KastKing Spartacus II Plus Spinning Reel – IPX5 vs SHIMANO Sienna FG
Updated August 2026 — KastKing Spartacus II Plus Spinning Reel – IPX5 leads on waterproof and durability.
The KastKing Spartacus II Plus offers superior features and durability, making it the better choice for serious anglers. The Shimano Sienna FG is a solid budget option for casual fishing.
Why KastKing Spartacus II Plus Spinning Reel – IPX5 is better
Drag Power
KastKing has a maximum drag of 22 lbs compared to Sienna's 9 lbs.
Waterproofing
KastKing features IPX5 waterproof sealing.
Gear Ratio
KastKing has a specific gear ratio of 5.2:1.
Why SHIMANO Sienna FG is better
Weight
Sienna is lighter at 8.8 oz.
Price
Sienna is more affordable at $34.99.
Casting Design
Sienna has a propulsion spool lip for better casting.
Overall score
Specifications
| Spec | KastKing Spartacus II Plus Spinning Reel – IPX5 | SHIMANO Sienna FG |
|---|---|---|
| Brand | KastKing | SHIMANO |
| Waterproof | Yes | No |
| Ball Bearings | 7+1 | 0 |
| Line Capacity | Varies | Mono: 6/200 |
| Casting Design | Standard | Propulsion |
Dimension comparison
Price Comparison
The KastKing Spartacus II Plus Spinning Reel is priced at $48.99, making it about 40% more expensive than the Shimano Sienna FG, which retails for $34.99. This significant price difference can influence a buyer's decision, especially for those on a budget. The KastKing reel's higher price reflects its advanced features, such as its IPX5 waterproof sealing and a maximum drag of 22 pounds. In contrast, the Sienna FG offers a decent maximum drag of 9 pounds, which is suitable for lighter fishing applications. For anglers prioritizing cost, the Sienna FG presents a more economical choice without sacrificing quality.
Build Quality and Durability
In terms of build quality, the KastKing Spartacus II Plus excels with its IPX5 waterproof sealing and robust materials designed to withstand both freshwater and saltwater conditions. This reel incorporates four Everseal rings to block water, spray, and grit, ensuring long-lasting performance, especially in harsh environments. The Shimano Sienna FG, while reliable, does not feature the same level of waterproofing, which may concern those who fish in variable weather conditions. The KastKing's use of anodized aluminum for the spool enhances its durability and performance, making it a more resilient option for serious anglers.
Drag System Performance
The KastKing Spartacus II Plus offers a superior drag system with a maximum drag capacity of 22 pounds. This high drag power grants anglers the ability to handle larger fish effectively, making it suitable for various fishing styles, including saltwater applications. Conversely, the Shimano Sienna FG provides a maximum drag of 9 pounds, which is adequate for lighter species but may limit performance against larger catches. This difference in drag capability highlights the KastKing's suitability for serious fishing enthusiasts looking to target bigger species.
Gear Ratio and Retrieval
The gear ratio of the KastKing Spartacus II Plus is 5.2:1, providing a balanced approach to both speed and torque when reeling in fish. This ratio is effective for various species such as bass, walleye, and catfish, allowing anglers to have better control over their catch. The Shimano Sienna FG, with a line retrieval rate of 35 inches per crank, is designed for efficiency but does not specify its gear ratio. While the Sienna FG offers good line retrieval, the KastKing's specific gear ratio provides anglers with a clearer understanding of its performance capabilities.
Casting Distance and Line Management
Anglers seeking improved casting distance may favor the Shimano Sienna FG, which features a propulsion spool lip design that enhances casting distance while reducing the risk of backlashes and wind knots. This design can be particularly beneficial for novice anglers who may struggle with line management. In contrast, the KastKing Spartacus II Plus employs a patented anodized aluminum spool that promotes better line flow for longer casts. While both reels excel in casting, the Sienna FG offers a design advantage for those focused on maximizing casting performance.
Weight and Portability
The Shimano Sienna FG is lightweight, weighing in at only 8.8 ounces, which makes it an appealing option for anglers who prioritize portability and ease of handling during long fishing trips. The KastKing Spartacus II Plus does not specify its weight, but given its advanced features, it may be heavier than the Sienna FG. A lighter reel can reduce fatigue during extended fishing sessions, making the Sienna FG a more comfortable choice for casual anglers or those who prefer to travel light.
Brand Reputation and Sales Rank
Brand reputation plays a crucial role in consumer choices, and both KastKing and Shimano have established themselves in the fishing gear market. The KastKing Spartacus II Plus has a sales rank of 11,420, positioning it as a popular choice among buyers. Meanwhile, the Shimano Sienna FG, with a sales rank of 13,905, demonstrates its solid standing but shows it might be slightly less popular. Shimano's long-standing reputation in the fishing industry often sways buyers toward their products, while KastKing's innovative features attract a different segment of anglers.
Which should you buy?
Choosing between the KastKing Spartacus II Plus and the Shimano Sienna FG ultimately depends on your fishing needs and budget. The KastKing offers advanced features like IPX5 waterproofing, a high drag capacity of 22 pounds, and a versatile gear ratio at a price of $48.99. If you're seeking durability and performance for serious fishing, the KastKing is the better option. However, if you're on a budget and prefer a lighter, more portable reel for casual fishing, the Shimano Sienna FG at $34.99 provides excellent value with its reliable performance and user-friendly design. Consider your fishing style and preferences to make the best choice for your next fishing adventure.

