Another disadvantage of self-propelled guns is that they tend to be equipped with lighter, less accurate guns. Depending on the nature of the battle being fought, either or both of these drawbacks could prove a severe restriction. However, this is not necessarily true of modern self-propelled guns such as the German PzH 2000. This has a 155 mm main armament that can with assisted firing charges reach 60 km, has a maximum speed of 67 km/h (41 mph) on road surface and 45 km/h (28 mph) off-road, and has a fully computerised fire-control system that enables it to fire-move-fire before the enemy can pin it down for counter-battery fire. It has a rate of fire of 10 rounds per minute.