The Grover 502C Locking Tuners are well-regarded for their ease of installation, improved tuning stability, convenience during string changes, and compatibility with various guitar models. While there might be minor alignment issues during installation, the overall quality and performance of these locking tuners are highly appreciated by guitar enthusiasts.

In this review, I’ll share the results of my research to help you decide if these are the right tuners for your guitar.

At a Glance

Grover 502C Locking Tuners
Budget Option

Grover 502C Locking Tuners

  • Intended Instrument: Guitar
  • Configuration: 3+3
  • Finish: Chrome
  • Locking: Yes
  • Gear Ratio: 18:1
  • Peg Diameter: 0.391″ (peg hole)

Brian's Take: The Grover 502C tuners come in as my pick for best budget option. A great choice for replacement tuning machines, with strong scores in all areas and a great reputation among musicians. The 502Cs are very reasonably priced and a very solid option to consider.

  • Easy installation
  • Stability and control
  • Good aesthetic
  • Potential alignment issues
  • Standard aesthetics

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The Grover 502C tuning machines score high in this category. Something I love about them is that they don’t require extensive modifications to install. These are considered “drop-in” replacements, and that’ll save you a lot of hassle and frustration. In most cases, you won’t even need to pull out the drill.


With these being tuners, this is probably the most important category, and the Grovers score high once again. In my experience, tuning stability improved after switching these out. These things hold like Stallone in Cliffhanger, so you can trust them to not go out, no matter the genre you’re playing (looking at you, Zakk Wylde vibrato -emulators).

And, if you do find yourself having any issues with stability, word on the street is that Grover’s support is really good. I haven’t had to tap into that myself, but they have a good reputation for being responsive and helpful.


With an 18:1 gear ratio, you have a ton of control. I was able to make micro-adjustments and tune very accurately with these. They turn very smoothly and feel good in between your fingers. No complaints here, and this positive sentiment is echoed in the community. These not only hold tune well, but you can dial in comfortably and pinpoint your pitch right on the nose.


Nothing jumped out to me in terms of weight, so I think these are pretty standard in that sense. There might be a slight difference after making the replacement, but I personally can’t tell. When I wear my guitar, it isn’t lop-sided or anything – it sits where it normally does and still feels great.


Just like with weight, these are pretty standard in terms of appearance. I will say, however, that they come in alternate colors like black and gold, and you can get them in the “keystone buttons” style, which looks really cool and less vanilla. I also like how the keystones feel in my hand.

Are the Grover 502C Locking Tuners Right for You?

If you’re wondering whether the Grover 502C Locking Tuners are the right choice for your guitar, here’s a breakdown to help you make an informed decision.

Ideal Audience

The Grover 502C Locking Tuners are a fantastic option for a wide range of guitarists, spanning different skill levels and musical preferences. If you fall into any of the following categories, these tuners could be a perfect match for your needs:

  1. Performance-Driven Musicians: If you frequently perform on stage or in the studio, these locking tuners can enhance your playing experience by ensuring stable and accurate tuning throughout your performances.
  2. String Benders and Vibrato Users: Guitarists who often use techniques like string bending and vibrato will appreciate the enhanced tuning stability that the Grover 502C Locking Tuners provide. You can confidently dive into expressive playing without worrying about your guitar going out of tune.
  3. Easy Upgrade Seekers: If you’re looking for a hassle-free upgrade to your guitar without the need for major modifications, these “drop-in” replacement tuners are designed with your convenience in mind.
  4. Tone Enthusiasts: These tuners are compatible with a variety of guitar models, making them suitable for players who prioritize maintaining the tonal integrity of their instruments while benefiting from improved tuning stability.


The Grover 502C Locking Tuners are versatile and can be installed on various guitar types, including electric and acoustic guitars. While they are an excellent fit for most guitars, they are particularly well-suited for:

  • Electric Guitars: Whether you own a solid-body electric guitar or a semi-hollow model, the Grover 502C Locking Tuners can contribute to consistent tuning and reliable performance.
  • Acoustic Guitars: If you’re seeking to equip your acoustic guitar with tuners that enhance its tuning stability while preserving its natural acoustic qualities, these locking tuners are a suitable choice.

Aesthetic Considerations

When it comes to appearance, the Grover 502C Locking Tuners maintain a classic and timeless design. While they are available in alternate colors like black and gold, they retain a standard tuner look that complements a wide range of guitar styles and finishes. Additionally, the “keystone buttons” style adds a touch of sophistication to the tuners’ appearance, making them a tasteful choice for guitars with a traditional or modern aesthetic.

Final Thoughts

In conclusion, the Grover 502C Locking Tuners earn their place as a reliable enhancement for guitarists seeking an upgrade that doesn’t compromise on ease of installation, tuning stability, control, or visual appeal. Whether you’re a professional musician, a dedicated hobbyist, or someone venturing into the world of guitar, these tuners offer a practical and noticeable improvement to your playing experience.

If you’re still undecided, or interested in looking at other options, check out my post on the best Les Paul tuners.