The IS-1 (IS-85) heavy tank was a thorough modernization of the KV-1. The tank featured the 85-mm D-5T gun. The IS-1 entered mass production in October 1943, but work was discontinued at the beginning of 1944, as the IS-2 (IS-122) tank entered mass production in December 1943. A total of 107 vehicles were manufactured.
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85 mm D5T-85BM (damage per shot: 180):
100 mm D10T (damage per shot: 250):
122 mm D-2-5T (damage per shot: 390):
122 mm D-25T (damage per shot: 390):
85 mm D-5T (damage per shot: 160):
85 mm D5T-85BM (damage per shot: 180):
100 mm D10T (damage per shot: 250):
122 mm D-2-5T (damage per shot: 390):
122 mm D-25T (damage per shot: 390):
85 mm D-5T (damage per shot: 160):
Expected
frags:
0.99
Expected
spot
1.03
Expected
defense points
0.84
Expected
winrate
53.52%
Tier VII field modification
available for tier IX-X tanks
Tier VIII field modification
available for tier X tanks
+3% to vehicle hit points
+10% to suspension durability
+5% to hull traverse speed
-7% to maintaining speed when crossing all terrain types
-3% to the aiming circle size
-5% to aiming speed
+3% to view range
+15% to additional stun duration
+10% to stun duration