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Ibanez built the GRGM21MJB as part of the miKro Series, a line of reduced-scale electric guitars positioned for players requiring a shorter scale length. The GRGM21MJB carried the Jewel Blue finish and sat at the entry level of the GRG family.
The guitar featured a basswood body paired with a maple neck and maple fretboard bearing black dot inlays. Twenty-four medium frets ran along a 400mm radius board, with a 22.2-inch scale length and a 41mm plastic nut. String spacing at the Ibanez F106 bridge measured 10.5mm. Passive ceramic Infinity R humbuckers occupied both the neck and bridge positions, and all hardware was finished in chrome. The neck profile was the GRGM taper, measuring 19.5mm at the first fret and 21.5mm at the twelfth, with a fretboard width of 56mm at the twenty-fourth fret. The guitar left the factory strung to standard E-to-E tuning with a .010–.046 gauge string set.
Owners sourcing replacement parts — including bridge saddles compatible with the F106, Infinity R pickup replacements, or a correctly sized plastic nut — should consult a qualified guitar technician to confirm fit against the instrument's actual dimensions.
Nothing in The Vault is for sale. These records exist so the instruments stay documented after the manufacturer moves on — and the most useful part of that record is what owners add to it.
The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
