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At A Glance
- Neck Type
- GRGM / Maple neck
- Top/Back/Body
- Basswood body
- Fretboard
- Maple fretboard / Black dot inlay
- Fret
- Medium frets
- Number of Frets
- 24
- Bridge
- Ibanez F106 bridge
- String Space
- 10.5mm
- Neck Pickup
- Infinity R (H) neck pickup (Passive/Ceramic)
- Bridge Pickup
- Infinity R (H) bridge pickup (Passive/Ceramic)
- Factory Tuning
- 1E,2B,3G,4D,5A,6E
- Strings
- -
- String Gauge
- .010/.013/.017/.026/.036/.046
- Nut
- Plastic
- Hardware Color
- Chrome
- Scale
- 22.2
- A : Width
- 41mm at NUT
- B : Width
- 56mm at 24F
- C : Thickness
- 19.5mm at 1F
- D : Thickness
- 21.5mm at 12F
- Radius
- 400mmR
- Color
- Metallic Purple
- Series
- miKro
Ibanez produced the GRGM21MMPL as part of the miKro Series, a line of short-scale electric guitars built around a reduced scale length. The model sat at the accessible end of the GRG family, designed for players requiring a more compact instrument without departing from a conventional electric guitar layout.
The GRGM21MMPL was constructed with a basswood body and a maple neck carrying a maple fretboard with black dot inlays. Twenty-four medium frets ran the 22.2-inch scale, with a nut width of 41mm and a fretboard radius of 400mmR. The neck measured 19.5mm thick at the first fret and 21.5mm at the twelfth. Passive ceramic Infinity R humbuckers occupied both the neck and bridge positions. Hardware throughout was finished in chrome, including the Ibanez F106 bridge, which was set to a string spacing of 10.5mm. The factory string gauge ran .010/.013/.017/.026/.036/.046 at standard tuning, and the nut was plastic.
Owners sourcing replacement parts — including bridge saddles compatible with the F106, Infinity R pickup replacements, or a substitute plastic nut sized to the 41mm width — should consult a qualified guitar technician to confirm fit against the instrument's actual dimensions before installation.
STRAIGHT TALK
What Stands Out
Keep In Mind
From the people who own them
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.
Owner photos
Put yours on the record.
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.
What do you know about this one?
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.
Build Your Complete System
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Gear Help, Handled
From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
Fit & Compatibility
- Bridge, tuner, and nut fit confirmed for your guitar
- Pickup and electronics compatibility checks
- Pedal power and amp/cab impedance matching
Mods & Upgrades
- Upgrade paths for the guitars you already own
- Wiring, routing, and hardware swap guidance
- Advice from people who actually do the mods
The Vault
- Discontinued and EOL guitars kept on record
- Specs, history, and known part compatibility
- Share your builds and mods with the community
