KastKing Spartacus II Baitcasting Fishing Reel, vs SHIMANO Sienna FG
Updated July 2026 — KastKing Spartacus II Baitcasting Fishing Reel, wins on drag and ball bearings, SHIMANO Sienna FG wins on retrieve and weight.
The KastKing Spartacus II offers superior drag strength and lightweight design, making it a better choice for serious anglers, while the Sienna FG is a more budget-friendly option with decent features.
Why KastKing Spartacus II Baitcasting Fishing Reel, is better
Drag Strength
Spartacus II has a 17.6 lb drag compared to Sienna FG's 9 lb.
Weight
Spartacus II is lighter at 6 oz versus Sienna FG's 8.8 oz.
Smoothness
Spartacus II features 7 + 1 ball bearings for smoother operation.
Why SHIMANO Sienna FG is better
Price
Sienna FG is approximately 9% cheaper than Spartacus II.
Casting Distance
Sienna FG has a propulsion spool design for longer casts.
Line Capacity
Sienna FG supports various line weights for versatility.
Overall score
Specifications
| Spec | KastKing Spartacus II Baitcasting Fishing Reel, | SHIMANO Sienna FG |
|---|---|---|
| Brand | KastKing | SHIMANO |
| Model | Spartacus II | Sienna FG |
| Max Drag | 17.6 lb | 9 lb |
| Weight | 6 oz | 8.8 oz |
| Gear Ratio | 7.2:1 | 5.2:1 |
| Line Capacity | N/A | 6/200 |
Dimension comparison
Overview of the KastKing Spartacus II and Sienna FG
The KastKing Spartacus II and Sienna FG are two compelling options in the fishing reel category, catering to different preferences and fishing styles. The KastKing Spartacus II is priced at $38.39, while the Sienna FG is slightly cheaper at $34.99, making it about 9% less expensive. Both reels offer unique features that appeal to anglers, but their designs and specifications set them apart in notable ways.
Design and Build Quality
The KastKing Spartacus II boasts a sleek lower profile design at just 39 mm, making it about 10% lower than its predecessor, the Spartacus I. Weighing in at only 6 ounces, it is designed for comfort and ease of use during long fishing sessions. In contrast, the Sienna FG weighs 8.8 ounces and adopts a more traditional reel design. While both reels are crafted with functionality in mind, the Spartacus II’s ultralight build may be a significant advantage for those who prioritize lightweight gear.
Drag System Performance
When it comes to drag systems, the KastKing Spartacus II offers an impressive 17.6-pound carbon fiber drag, which is suitable for handling larger trophy fish. This powerful drag system is designed for performance and reliability in various fishing scenarios. The Sienna FG, on the other hand, has a max drag of 9 pounds. While this is adequate for many fishing applications, it may present limitations when targeting larger species. The significant difference in drag strength highlights the Spartacus II as a more robust option for serious anglers.
Casting Distance and Control
The Sienna FG features a propulsion spool lip design that enhances casting distance while minimizing the risk of backlashes and wind knots. This design is particularly beneficial for anglers looking to achieve longer casts with greater accuracy. The KastKing Spartacus II, while focused on smooth operation, does not specifically emphasize casting distance in its features. However, its efficient design aims to reduce line friction, which can also aid in achieving better casting control. Each reel has its strengths in this area, but the Sienna FG may appeal more to those needing extended casting capabilities.
Line Capacity and Versatility
In terms of line capacity, the Sienna FG can accommodate various line weights, with a mono line capacity of 6/200, 8/140, and 10/120, and a PowerPro line capacity of 10/150, 15/145, and 30/100. This versatility makes it suitable for different fishing conditions and preferences. The KastKing Spartacus II does not specify line capacity, focusing instead on its advanced braking and drag systems. Therefore, for anglers who prioritize line capacity for various fishing scenarios, the Sienna FG may be the more versatile choice.
Smoothness and Handling
The KastKing Spartacus II is equipped with 7 + 1 corrosion-resistant ball bearings, which contribute to its smooth performance and ease of handling. This feature is designed for anglers who value smooth operation, especially during casting and retrieval. The Sienna FG also provides a smooth retrieval experience with 35 inches of line retrieve per crank, but it does not specify the number of ball bearings. For anglers looking for a reel that excels in smoothness, the Spartacus II appears to have a slight edge.
Price Considerations
The KastKing Spartacus II is listed at $38.39, whereas the Sienna FG is priced at $34.99, making the Sienna FG approximately 9% cheaper. While price is often a significant factor in purchasing decisions, it's essential to weigh the features and performance capabilities against the cost. The Spartacus II, with its superior drag system and lightweight build, might justify the higher price for serious anglers, while the Sienna FG presents a more budget-friendly option for casual fishing.
Which should you buy?
Choosing between the KastKing Spartacus II and the Sienna FG ultimately depends on your specific fishing needs and preferences. If you prioritize lightweight design, superior drag strength, and smooth performance, the KastKing Spartacus II may be the better choice despite its higher price. Conversely, if budget is a primary concern and you value casting distance and versatility, the Sienna FG offers solid features at a lower price point. Ultimately, both reels can serve anglers well, but understanding their differences will help you make the best decision for your fishing adventures.

