## **520 Chain Size Explained: Pitch, Width, and Length Guide**
If you ride a motorcycle, you have probably heard about **520 chain size**—but what do those numbers really mean? Understanding **pitch, width, and length** is essential for choosing the correct chain for your bike. This guide breaks down **520 chain size** in a clear, practical way.
### **What Does “520” Mean?**
The **520 chain size** follows a standard numbering system. The **first digit (5)** represents the **pitch**—the distance between two adjacent pins, measured in eighths of an inch. A “5” means **5/8 inch pitch**. The **last two digits (20)** indicate the **inner width** between the plates, measured in eighths of an inch. So a **520 chain** has a **2/8 inch (1/4 inch) inner width**.
### **Pitch: The Backbone of Chain Fit**
**Pitch** is the most critical dimension. For a **520 chain size**, the pitch is **5/8 inch (15.875 mm)**. This must match your sprocket teeth exactly. If the pitch is wrong, the chain will not seat properly and can damage your sprockets. Most modern sportbikes and dirt bikes use this pitch.
### **Width: Clearance Matters**
**Inner width** for a **520 chain** is **1/4 inch (6.35 mm)**. This is narrower than a 530 chain (3/8 inch) but wider than a 428 chain. The width affects **sprocket thickness**—a 520 sprocket is thinner than a 530 but thicker than a 428. Using the wrong width can cause poor alignment and rapid wear.
### **Length: Counting Links**
**Chain length** is measured in **links**. A **520 chain** typically has **110 to 120 links** for most motorcycles. You determine the correct length by checking your owner’s manual or counting the links on your old chain. **Never guess**—too short and it won’t fit; too long and it may derail.
### **Why 520 Chain Size Is Popular**
The **520 chain size** offers a great balance of **strength, weight, and cost**. It is lighter than a 530 chain, which reduces rotational mass, but stronger than a 428 chain. This makes it ideal for **motocross, enduro, and middleweight sportbikes**. For a deeper dive into motorcycle chain dimensions, see this comprehensive 520 chain size guide.
### **Common Mistakes to Avoid**
– **Mixing pitch**: Never use a 520 chain on 530 sprockets.
– **Wrong width**: A 520 chain will not fit 530 sprockets.
– **Ignoring length**: Always count links.
– **Skipping lubrication**: Even the best chain wears fast without care.
### **FAQ: 520 Chain Size**
**Q: Can I replace a 530 chain with a 520?**
A: Only if you also change both sprockets to 520. Otherwise, it won’t fit.
**Q: How often should I replace a 520 chain?**
A: Every **10,000–20,000 miles** for street use, or **20–30 hours** for dirt bikes, depending on maintenance.
**Q: Is a 520 chain stronger than a 530?**
A: No—530 is stronger but heavier. 520 is lighter and adequate for most mid-size bikes.
**Q: What is the tensile strength of a 520 chain?**
A: Typically **7,000–9,000 lbs**, varying by brand and quality.
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