Bass Ratio 5 String - 2 + 3  Y-Style Button (Please Select Finish) - Graph Tech Guitar Labs Ltd.
Bass Ratio 5 String - 2 + 3  Y-Style Button (Please Select Finish) - Graph Tech Guitar Labs Ltd.

5 String 2+3 Bass Ratio Y-Style Button (PRB-5230, Select Finish)

Rated 5.0 stars
1 Review

Select Finish


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

From Low B to G - 48:1, 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-5230 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use 2 x 3 configuration.


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


2x3 tuners set  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 six: 9.3oz (265g)
String diameter up to 98 gauge
Includes 5 machine heads, mounting screws and bushings



Staggered Ratio Measurements.pdf Ratio Installation Guide.pdf Ratio Installation Guide Video



Our Bass Ratio rated 5 stars on Sweetwater.

Sweetwater Rating 5.0


Rated 5.0 stars
Based on 1 review
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
1 review
  • JA
    José A.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    6 days ago
    Amazing improvement

    My bass has become in a new one. The tuner isn`t mad anymore, not even when tuning the B-string. And the sound is now more defined, clear. My bass: Cort Artisan B5 (early 90`s).

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