Avail Microcast Spool for Shimano 21 SLX BFS – Your upgrade for ultra-light casts!
🎣 For finesse fanatics & precision freaks!
Welcome to the Champions League of Bait Finesse Performance! 🚀 With the Avail Microcast Spool you transform your Shimano 21 SLX BFS & 17 Scorpion BFS into a high-precision machine for light lures and perfect casts.
What does it bring you? Butter-smooth casts with light jigs, weightless rigs or finesse setups – no jerking, no "Come on, fly already!" frustration. This spool simply makes your life better.
🔧 Two spool depths – choose your setup!
✔ 21SLX15R (1.5 mm spool depth) – Ideal for 4-6 lb fluorocarbon or PE lines
💡 Perfect for: Drop shot, Neko rig, ultralight hardbaits
✔ 21SLX29R (2.9 mm spool depth) – For 10-12 lb lines & slightly heavier rigs
💡 Perfect for: Texas rigs (3.5-9 g), small jigs, chatterbaits
➡️ In short: The flatter the spool, the lighter the line and finer the tackle. The deeper the spool, the more line capacity for all-round setups.
🔧 Technical data – tuning in perfection!
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Material:
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Spool: Super Duralumin (anodized) – ultralight & super stable
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Axle: Stainless steel – for maximum durability
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Compatible reels:
- Shimano 21 SLX BFS (HG/XG, Left & Right)
- Shimano 17 Scorpion BFS (HG/XG, Left & Right)
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Ball bearing size: 8 mm x 4 mm x 3 mm
⚖ Weight – Where every gram counts!
Spool |
Weight |
Ratio to original spool |
21SLX15R |
8.1 g |
91,0 % |
21SLX29R |
8.4 g |
94,4 % |
Original spool (21 SLX BFS) |
8.9 g |
100 % |
📌 What does that mean for you?
🔹 Less weight = faster rotation = silky smooth casts
🔹 More sensitivity = perfect lure feel
🔹 Lower starting inertia = even 1 g lures fly effortlessly
🎣 Line capacity – Which one suits you?
Spool |
PE 0.6 |
PE 0.8 |
21SLX15R |
80 m |
- |
21SLX29R |
- |
130 m |
Original spool |
130 m |
130 m |
📌 Important to know:
- Actual capacity may vary depending on line type (nylon, fluorocarbon, PE) & winding tension.
- If you fish PE: Use the 15R for ultra-light techniques, the 29R for all-round finesse.
🚀 Why the Avail Microcast Spool 21 SLX BFS?
✅ Ideal for bait finesse – effortlessly cast ultra-light lures!
✅ Lighter than the original spool – more control, better performance!
✅ Perfect brake control thanks to magnet upgrade!
✅ Two spool depths – You decide your setup!
✅ Plug & Play – Install, cast, enjoy!
🔧 Installation & important tips
🛠 Additional magnets recommended for model 21SLX15R!
- Due to the flat design, the brake sits further away, which leads to less braking effect.
- Solution? Simply add 4 x 1 mm additional magnets (up to 8 pieces, sold separately) onto the existing ones – and the finesse dream setup is ready!

⚠ Avoid "thumbing" on the spool edge!
- Pressing directly on the edge can damage the anodizing.
- Instead, always stop on the winding surface!
⚠ Spool line with care!
- Especially do not wind too tight with nylon – otherwise there will be unsightly pressure marks.
⚠ Check & oil ball bearings!
- Factory treated with rust protection grease – degrease & lightly oil before first use for perfect performance!
🔥 Conclusion – Is the Microcast Spool the upgrade for you?
👑 If you…
✅ want to cast ultralight lures without your reel acting up
✅ want a lighter, more precise casting performance
✅ want to optimize your brake control
✅ looking for a perfectly tuned finesse spool
🎣 Then the Avail Microcast Spool 21 SLX BFS is your perfect tuning!
🔧 Turn your SLX BFS into a casting machine – and enjoy the Bait Finesse experience in perfection! 🎣🔥