Detail 01
18:1 gear ratio
Provides a greater range of adjustment per string for controlled tuning changes.
Product detailSKU #1500000429394
GroverSuper Rotomatics With 18:1 Gear Ratio 109-18 Series Tuning Machines Nickel
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Independent shopping perspective
The Korena take
Grover’s nickel Super Rotomatics 109-18 Series tuning machines pair an 18:1 ratio with sealed, lubricated gearboxes for controlled tuning adjustments and stable pitch. The enclosed gearing protects the working mechanism while you tune. With a 25/64-inch post hole, 28.2 mm post length, and drop-in-compatible design, they are a practical replacement option when those measurements and mounting arrangement match your instrument.
Strong match
Who this is for
- Replacing compatible tuners when you want the finer adjustment range of an 18:1 gear ratio.
- Players who prefer sealed, lubricated tuning gears for routine tuning adjustments.
Consider the trade-offs
When to look elsewhere
- Instruments whose tuner layout or measurements do not match the 109-18 Series drop-in design.
- Installations requiring a post hole other than 25/64 inch or a different 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 gears enclosed and protected.
Final check
Know before you order
- 01Check that your instrument matches the 109-18 Series drop-in arrangement.
- 02Confirm the 25/64-inch post hole and 28.2 mm post length work for your instrument.
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.
02Are the gears enclosed?
Yes. The lubricated gears are housed in sealed gearboxes.
