| Displacement | 755t surface, 1050t submerged |
|---|---|
| Length | 70.1m oa |
| Width | 6.1m |
| Draught | 3.7m |
| Machinery | 2-shaft diesel/electric motor, 2600bhp surface, 1200shp submerged |
| Fuel | oil 75t |
| Speed | 17kt surface, 9kt submerged |
| Range | 6000nm/10kt surface, 85nm/4kt submerged |
| Armament | 6-45cm TT, 1-8cm/28cal AA gun |
| Complement | 45 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ro-13 (SS-23) | FY1917 | Kure NYd | 1918. 9.14 | 1919. 8.26 | 1920. 9.30 | SS2 (SS-23) | 1924.11. 1 renamed (Ro-13) 1932. 4. 1 disc |
| Ro-14 (SS-22) | FY1917 | Kure NYd | 1918. 9.14 | 1919. 3.31 | 1921. 2.17 | SS2 (SS-22) | 1924.11. 1 renamed (Ro-14) 1933. 9. 1 disc |
| Ro-15 (SS-24) | FY1917 | Kure NYd | 1920. 6.12 | 1920.10.14 | 1921. 6.30 | SS2 (SS-24) | 1924.11. 1 renamed (Ro-15) 1933. 9. 1 disc |