Thunnus CI4 Spinning Reel
Seemingly against the laws of nature, lightweight with the power to stop big fish are not words commonly found together in a sentence. Thunnus CI4 takes a page from Shimano’s bicycle division and uses carbon materials in high-impact situations in response to anglers wanting a reel with bait-running functionality but in a lightweight body. Thunnus CI4 is up to 7 ounces lighter than its predecessor without sacrificing any power and incorporates new drag systems for the main drag as well as the baitrunner drag. Thunnus CI4 is the most efficient live bait spinning reel on the market with unmatched adjustability for fishing live bait in any condition while still having the smooth stopping power.
Key Features
| Feature | Detail |
|---|---|
| Material | Carbon fiber in high-impact areas |
| Weight | Up to 7 ounces lighter than predecessor |
| Drag System | Improved main drag and baitrunner drag |
| Design Focus | Optimized for live bait fishing with high adjustability |
FAQ
What makes the Thunnus CI4 different from previous models?
The Thunnus CI4 uses carbon fiber in high-impact areas to reduce weight by up to 7 ounces while maintaining strong stopping power. It features improved main drag and baitrunner drag systems for better performance when fishing live bait.
Is the Thunnus CI4 suitable for live bait fishing?
Yes, the Thunnus CI4 is specifically designed for live bait fishing with unmatched adjustability and smooth stopping power, making it one of the most efficient reels for this application.
Does the Thunnus CI4 offer better drag control?
Yes, it includes a new drag system for both main drag and baitrunner drag, allowing for precise control during live bait fishing.




Dan Thomson –
I’ve used the Thunnus CI4 for several live bait sessions and it’s noticeably lighter than the previous model. The drag system is responsive and easy to adjust. It handles fast-moving bait without losing control, which is exactly what I needed.
Leah Parsons –
The carbon construction makes it feel solid and lightweight. I’ve fished in various conditions and the baitrunner drag works smoothly. It’s a significant improvement over older reels in terms of adjustability and performance.
Christopher Hemmings –
Great for live bait fishing. The weight reduction is noticeable and the drag system is more precise. A bit more complex to set up initially, but worth the effort for consistent results.