4 String 2+2 F-style Bass Ratio - Chrome (PRB-4221-C0)
4 String 2+2 F-style Bass Ratio - Chrome (PRB-4221-C0)
PRB-4221-C0
702725244690
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RATIOĀ® patented gear technology
RATIOĀ® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
From Low E to G - 48:1, 36:1, 25:1, and 23:1.
We balanced the gear ratios to each string simplifying the tuning process.
With RATIOĀ®, a half-turn is a semi-tone!
Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.Ā
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The PRB-4221 is a right-handed set of RATIOĀ® Calibrated Machine Heads for BASS that use a 2 x 2 configuration.
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In order to achieve higher gear ratios,Ā Ratio are the world'sĀ first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.
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Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 0.720" (18mm)
String post diameter: 0.547" (13.9mm)
String post length to string hole: 0.807ā (20.5mm)
Weight per single machine head: 3.5oz (99.3g)
Weight per set of four: 14oz (397g)
String diameter up to 130 gauge
Includes 4 machine heads, mounting screws and bushings
Invisomatch Mounting Plates
InvisoMatch Mounting Plates for RATIO Tuned Machine Heads are the easiest approach to installing Ratio Tuned Machine Heads on your guitar.Ā
Simply select the installation plate design that matches the screw/pin hole location of your factory installed machine heads.
Youāll be up and running within minutes, perfectly installed and aligned. Stay classy you axe master.
For stunning accuracy and response... upgrade to Ratio Machine Heads with it's patented Multi-Geared Tuning Technology.
The new standard in tuning.Ā
NO DRILLING, PERFECT ALIGNMENT, FAST INSTALLATION
With InvisoMatch mounting plates you will reduce the time to install RATIO machine heads to well under 15 minutes.
The alignment of the machine heads is perfect, no holes to drill or fill, ideal for vintage instruments.Ā
Four sets of brushed aluminum InvisoMatch mounting plates come free with every set of Ratio Tuners.Ā
Premium finishes including chrome, nickel, black and gold are available for order.
āAfter reading some reviews and seeing the ads, I decided to try a set of Graph Techās ratio tuners on my American standard Strat. The tuners arrived and I was very pleased with the quality and finish. Installing the tuners was a breeze using the included InvisoMatch plates ā no need to drill any holes in my beloved Strat and the performance of these tuners is outstanding!"
"Tuning becomes incredibly easy and holds tune even when using the tremolo bar. I would highly recommend these as a great upgrade to any guitar and will be telling my customers what a great addition they would be for very stable and easy tuning.
Thanks, Graph Tech for a great product.!
Jay Langan / Magdon Music / guitar sales/ guitar techĀ
Click a picture to open a PDF file with the dimensions.
- VVVilliam V.Verified BuyerReviewing7 STRINGS: 7-in-line Electric Locking Machine Heads (PRL-8721-C7, Select Finish)I recommend this productRated 5 out of 5 stars1 week ago7-in-line ratio machine heads
Purchased to improve the tunability of a baritone guitar, especially the low strings. They solve the problem well, significantly improving the quality of the instrument.
- JPJohn P.Verified BuyerReviewing6-In-Line Ratio Electric Locking Machine Heads Staggered Posts (PRL-9721, Select Finish and Button Style)I recommend this productRated 5 out of 5 stars1 week agoAmazing as usual.
These are my second set of Ratios. Both are on guitars with old school non-fine tuner Floyd Rose bridges. They are high quality, have smooth action, and keeps things locked in tune. Plus they look great.
- SBstephen b.Verified BuyerReviewing3+3 Ratio Electric Guitar Machine Heads (PRN-2311, 2341, please select finish and button style)I recommend this productRated 5 out of 5 stars2 weeks agoSolid tuners
Feel great, solid, stay in tune. Replaced stock tuners on epiphone casino
- JCjesse c.Verified BuyerReviewing4 String 2+2 Bass Ratio Y-Style Button (PRB-4220, Select Finish)I recommend this productRated 5 out of 5 stars3 weeks agoSolid well thought out tuners
Great stability and tuning precision. Great upgrade for any bass or guitar
- GNGreg N.Verified BuyerReviewing3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)I recommend this productRated 5 out of 5 stars3 weeks agoGraphtech is the best
Not much else to say here. They are the best in what they do. Pretty simple,ā¦