## 520 Chain Dimensions: Complete Size, Pitch, and Roller Diameter Guide
If you ride a mid-displacement motorcycle, the **520 chain** is likely what transfers power from your engine to the rear wheel. Understanding **520 chain dimensions** helps you replace, upgrade, or maintain your drivetrain with confidence. This guide breaks down every critical measurement so you can buy the right chain the first time.
### What Does “520” Actually Mean?
The number **520** follows a standardized naming system. The first digit (**5**) represents the chain’s pitch in eighths of an inch — so 5/8 inch, or **15.875 mm**. The last two digits (**20**) indicate the roller diameter and inner width. A 520 chain has a roller diameter of **10.16 mm** and an inner width of **6.35 mm**. These figures distinguish it from a 525 or 530 chain, which share the same pitch but use wider rollers and plates. That means a 520 chain is narrower and lighter, making it a popular upgrade for sportbikes and dirt bikes.
### 520 Chain Size Chart and Key Measurements
Below are the core specs you’ll see on any 520 chain spec sheet:
– **Pitch:** 15.875 mm (5/8 inch)
– **Roller Diameter:** 10.16 mm
– **Inner Width:** 6.35 mm
– **Pin Diameter:** Typically 5.08 mm
Keyword: 520 chain dimensions
– **Tensile Strength:** 7,000–8,500 lbs depending on the brand
These numbers matter because they determine compatibility with your sprockets. A chain that’s too wide won’t seat properly, and the wrong pitch will damage teeth quickly.
### 520 vs. 525 vs. 530: Why Size Matters
Many riders ask whether they can swap a 520 for a 530. The answer depends on your sprockets. Since all three share the same 5/8-inch pitch, the difference lies in **width and weight**. A 520 chain is about **25% lighter** than a 530, which reduces rotational mass and can free up a small amount of horsepower. However, a narrower chain has less tensile strength. For track bikes and smaller engines, this trade-off is worth it. For heavy touring bikes, a 530 is often the better choice. Always match your chain to your sprocket width.
### Roller Diameter and Wear: What to Watch
The **roller diameter** isn’t just a spec — it affects how smoothly the chain engages the sprocket. As the chain wears, the rollers and pins erode, causing the chain to “stretch.” A worn 520 chain will sit higher on the sprocket teeth, accelerating wear. Check your chain’s slack regularly and measure its length against the service limit in your manual. Replacing a chain before it damages the sprockets saves money in the long run. For a deeper look at how 520 compares to other sizes, see this guide to [520 chain dimensions](https://www.motomaxsfr.com/motorcycle-chain-sizes-dimensions-explained/).
### Common Questions About 520 Chains
**Can I use a 520 chain on a 530 sprocket?** No. The width difference means the chain won’t seat correctly, leading to rapid wear or failure.
**How many links do I need?** Count your old chain’s links, or check your owner’s manual. Most 520 chains come in 110, 112, or 120-link lengths and can be shortened.
**Is a 520 chain stronger than a 530?** Not in tensile strength. The 530 wins there. But the 520 is lighter and adequate for most middleweight bikes.
**How often should I replace it?** Every 15,000–20,000 miles