Detail 01
18:1 gear ratio
Provides more adjustment range while bringing each string to pitch.
Product detailSKU #1500000429388
GroverSuper Rotomatics With 18:1 Gear Ratio 109-18 Series Tuning Machines Black Chrome
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Independent shopping perspective
The Korena take
Grover’s 109-18 Super Rotomatics are guitar tuning machines built around an 18:1 ratio for controlled pitch adjustment. Their sealed, lubricated gearboxes keep the mechanism enclosed, while the 25/64-inch post hole and 28.2 mm post length define the installation dimensions. The Black Chrome version is intended as a drop-in 109-18-series replacement when those measurements suit the instrument.
Strong match
Who this is for
- Replacing 109-18-series tuning machines when the existing post-hole and post-length measurements match.
Consider the trade-offs
When to look elsewhere
- Instruments whose tuner layout does not accept the stated 25/64-inch post hole or 28.2 mm post length.
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
Sealed, lubricated gearbox
Keeps the lubricated gearing enclosed.
Final check
Know before you order
- 01Check the instrument’s tuner dimensions against the 25/64-inch post hole and 28.2 mm post length.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What gear ratio do these tuning machines use?
They use an 18:1 gear ratio.
02What finish is this version?
This version is Black Chrome.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Black
