## 520 Chain Dimensions: Complete Size & Specification Guide
If you ride a motorcycle, you have likely heard about the **520 chain dimensions**. This guide breaks down everything you need to know about this popular chain size. Whether you are replacing a worn chain or converting your bike, understanding these specifications ensures the right fit and top performance.
### What Does 520 Mean?
The number “520” is a standard size code used worldwide. The first digit “5” refers to the **chain pitch**, which is 5/8 of an inch (15.875 mm). The last two digits “20” indicate the **roller width** and overall chain width. This sizing system helps riders accurately match a chain to their sprockets. Getting this right prevents premature wear, reduces noise, and keeps your bike running smoothly.
### **520 Chain Dimensions: Complete Size Breakdown**
Let’s look at the exact measurements for a standard 520 chain. These numbers are critical for compatibility.
– **Pitch:** 15.875 mm (5/8 inch)
– **Roller Diameter:** 10.16 mm (0.400 inch)
– **Inner Width:** 6.35 mm (0.250 inch)
– **Pin Diameter:** 5.08 mm (0.200 inch)
– **Outer Plate Thickness:** 2.0 mm (approx.)
– **Weight:** Roughly 1.5-1.8 kg per 100 links
These **520 chain dimensions** make it lighter and narrower than a 530 chain, but stronger than a 428 chain. It is a popular choice for many modern sportbikes and dirt bikes.
### **Why These Specifications Matter**
Every measurement affects how the chain performs. **Pitch** determines how the chain meshes with your sprocket teeth. **Roller diameter** and **inner width** ensure a proper fit on the sprocket. If the dimensions are off, you risk rapid wear, chain slippage, or even breakage.
A 520 chain is a great balance of weight savings and strength. Many riders choose it for track bikes because reducing unsprung weight improves suspension response. For trail riders, its narrow profile resists mud packing better than wider chains.
### **520 vs 525 vs 530**
How does 520 compare to other common sizes?
– **520:** 5/8″ pitch, narrow, light
– **525:** Same pitch, wider rollers and plates
– **530:** Same pitch, widest and heaviest
A 530 chain often lasts longer on big touring bikes, but the 520 offers less drag and lighter weight. If your bike came with a 520, do not switch to a wider size without checking clearance. Conversely, converting from 530 to 520 is common for performance gains, but you must also change sprockets.
### **How to Measure Your Current Chain**
Before buying a replacement, verify your current size. Look for a stamp on the side plates—it usually says “520.” If the stamp is worn off, measure the pitch between two pins. A 520 chain will have a 5/8 inch spacing. You can also count the number of links, but this doesn’t confirm the size.
For a complete visual guide on sizing, check out this detailed explanation of 520 chain dimensions. It covers pitch, roller width, and how to match chains and sprockets correctly.
### **Choosing the Right 520 Chain**
Not all 520 chains are the same. Look for these features:
– **Tensile strength:** Higher for big bikes, lower for small dirt bikes
– **O-ring or X-ring:** Sealed chains last longer on street bikes
– **Clip or rivet master link:** Clip is easier for trailside repairs;
