O-I

O-I is a tier 6 heavy tank from Japan in World of Tanks. This is a researchable tech-tree vehicle.

O-I stats at a glance

The O-I has 880 hit points , 150mm of frontal hull armor , and a top speed of 25 km/h. . The vehicle can equip 2 different gun configurations, allowing for varied playstyles.

Hull & survivability

The front-to-side armor ratio is 2.1:1. This pronounced angling makes the O-I significantly stronger when keeping its front facing the enemy.

Mobility

Forward-to-reverse speed ratio is 2.5:1. Reverse speed is limited, so pre-aim and exposure timing matter more on this vehicle.

Camouflage

Available guns (2)

How O-I compares to its peers

There are 23 tier 6 heavy tanks in WoT, including the O-I. Its 880 HP places it in the top 41% for hit points among same-tier heavy tanks (peer average: 855). Frontal hull armor of 150mm ranks in the top 23% for the class (peer average: 108mm). Top forward speed of 25 km/h is faster than 9% of peer vehicles in this tier and class.

Direct comparisons

• O-I vs A43 BP — tier 6 heavy tank from UK
• O-I vs ARL 44 — tier 6 heavy tank from France
• O-I vs CDT — tier 6 heavy tank from France
• O-I vs Chur Gloriana — tier 6 heavy tank from UK
• See full tier 6 heavy tank tier list — all 23 vehicles ranked

About this vehicle

Development of the superheavy tank was started after the Battles of Khalkhyn Gol in 1939. The vehicle was designed as a maneuverable fire unit that was unprecedented in scale—its hull alone weighed 100 tons. Only one prototype was built, without a turret and made of construction steel. Trials were discontinued due to the unreliable engine; at the end of 1944, the prototype was scrapped. The 15 cm howitzer was to be mounted on the tank after its assembly.

Frequently asked