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4 String 2+2 Bass Ratio Y-Style Button (PRB-4220, Select Finish)

4 String 2+2 Bass Ratio Y-Style Button (PRB-4220, Select Finish)

PRB-4220-C0

702725245178

Regular price $114.99 USD
Regular price Sale price $114.99 USD
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Select Finish
Select Button Style

RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low E to G - 36:1, 30:1, 20:1, 18:1.

We balanced the gear ratios to each string simplifying the tuning process.

With RATIO®, a half-turn is a semi-tone!

Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string. 

 

Bass Ratio animation

The PRB-4220 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use a 2 x 2 configuration.

 

In order to achieve higher gear ratios, Ratio are the world's first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.

 

Headstock Configuration 2 x 2  Ratio Tuned Machine Heads: The New Standard In Tuning Technology

Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 35/64" (14mm)
String post diameter: 0.547" (13.9mm)
String post length to string hole: 1.030” (26.1mm)
Weight per single machine head: 1.86oz (53g)
Weight per set of four: 7.44oz (212g)
String diameter up to 0.98 gauge (or larger if taper-wound)
Includes 4 machine heads, mounting screws, and bushings

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5.0
Rated 5.0 out of 5 stars
Based on 183 reviews
Total 5 star reviews: 175 Total 4 star reviews: 8 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend these products
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183 reviews
  • T
    Tom
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    Reviewing
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    5 Stars

    Love Graph Techs locking tuners. Second

    set I've put on a guitar.

  • BP
    Bill P.
    Verified Buyer
    6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)
    Reviewing
    6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    title

    Working very well!

  • RS
    Ray S.
    Verified Buyer
    6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)
    Reviewing
    6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    Killer Tuners!

    Literally installed in less than 5 minutes. Once the fresh set of strings were stretched out, the git stays in tune like nobody's business. I'm not a finesse type player. I beat the heck outta a guitar and made it wish it was never born. These tuners don't lose tune. Pretty amazing. Being locking tuners, string changes are killer fast as well. Highly recommend! 🤘 🤘

  • RB
    Randy B.
    Verified Buyer
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    Reviewing
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    Locking tuners FTW

    Super easy install, plates lined up perfectly, tuners work great! These will be my go-tos for all future tuner upgrades.

  • JM
    John M.
    Verified Buyer
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    Reviewing
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)

    Awesome locking tuners. Highest quality and precision.

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