## **520 Chain Size Explained: Pitch, Roller Width, and Compatibility Guide**
If you ride a 500cc–800cc motorcycle or a high-performance dirt bike, the **520 chain size** is likely the heart of your drivetrain. But what do those numbers actually mean, and how do you know if a 520 chain fits your bike? Let’s break it down in plain English.
### **What Does 520 Mean?**
The “520” designation isn’t random. The first digit (**5**) refers to the **pitch**—the distance between chain pins—measured in eighths of an inch. A 5/8-inch pitch is standard for most modern motorcycles. The last two digits (**20**) indicate the **roller width** in eighths of an inch. So a 520 chain has a 5/8″ pitch and a 2/8″ (or 1/4″) roller width. This makes it narrower and lighter than a 530 chain, but stronger than a 428.
### **Why Pitch and Roller Width Matter**
**Pitch** determines how the chain meshes with your sprockets. If the pitch is wrong, the chain will skip or bind. **Roller width** affects how the chain sits on the sprocket teeth and how much lateral space it needs. A 520 chain is a popular middle ground—lighter than a 530 but tougher than a 428. That’s why you’ll find it on bikes like the Honda CB500X, Yamaha MT-07, and most 450cc motocrossers.
### **Compatibility: Will a 520 Chain Fit Your Bike?**
Not all 520 chains are interchangeable. You must match the **chain size** to your sprockets. If your bike came with a 520 chain from the factory, replacing it with another 520 is straightforward. But if you’re converting from a 530 to a 520 (a common weight-saving mod), you’ll need new sprockets and possibly a different rear sprocket offset. Always check your owner’s manual or use a trusted 520 chain size guide before buying.
### **Chain Length and Link Count**
A 520 chain is sold in link counts (e.g., 110, 120 links). Your bike’s swingarm length and sprocket sizes determine the correct count. Too short, and it won’t fit; too long, and you’ll need to cut it. Most manufacturers list the stock link count in the service manual. When in doubt, buy a longer chain and remove links as needed.
### **FAQs About 520 Chain Size**
**Q: Can I use a 520 chain on a 530 sprocket?**
No. The pitch and roller width differ, causing rapid wear and dangerous skipping.
**Q: Is a 520 chain stronger than a 530?**
Not inherently. A 530 chain has a wider roller and thicker plates, so it’s stronger. But a high-quality 520 O-ring chain can handle up to 800cc with proper maintenance.
**Q: How often should I replace my 520 chain?**
Every 15,000–20,000 miles for street bikes, or more often for off-road use. Check for stretch and tight spots.
### **Ready to Upgrade or Replace?**
Don’t guess—measure. Grab your calipers, count your links, and confirm your sprocket sizes. Whether you’re replacing a worn chain or converting for weight savings, the right **520 chain size** keeps your ride smooth and safe. **Check your manual, verify compatibility, and ride on.**
