罗恩级舰只的主舰炮为安装在两座双联装炮塔上的四门210毫米40倍径速射炮(英语:21 cm SK L/40)[註 1],分设于中央舰艛的两端。它们在发射108公斤(238英磅)炮弹的初速为780米每秒(2,600英尺每秒)。炮塔的初始最大高程为16度,射程为12,300米(13,500碼)。而当其后将高程提升至30度后,最大射程则达到16,200米(17,700碼)。[11]
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