Rock Hardi N°21
| Periodical Title | Rock Hardi |
| Editor | Fabrice Ribaire |
| Cover/Jacket Design by | Bruno Blum |
| Illustrator | Druilhe, Manu, Soutif, Bruno Blum, Hilare Moderne, Patrice Larme |
| Contributor | El Rotringo, Hilare Moderne |
| About/Subject | Rémi, Lolitas, In Vitro, Shaking Dolls, Dirty District, Les Tambours du Bronx, Witches Valley, Spiral Scratch, Thompson Rollets, Bruno Blum, Happy Drivers, Sttellla, The Pasadenas, Les Dirteez |
| Format | Zine |
| Language | French |
| Location | France |
| Cover Date | 1990-06 |
| Pages / Font | 56 pages |
| Issue Number | 21 |
| Price | F30.00 |
| Notes | + 45 T : Maniacs / Croaks |
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