Shimano Thunnus CI4 Spinning Reel Review

Last Updated: 13.08.20

Lightweight yet equipped with the power to stop big fish, the Shimano Thunnus CI4 Spinning Reel seemingly works against the laws of nature. Anglers are assured that this fishing reel has the latest technology boasting fantastic durability, superb performance and reliable functionality, all in a single package. It can handle virtually any live-bait application including inshore species and bluewater ones. Taking inspiration from the bicycle division of Shimano, the Thunnus CI4 uses carbon materials to provide more than enough power during high impact situations. Solid yet lightweight, this fishing reel is engineered for all anglers who would love to have an easy-to-use piece of equipment with the functionality they want but minus the added heft to carry revolutionary features.

1.Shimano Thunnus CI4


Our Review


The Reel: Construction and Performance

Designed to be 7 ounces lighter than its predecessor, the Thunnus CI4 offers uncompromised power despite shedding some weight. It boasts new drag systems for the baitrunner and main drag. This is the most efficient live bait and best surf fishing reel you can ever find on the market today. It offers matchless adjustability so you can fish any bait under any condition. Offering smooth stopping power, this model is a top-of-the-line piece of equipment in the generation it belongs to. This fishing reel is engineered to be the brand’s premier baitrunner fishing system on the market. It is made with the revolutionary CI4 material that allows the removal of 7 to 10 ounces of weight compared to the original Thunnus.

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Peerless adjustability

Faithful to the Thunnus generation of spinning reels, the unit is the most efficient live bait spinning reel you can find on the market, delivering peerless adjustability so you can fish any bait under any condition. It provides awesomely smooth stopping power that today’s current generation of Thunnus reels is recognized for. The CI4 in the product name denotes Carbon Interfusion, and the notation ‘4’ signifies the number of electrons carried by the carbon atom. This designates the fishing reel as being equipped with reinforced carbon fiber, which makes the unit over 1 ½ times stronger compared to the brand’s standard XT-7 graphite while boasting over 20 percent lighter weight.

This fishing reel does not incorporate metal in its construction, making it resilient to rust. All the weight reduction and strength results in an awesomely lightweight reel equipped with superbly precise tolerances.

2.Shimano Thunnus CI4


Impressively smooth stopping power

Boasting smooth stopping power, this fishing reel also features Shimano’s Paladin Gear Durability Enhancement. This particular technology employs a special cold forged aluminum drive gear plus a hardened brass pinion gear, enabling the fishing reel to retain its out-of-the-box smoothness that lasts a lot longer than before. The fishing reel employs a combination of metals that is greatly stronger than any drivetrain entirely constructed of stainless steel.


Efficient propulsion line management

Boasting Shimano’s smooth functioning, this fishing reel also boast Shimano’s effective propulsion line management technology that uses the new propulsion spool lip design. This clever technology has undergone thousands of casting tests along with computer simulations to ensure that it can deliver farther casting distances compared to a standard spool lip design. All this is while efficiently limiting annoying backlashes and the formation of wind knots. The line smoothly winds off the spool in smaller loops when you cast, and this guarantees decreased incidences of slap on the stripper guide. A long stroke design is also employed by the propulsion spool, which results in greater enhancement of your casting distance and style.


Trouble-free performance

The Thunnus CI4 offers years of longer distance casting and trouble-free performance every time. When taken together with the greatly reduced weight, these elements make fatigue a simple thing of the past. This fishing reel is primarily designed for free lining live bait along gulf coasts and eastern seaboards> This fishing reel from Thunnus will become an integral part of tomorrow’s stronger, lighter and more powerful technical fishing systems. It can handle lure weights ranging from 12.7 to 27.7 ounces. This model has a high number of bearings at 6 + 1, ensuring freedom from bird’s nests and a consistently smooth loading and unloading performance every time.

3.Shimano Thunnus CI4


Instant anti-reverse

This fishing reel features Super Stopper II anti-reverse technology, which uses a one-way bearing configuration to eliminate back play. The angler is thus provided instant hook setting power. This piece of gear also comes equipped with stainless steel ball bearings that have undergone the special A-RB treatment process, rendering them at least ten times more resistant to corrosion compared to stainless steel ball bearings. The bearings on this unit also require less maintenance and higher bearing speed, thanks to their no-shield design that enables easy removal of debris as well as effortless lubrication, requiring lubricants of lighter viscosity to reduce friction and enable the bearings to spin longer and more quickly.


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