Innovative tuning machines that assign a unique gear ratio to each string for uniform tuning response.
2 guitars checked: 2 needs verification.
Where to buy
We haven't added a verified place to buy this one yet.
Tuner hole size
10mm
ConfirmedMounting pattern
Two-pin casing, usable as-is or with Graph Tech's optional InvisoMatch mounting plates. Staggered posts, dedicated left-handed set (PRL-9721-L/9731-L), for mirrored left-handed 6-in-line headstocks that do not tilt back. Confirmed via Graph Tech's own product listings.
ConfirmedGear ratio
Not a single ratio by design, RATIO tuners assign a unique gear ratio to each string position so one turn produces the same pitch change on every string, confirmed via Graph Tech's own manufacturer spec sheet
Confirmed2 guitars checked: 2 needs verification.
We could not confirm a left-handed version of this tuner set exists. Check with the maker before buying.
No left-handed version of the Graph Tech Ratio set was confirmed in this pass, unlike Fender's own locking tuners and Sperzel's Trim-Lok, which both have real left-handed availability confirmed for this guitar.
Help confirm this fit
We could not confirm a left-handed version of this tuner set exists. Check with the maker before buying.
No left-handed version of the Graph Tech Ratio set was confirmed in this pass, unlike Fender's own locking tuners and Sperzel's Trim-Lok, which both have real left-handed options. This is left as unresolved rather than assumed unavailable, since Graph Tech's full catalog was not exhaustively checked.
Help confirm this fit
If you have fitted any of these to this Graph Tech Ratio Machine Heads (6-in-line, Staggered, Left-Handed), tell us what you found and we'll update the data.
