this replacement restores blade speed and cut consistency. It’s a straightforward fix for a common issue.
Key Features Breakdown
OEM Exmark specification – This isn’t a generic belt. It’s built to Exmark’s exact tolerances, meaning it fits the pulleys and tensioner system without modification. That matters because even a 1/8-inch difference can cause vibration or premature failure.
21-inch deck compatibility – Designed for Exmark’s 21-inch commercial walk-behinds, which are known for their maneuverability and cut quality. The belt drives both blades on this deck size, so it must handle balanced load distribution.
Durable construction – The belt uses reinforced rubber compound with embedded cords for tensile strength. This resists stretching and cracking under the heat and stress of prolonged mowing, especially in thick grass or on slopes.
Direct replacement – No modifications, no adapters. Remove the old belt, route this one exactly as the diagram shows, and you’re back to mowing. For pros, that means less than 15 minutes of downtime.
Works with Exmark blade brake clutch systems – Many Exmark walk-behinds have a blade stop feature for safety. This belt is compatible with that system, so you don’t lose functionality.
Pros
- Perfect OEM fit – No guesswork or return headaches. It matches the original belt exactly.
- Consistent blade speed – Proper tension means the blades spin at full RPM, giving you a clean, even cut even in damp or tall grass.
- Longer lifespan than aftermarket belts – The reinforced construction resists glazing and cracking, often lasting a full season or more with regular use.
- Easy installation – Clear routing path on Exmark decks. No special tools required beyond a socket set.
- Quiet operation – A well-fitted belt reduces squeaking and slapping against the deck, which is a common complaint with off-brand belts.
- Peace of mind – Using an OEM part protects your mower’s warranty and avoids voiding coverage from belt-related damage.
Cons
- Price premium – At $28.99, it costs more than generic options. But you’re paying for exact fit and reliability.
- Limited compatibility – Only fits specific Exmark 21-inch walk-behind models. Double-check your model number before ordering.
- No included installation guide – If you’re new to deck belt replacement, you’ll need to look up the routing diagram online or in your manual.
- Not for all Exmark mowers – Larger decks (30, 36, 48 inches) use different belts. This is strictly for the 21-inch platform.
Bottom Line
The Exmark 110-1790-SL Deck Belt is the right choice if you own an Exmark 21-inch commercial walk-behind and want to keep it running like new. It’s not the cheapest option, but the OEM fit, durability, and consistent performance make it worth the investment for anyone who relies on their mower for income or a pristine lawn. If you’re a weekend warrior with a different brand, skip this. But if you’ve got an Exmark, this belt will save you time, frustration, and uneven cuts.
Frequently Asked Questions
Q: How do I know if this belt fits my Exmark mower?
Check your mower’s model number and deck size. This belt fits 21-inch Exmark walk-behinds with a specific part number 110-1790. Look for it in your owner’s manual or on the old belt’s label. If you have a 30-inch or larger deck, you need a different belt.
Q: How often should I replace the deck belt on my Exmark?
For commercial use, inspect the belt every 50 hours and replace it annually or when you see cracking, glazing (shiny spots), or fraying. Homeowners may get 2-3 seasons with light use. Replace it immediately if you notice slipping, squealing, or a poor cut.
Q: Can I use a universal belt instead?
You can, but it’s not recommended. Universal belts often have slightly different lengths or widths, causing improper tension, faster wear, or belt throw. The Exmark OEM belt is engineered for your specific pulley system and deck design, so you’ll get better performance and longer life.
How It Compares
Here is a head-to-head comparison of the Exmark 110-1790-SL deck belt and the AR-PRO inner tube set.
Important Note: These two items are not lawn mowers. The Exmark is a replacement deck belt for a commercial walk-behind mower, and the AR-PRO is a set of inner tubes for tires. This comparison will evaluate them as the replacement parts they are, focusing on their utility for lawn mower maintenance.
Quick Verdict
Neither wins overall because they serve completely different purposes; buy the Exmark belt if you need to repair your mower’s cutting deck, and buy the AR-PRO tubes if you need to replace flat tires on your mower or garden equipment.
Side-by-Side Comparison
| Feature | Exmark 110-1790-SL Deck Belt | AR-PRO Inner Tube (2-Pack) |
|---|---|---|
| Price | $28.99 | $24.79 |
| Product Type | V-belt for blade drive | Inner tube for tire |
| Primary Function | Transfers power from engine to blades | Holds air inside a pneumatic tire |
| Compatibility | Specific to Exmark 21" commercial walk-behinds | Universal: 20x8.00-8, 20x10.00-8, 20x8-8, 20x10-8 |
| Warranty | None listed (OEM part) | None listed (value-priced accessory) |
| Customer Rating | 4.5/5 (12 reviews) | 4.3/5 (20,211 reviews) |
| Best Use Case | Replacing a worn or broken mower deck belt | Replacing a punctured or dry-rotted tire tube |
Where Exmark Wins
- OEM Fit and Durability: This is an Exmark-branded belt, meaning it is manufactured to the exact specifications (length, width, and tensile strength) required for Exmark’s 21-inch commercial walk-behind mowers. Aftermarket belts can slip or wear prematurely; this belt is guaranteed to fit and last as long as the original.
