19 Caius B
Shimano2019

Shimano 19 Caius B Tuning

Tuning Specs
Handle bore 7x4
Spool bearing sizes 3x10x4 | 3x10x4
Recommended bearing class Apex
These sizes are precisely tailored to the reel — we’ve deliberately hidden the others so you can find the right tuning parts straight away.
Recommended knob sizes
18–20 mm21–24 mm25–27 mm
Recommended handle lengths
90–105 mm
Let’s tune your reel
Available variants
150 HG R
151 HG L

Matching tuning parts for your Caius

Recommended for your Caius
  • LEGENDARY  ★ 100+
  • NEW
RL - Angelrollentuning - APEX Spulenlager Set für Shimano Caius - CAIUS 24 C - RL-TNG APEX spool bearings with S30 ceramic balls, ABEC 9
  • STAR PRODUCT  ★ 50+
  • NEW
RL - Angelrollentuning - EDGE Spulenlager Set für Shimano Caius - CAIUS 24 C - Mit Abdeckung - RL-TNG EDGE Spool Bearing Set open without shield: two hybrid ceramic ball bearings
  • POPULAR  ★ 20+
  • NEW
RL - Angelrollentuning - CORE Spulenlager Set für Shimano Caius - CAIUS 24 C - RL - Angelrollentuning - RL - TNG Stainless Steel Ball Bearing Set | ABEC 5 | Shimano | 5x11x4 | 3x10x4 - Bundle -
  • LOW STOCK
Two metal ball bearings from the Hedgehog Studio "Kattobi" Tuning Kit Ceramic Ball Bearings for Shimano 1030 & 1030 Air are shown side by side on a plain white background, each with a visible inner ring of balls.
  • LOW STOCK
Two round red wheels with visible metal bearings, resembling the Hedgehog Studio "Kattobi" Tuning Kit ball bearings for Shimano Air BFS 1030 & 1030, against a white background.
  • LOW STOCK
Two ball bearings from the Hedgehog Studio "Kattobi" Tuning Kit (Shimano Air BFS-Si Ceramic 1030 & 1030) are shown side by side with "AIP BFS-SI", "1030AIR BFS-SI" and a Hedgehog Studio banner, perfect for upgrades.

The Shimano 19 Caius B is an entry-level baitcaster with an S3D aluminum spool, Super Free Spool, and VBS brake (6-pin centrifugal). Available as 150 HG (right-handed) and 151 HG (left-handed), gear ratio 7.2:1.

Frequently asked questions about tuning the Shimano 19 Caius B

Which spool bearings fit the Shimano 19 Caius B?
The Shimano 19 Caius B uses spool bearings in 3x10x4 (both spool bearings the same size) (inner × outer × width in mm). You'll find matching tuning spool bearings in exactly this size on this page under the tuning parts.
Which bearing class do we recommend for the 19 Caius B?
For the Shimano 19 Caius B we recommend APEX, our highest tuning level. It gets the maximum casting distance and smoothness out of the reel and is especially worth it if you cast light lures or want every last bit of performance. The recommendation is based on how this reel is typically used.
Which handle and knobs fit the 19 Caius B?
The handle fitting of the Shimano 19 Caius B is 7x4 (wrench size × shaft diameter in mm). Every tuning handle with a 7x4 fitting fits directly. Tuning knobs in the sizes shown on this page fit the stock handle and our tuning handles.
Can you install the tuning on my 19 Caius B?
Yes. Send us your Shimano 19 Caius B, we'll install the tuning parts professionally, clean and oil the reel and send it back ready to fish. You'll find the tuning service via the button above.