# **How to Choose Rio Fly Line Backing Line 20lb or 30lb 100 yd for Trout and Salmon Lines**
As an angler, selecting the right backing line is crucial for a successful fishing experience, especially when targeting trout and salmon. The **Rio Fly Line Backing Line** is a top-tier choice, known for its durability and performance. However, choosing between the **20lb and 30lb, 100-yard options** can be challenging. In this guide, we’ll break down the key factors to help you make the best decision for your fly fishing setup.
## **Understanding Backing Line Basics**
Backing line serves two primary purposes:
1. **Provides Extra Line Capacity** – Fly reels have limited space, and backing allows you to store more line in case a strong fish makes a long run.
2. **Acts as a Safety Net** – If a fish takes out your entire fly line, the backing prevents break-offs by giving you extra length to fight the fish.
For trout and salmon fishing, where powerful runs are common, choosing the right backing strength is essential.
## **20lb vs. 30lb Rio Backing: Key Differences**
### **1. Strength & Fish Species**
– **20lb Backing**: Ideal for **smaller trout** and **moderate-sized salmon**. It offers sufficient strength while maintaining a thinner diameter, allowing more line capacity on your reel.
– **30lb Backing**: Better suited for **larger salmon** (such as Chinook or Atlantic salmon) and **strong-running fish**. The increased strength reduces the risk of breakage when battling aggressive fish.
### **2. Reel Capacity & Line Thickness**
– **20lb backing** is thinner, meaning you can fit more yards on your reel—beneficial if you need extra length for long-distance runs.
– **30lb backing** is thicker, so you may sacrifice some yardage, but the added strength is worth it for hard-fighting salmon.
### **3. Fishing Conditions**
– **Fast rivers & strong currents**: A **30lb backing** is recommended since salmon in these conditions often make powerful, sustained runs.
– **Smaller streams & still waters**: **20lb backing** is usually sufficient, as trout runs are less extreme.
## **Which One Should You Choose?**
### **For Trout Fishing**
– If targeting **small to medium-sized trout**, the **20lb Rio Backing** is perfect—it maximizes reel capacity while providing enough strength.
– For **larger trout (like steelhead or sea-run browns)**, consider **30lb backing** if they are known for strong runs.
### **For Salmon Fishing**
– **Pink, Coho, or smaller Atlantic salmon**: **20lb backing** works well in most cases.
– **Chinook, large Atlantic salmon, or fish in heavy currents**: **30lb backing** is the safer choice to prevent break-offs.
## **Final Thoughts**
Both the **Rio Fly Line Backing 20lb and 30lb** are excellent choices, but your selection should depend on:
✅ **Target species & size**
✅ **Fishing environment (fast rivers vs. calm waters)**
✅ **Reel capacity & desired line length**
If you primarily fish for **trout and smaller salmon**, the **20lb, 100-yard backing** is a versatile option. However, if you’re chasing **big, hard-fighting salmon**, the **30lb backing** provides the extra security needed.
At **KyleBooker**, we recommend testing both in different conditions to see which fits your style best. Tight lines and happy fishing!
Would you like recommendations on the best reels to pair with these backing lines? Let us know in the comments! 🎣