For a complete list of models in the Radius series, see Portal:Radius series.

The Radius (R) series is a line of solid body electric guitars produced for Hoshino Gakki and sold under the Ibanez brand. The initial Radius models were introduced in 1987.

The first Radius model was the 540R and was originally part of the Ibanez Roadstar Pro series, together with the 540P Power and 540S Saber models also introduced in 1987. Therefore these models were known first as the PRO540R or 540R. The now common "series designation + model number" model name format was introduced in 1992 for the Radius series.

While the Radius series was discontinued after 1994 the Radius shape lived on in the Joe Satriani series which it inspired.

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