## **520 Chain Size: The Ultimate Guide to Pitch, Dimensions, and Compatibility**

If you ride a motorcycle, understanding your drivetrain is non-negotiable. Among the most common sizes on the road today, the **520 chain size** is a goldilocks option—lighter than a 530 but stronger than a 428. But what do those numbers actually mean, and is it the right choice for your bike?

### **What Does 520 Chain Size Actually Mean?**

The numbers refer to the chain’s **pitch and roller width**. In a 520 chain, the “5” indicates a pitch of **5/8 of an inch** (the distance between pins), while the “20” denotes a roller width of **2.0 eighths of an inch** (or 1/4 inch). This makes it narrower and lighter than a 530 chain, yet more robust than a 428.

### **Pitch and Dimensions Explained**

– **Pitch:** 5/8 inch (15.875 mm) — the distance between adjacent pins.
– **Roller Width:** 1/4 inch (6.35 mm) — the inner width between plates.
– **Roller Diameter:** ~10.16 mm (varies slightly by manufacturer).
– **Average Tensile Strength:** 7,000–8,500 lbs, depending on brand and material.

Because of these compact dimensions, a 520 chain reduces rotational mass, freeing up a bit of horsepower and improving suspension response. That’s why sportbikes, dirt bikes, and even some adventure tourers come stock with this size.

### **Why Riders Choose the 520 Chain Size**

Switching to a 520 setup is a popular upgrade for **performance-oriented riders**. The weight savings—often 1–2 pounds compared to a 530—translate to quicker acceleration and less unsprung weight. However, **durability** can be a trade-off. A narrower chain wears faster under high torque or poor maintenance. For everyday commuting on a liter bike, a 530 might last longer; for track days or off-road, the 520 shines.

### **Compatibility: Will It Fit Your Bike?**

A 520 chain requires **sprockets designed for 520 pitch**. You cannot mix a 520 chain with 530 sprockets—the width mismatch will cause rapid wear or failure. Many bikes can be converted, but always check:

1. **Front and rear sprocket widths** — must match 520.
2. **Clearance** — narrower chain may fit where a 530 won’t, but verify swingarm and case clearance.
3. **Master link type** — rivet or clip-on, depending on your riding style.

If you’re unsure about your current setup, this detailed guide on 520 chain size breaks down every dimension with charts.

### **FAQs About 520 Chain Size**

**Q: Can I use a 520 chain on a 530 sprocket?**
No—the roller width and sprocket tooth thickness won’t match, leading to unsafe wear.

**Q: How often should I adjust a 520 chain?**
Check slack every 500 miles. It stretches faster than a 530, especially on high-torque bikes.

**Q: Is a 520 chain strong enough for a 1000cc sportbike?**
Yes, if you buy a high-tensile X-ring or Z-ring chain from a reputable brand. Racing teams use 520 chains on liter bikes regularly.

### **Ready to Upgrade or Replace?**

Choosing the right chain size impacts **performance, safety, and cost**. If you’re due for a new drivetrain, measure your sprockets,