Detail 01
18:1 gear ratio
Supports fine pitch and string-tension adjustment.
Product detailSKU #1500000429367
GroverRotomatics With 18:1 Gear Ratio 102-18 Series Keystone Button Tuning Machines Nickel
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Independent shopping perspective
The Korena take
Grover Rotomatics 102-18 Series tuning machines pair keystone buttons with an 18:1 gear ratio for fine string-tension adjustment. Their enclosed gearbox holds specially lubricated gears intended to turn smoothly and silently, while the countersunk tension screw lets you set tension to your preference. These nickel tuning machines are described as dropping into the holes on most popular guitar and bass models, making them a practical option when replacing compatible hardware.
Strong match
Who this is for
- Guitar or bass hardware updates where the existing holes match these Rotomatics.
- Players who want fine string-tension adjustment through an 18:1 gear ratio.
- Performance setups where smooth, silent gear operation is a priority.
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
Enclosed gearbox with lubricated gears
The gears are contained and designed to turn smoothly and silently.
Detail 03
Countersunk tension screw
Lets you adjust string tension to your preferred setting.
Final check
Know before you order
- 01Confirm your instrument’s holes are compatible; these are described as drop-in for most popular guitar and bass models.
- 02Nickel is the listed finish.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What is the gear ratio?
These Rotomatics use an 18:1 gear ratio.
02Can I adjust the tension?
Yes. A countersunk tension screw allows string-tension adjustment.
03What instruments are they designed to fit?
They are described as dropping into the holes on most popular guitar and bass models.
