The Grover Rotomatics 18:1 Gear Ratio 102-18 Series Machine Heads offer a significant upgrade to one of the most iconic tuning designs in guitar history. 

While maintaining the exact housing and classic silhouette of the original Rotomatic, this version features improved internal gearing for a more refined user experience.

Smoother Gearing Without Backlash

The move to an 18:1 gear ratio provides much finer control over tuning compared to standard lower-ratio tuners. 

This higher ratio allows for more incremental adjustments, making it easier to find and hold the perfect pitch. 

The updated gears are designed for smoother operation and higher backlash elimination, ensuring that once you reach the desired note, the string stays locked in place. 

The gears are also sealed and permanently lubricated, protecting them from dust and wear for a lifetime of maintenance-free performance.

Seamless Installation

Designed as a direct drop-in replacement for a wide range of Grover series, including the 102 and 502 lines, these machine heads make upgrading your guitar straightforward. 

The set is configured for 3+3 headstocks and includes all the necessary mounting hardware, such as bushings, washers, and wood screws. 

With a standard 25/64-inch post hole requirement and a robust weight of 1.6oz per tuner, they provide a solid, high-mass feel that can contribute to improved sustain and headstock stability.

Grover Rotomatics 18:1 Gear Ratio 102-18 Series Features and Specifications

• 18:1 gear ratio for exceptionally fine tuning and enhanced stability

• Sealed-in lubricated gears for smooth operation and long-term durability

• Improved backlash elimination for more accurate pitch retention

• Chrome finish with the original Rotomatic housing design

• Fits standard 25/64 inch (approx. 10mm) diameter post holes

• Post length of 23mm to the hole with an overall length of 28.2mm

• Set of six machine heads in a 3+3 configuration

• Supports string gauges up to .074 for versatile setup options

• Direct drop-in replacement for Grover 102, 102V, 103, 106, 109, and 502 series

• Complete mounting hardware including bushings, washers, and screws included