- Critical for Mower Operation: Without this belt, the mower’s blades will not spin. It is a direct, essential component for cutting grass. It is not a secondary accessory—it is a repair part that restores the machine to full function.
- High Precision for Commercial Use: With a 4.5-star rating from a smaller sample (likely commercial operators), this belt is built for high-tension, daily-use scenarios. It resists stretching and heat better than generic belts, which is critical for a commercial mower that runs for hours.
Where AR-PRO Wins
- Overwhelming Popularity and Proven Value: With over 20,000 reviews and a 4.3-star average, this is a massively proven product. The sheer volume of positive feedback indicates it works reliably across thousands of different mowers, tractors, and trailers.
- Universal Compatibility: While the Exmark belt fits only one specific mower model, the AR-PRO tubes fit multiple tire sizes (20x8.00-8, 20x10.00-8, etc.). They work on lawn tractors, zero-turn mowers, golf carts, and garden trailers, making them a versatile spare part.
- Lower Price for a Two-Pack: At $24.79 for two tubes, the price per tube is roughly $12.40. This is significantly cheaper than buying a single OEM tube from a dealership. It is an excellent budget-friendly solution for replacing old, leaky tubes.
Which Should You Buy?
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Buy Mower A (Exmark Belt) if: You own an Exmark 21-inch commercial walk-behind mower and the deck belt is snapped, frayed, or stretched. This is a necessary repair part—without it, your mower will not cut grass. Buy this belt to restore your machine to working order with a guaranteed OEM fit.
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Buy Mower B (AR-PRO Tubes) if: You have a flat tire on a lawn tractor, zero-turn mower, golf cart, or garden trailer, and the tire size is 20x8.00-8 or 20x10.00-8. This two-pack is a cost-effective, highly-rated solution for replacing old, leaky tubes. It is ideal for preventive maintenance or fixing a sudden puncture.
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Buy Neither if: You are looking for a complete lawn mower. Both products are replacement parts, not mowers. If you need a new machine, you should look for a complete walk-behind mower or riding mower from brands like Honda, Toro, or John Deere.
Quick Verdict
Neither mower wins overall because these are not complete mowers—they are replacement deck belts—so the choice depends entirely on which brand of mower you own.
Side-by-Side Comparison
| Feature | Exmark 110-1790-SL | UDC Parts 041-1650-00 |
|---|---|---|
| Price | $28.99 | $36.29 |
| Product Type | Replacement deck belt | Replacement deck belt |
| Compatible Mowers | Exmark 21" commercial walk-behind | Bad Boy ZT Elite 60", Maverick 60", ZT Avenger, B165, Outlaw 54" |
| Belt Length | Not specified (fits 21" deck) | 168.00 inches |
| Material | Not specified | Aramid cord |
| Rating | 4.5/5 (12 reviews) | 4.3/5 (12,730 reviews) |
| Best Yard Size | N/A (part, not mower) | N/A (part, not mower) |
| Warranty | Not listed | Not listed |
Where Exmark Wins
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Higher Average Rating – With a 4.5-star average from 12 reviews, the Exmark belt holds a slightly better user satisfaction score, suggesting strong quality control for its specific application.
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Lower Price – At $28.99, this belt costs $7.30 less than the UDC option, making it the more budget-friendly choice for Exmark owners.
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OEM Fitment – This is an original Exmark part (model 110-1790-SL), which guarantees exact dimensions and material specifications for Exmark’s 21-inch commercial walk-behind mower, eliminating guesswork.
Where UDC Wins
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Vastly More Reviews – With 12,730 ratings compared to just 12 for Exmark, the UDC belt has been tested at scale. This volume provides far more reliable feedback on long-term durability and fitment consistency.
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Proven Aramid Cord Construction – The UDC belt uses aramid (Kevlar-like) cord reinforcement, which offers superior heat resistance and tensile strength compared to standard rubber or polyester cords—critical for high-torque zero-turn mowers.
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Multi-Model Compatibility – This single belt fits at least five different Bad Boy mower models (ZT Elite 60", Maverick 60", ZT Avenger, B165, Outlaw 54"), making it a versatile replacement for owners with multiple Bad Boy machines or those who may upgrade within the brand.
Which Should You Buy?
Buy Mower A (Exmark 110-1790-SL) if: You own an Exmark 21-inch commercial walk-behind mower and want a guaranteed OEM fit at a lower price. With only 12 reviews but a perfect 4.5-star average, this belt is a safe, cost-effective choice for Exmark owners who prefer factory parts and don’t need the extra strength of aramid cord for a smaller deck.
Buy Mower B (UDC Parts 041-1650-00) if: You own a compatible Bad Boy zero-turn mower (ZT Elite 60", Maverick 60", ZT Avenger, B165, or Outlaw 54"). The aramid cord construction provides superior durability under the high belt speeds and heat of 60-inch decks, and the massive review base (12,730 ratings) confirms this belt performs reliably over time. It’s also the better choice if you value proven mass-market performance over OEM branding.
Buy neither if: You own a different mower brand or model. These belts are not universal—the Exmark belt is designed specifically for a 21-inch walk-behind, while the UDC belt is built for 54-60 inch Bad Boy zero-turns. Always confirm your mower’s deck belt length and part number before purchasing.
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