| Displacement | 14,636t normal, 15,595t full load |
|---|---|
| Length | 147.8m wl, 137.2m oa |
| Width | 23.0m |
| Draught | 8.0m |
| Machinery | 2-shaft recipro, 22,500ihp (Ibuki 2-shaft turbine, 24,000shp) |
| Fuel | oil 200t (Ibuki 218t), coal 1868t (Ibuki 2000t) |
| Speed | 20.5kt (Ibuki 21.5kt) |
| Armour | belt 100-180mm, barbette 125-180mm, turret 125-180mm, CT 200mm, deck 75mm |
| Armament | 4-30.5cm/45cal. gun (2x2), 8-20.3cm/45cal. gun (1x4, 2x2), 14-12cm/40cal. gun, 4-8cm/40cal gun, 3-45cm TT (below wl) |
| Complement | 844 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ibuki | FY1904 | Kure NYd | 1907. 5.22 | 1907.11.21 | 1909.11. 1 | C1 | 1912. 8.28 BC 1923. 9.20 disc 1924 BU |
| Kurama | FY1904 | Yokosuka NYd | 1905. 8.23 | 1907.10.21 | 1911. 2.28 | C1 | 1912. 8.28 BC 1923. 9.20 disc 1924-1925 BU |