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Spool Bearing Differences – Core vs Edge vs Apex Compared
Spool Bearing Differences – Core vs Edge vs Apex Compared
Our spool bearings differ in material composition, ball quality, cage system, ABEC precision class, and optimal tuning for your casting weight. Each class is designed for a specific application. The decisive factor is not just the ABEC rating, but the entire construction and its tuning to your setup.
Apex – ABEC 9 with S30 Ceramic Balls and PEEK Ribbon Cage
Apex bearings are our uncompromising high-performance option. They consist of ABEC 9 precision-made stainless steel rings, equipped with S30 ceramic balls and a PEEK (Polyether Ether Ketone) ribbon cage.
S30 ceramic balls enable extremely low friction and very high speeds. The PEEK ribbon retainer is a high-performance cage that ensures stability, temperature resistance, and reliable ball guidance at very high speeds.
- ABEC 9 precision standard
- S30 ceramic balls for maximum rotational pleasure
- PEEK ribbon cage for stability at high speeds & minimal friction
- Very fast spool acceleration
Thanks to this design, the spool of your baitcasting reel starts very quickly and reaches extremely high speeds, especially in the lower casting weight range.
Sweet spot casting weight: 2 to 60 g
If you mostly fish well above this range, a slightly more robustly tuned design makes sense. In this case, switching to the Edge class is recommended.
Edge – ABEC 9 Hybrid Ceramic Bearings with S25 Balls
Edge bearings are also based on an ABEC 9 precision standard. They use S25 ceramic balls combined with precision-made steel rings and a Japanese ribbon retainer.
Compared to Apex, Edge is tuned to be a bit more versatile. The design offers high speed capability combined with more mechanical stability for a broader range of applications.
- ABEC 9 precision standard
- S25 ceramic balls for high speeds
- Japanese ribbon retainer for stable ball guidance
- Balanced performance tuning
Edge bearings are available in two variants:
- With Orange Seal: Additional protection against dirt and moisture
- Without Seal: Minimal resistance for maximum rotational pleasure
Sweet spot casting weight: 5 to 100 g
If your setup regularly exceeds this range significantly, the Core class is the technically more suitable choice.
Core – ABEC 5 Stainless Steel Bearings for High Load
Core bearings consist of ABEC 5 precision-made stainless steel bearings with a stable ball and cage construction. They are designed for durability, continuous use, and consistent performance.
ABEC 5 here does not mean lower quality but a more robust tuning compared to high-speed hybrid ceramic bearings.
- ABEC 5 precision standard
- Robust stainless steel construction
- High mechanical load capacity
- Consistent performance under load
Sweet spot casting weight: 8 g to over 200 g
The Casting Weight Decides
All our spool bearings are high-quality manufactured and designed for high speeds. The crucial difference lies in the tuning to your actual lure spectrum.
Those who mostly fish very light lures benefit from maximum startup dynamics. Those covering a broader spectrum should choose a more versatile tuning. Those who consistently cast heavy should rely on robust stability.
The best performance arises when bearing class and casting weight match.
RL-TNG Complete Ball Bearing Tuning Kit for Shimano Aldebaran DC 31
RL-TNG Complete Ball Bearing Tuning Kit for Shimano Aldebaran DC 31
11 Bearings, 4 classes, each position equipped with the class needed there.
Construction and Material
In the Spool sit two APEX Spool Bearings with S30 Hybrid Ceramic Balls at ABEC 9 level, the core of this upgrade. They deliver the most noticeable performance gain in the new Aldebaran DC: extremely fast spool start, maximum free spool, perfectly tuned to the digital control brake system. On the Wormshaft, an EDGE Bearing at ABEC 9 level with S25 Hybrid Ceramic Balls and Japanese ribbon retainer replaces the factory plastic bushing. The Piniongear gets an EDGE OPEN Bearing without seal for easier running in the gear. At the gear support positions, two more EDGE Bearings provide more direct power transmission, and at the drive gear support, an EDGE OPEN provides stable support in the drive. The four knob positions run on CORE with stainless steel balls, where stability is more important than speed.
Scope of delivery
- 2× APEX Spool Bearings with S30 Hybrid Ceramic for extremely fast spool start and maximum free spool
- 1× EDGE OPEN Wormshaft Bearing with S25 Hybrid Ceramic, replaces the factory plastic bushing
- 1× EDGE OPEN Piniongear Bearing without seal for easier running in the gear
- 2× EDGE Gear Support Bearings for more direct power transmission
- 1× EDGE OPEN Drivegear Support Bearing for stable support in the drive
- 4× CORE Knob Bearings for play-free, controlled cranking
Performance Characteristics
Noticeable on the first cast. The spool starts earlier, runs longer, responds to every impulse from the rod tip, and extracts additional casting distance from the DC brake system. Wormshaft and gear run quieter, the knob turns without noticeable play.
Recommended Application
Classic light to finesse range from 4 to 21 g: small to medium wobblers, crankbaits, light spinnerbaits, drop shot, Texas rig, and finesse jigs.
Good to Know
Ceramic spool bearings run somewhat louder due to the material than pure stainless steel bearings; this is due to the higher hardness of the ceramic balls and is not a quality defect but a property of the material. With the appropriate spool bearing oil, the running noise can be noticeably reduced.
Compatibility
Fits all variants of the Shimano Aldebaran DC 31 (2025): HG and XG, each in left- and right-hand versions. The complete model overview is available in the Compatible Baitcaster tab.
