## **520 Chain Size Explained: What the Numbers Really Mean**
If you ride a motorcycle, you’ve likely seen “520” stamped on a chain box or spec sheet. But what does **520 chain size** actually mean? Understanding these numbers helps you choose the right chain, sprockets, and maintain peak drivetrain performance for your bike.
### **What Do the Numbers in 520 Chain Size Mean?**
A 520 chain’s three digits aren’t random—each represents a critical dimension:
– **First digit (5):** The chain’s **pitch** in eighths of an inch. A “5” means 5/8 inch (15.875mm) between pins. Pitch determines how the chain meshes with sprocket teeth.
– **Last two digits (20):** The **roller width** between inner plates, measured in eighths of an inch. “20” means 2.0 × 1/8 = 1/4 inch (6.35mm) of usable inner width.
So a 520 chain has a 5/8″ pitch and 1/4″ roller width—making it lighter than a 530 but stronger than a 525.
### **520 vs 525 vs 530: Why It Matters**
**Chain size comparison** reveals trade-offs. A 530 chain is wider and heavier—common on big touring bikes. A 525 is a middle ground. The 520 chain size is popular on **sportbikes, dirt bikes, and smaller-displacement motorcycles** because it reduces rotating mass without sacrificing tensile strength.
Switching to a 520 conversion often saves 1–2 pounds, improving acceleration and suspension response. However, you **must change sprockets too**—a 520 chain won’t fit 530 sprockets.
### **Pitch and Roller Width: The Technical Details**
**Pitch** is the distance between three consecutive pin centers divided by two. It controls load distribution and wear. **Roller width** affects how the chain sits on sprocket teeth and its side-to-side clearance. For a deeper breakdown of these dimensions, check our full 520 chain size guide.
**Tensile strength** for a 520 ranges from 7,000–9,000 lbs, depending on manufacturer and whether it’s O-ring, X-ring, or standard.
### **Frequently Asked Questions**
**Q: Can I replace a 530 chain with a 520?**
Yes, if you swap both sprockets. This is a common performance upgrade.
**Q: How often should I replace a 520 chain?**
Every 15,000–20,000 miles for street use; more often for dirt bikes.
**Q: Is a 520 chain weak?**
Not at all—modern 520 chains handle 100+ horsepower when properly maintained.
### **Final Thoughts & Call to Action**
Understanding 520 chain size—pitch and roller width—empowers you to choose the right setup. Whether you’re converting for weight savings or replacing a worn chain, match your chain to your sprockets and riding style.
**Ready to upgrade?** Measure your current chain, pick a 520, and enjoy a sharper, lighter ride. Always check your owner’s manual for OEM specs before changing sizes.