Detail 01
18:1 gear ratio
Allows fine pitch adjustments at the tuner.
Product detailSKU #1500000429390
GroverSuper Rotomatics With 18:1 Gear Ratio 109-18 Series Tuning Machines Chrome
Independent shopping perspective
The Korena take
The Chrome Grover Super Rotomatics 109-18 set uses an 18:1 ratio to make pitch changes in smaller increments. Its lubricated gears sit inside sealed gearboxes, and the posts are specified for a 25/64-inch hole with a 28.2 mm length. It is positioned as a drop-in replacement within the 109-18 series, provided the instrument matches those mounting details.
Strong match
Who this is for
- Updating compatible 109-18-series guitar tuners while retaining a Chrome hardware finish.
Consider the trade-offs
When to look elsewhere
- Instruments whose tuner mounting does not match the stated post-hole or post-length dimensions.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
25/64-inch post hole and 28.2 mm post length
These are the stated post dimensions to compare during replacement planning.
Final check
Know before you order
- 01Verify the existing tuner dimensions before relying on the drop-in replacement claim.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What ratio do the 109-18 machines use?
They use an 18:1 gear ratio.
02Are the gears enclosed?
Yes. The lubricated gears are housed in sealed gearboxes.
