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T-55S1

Tanks · Slovenia · 1965
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T-55S1

* Absolute score — assessed within category · no era adjustment
Firepower
32
Protection
28
Mobility
42
Technology
20
Reliability
85
Crew Survivability
18
Operational Range
62
Logistics
95
Historical Performance
75
Strategic Impact
88
Origin Slovenia
CategoryTanks
EraCold War
In service1965–1975
Operators21 countries
Quantity2,500
Data Quality87%
MASS(Military Archive Scoring System)
45
Tanks MASS Rating
68/89
Cold War
230/563
All-Time
Tanks · 10 axes scored
Firepower
32
Protection
28
Mobility
42
Technology
20
Reliability
85
Crew Survivability
18
Operational Range
62
Logistics
95
Historical Performance
75
Strategic Impact
88
ⓘ Regardless of era, the same scoring system applies to all units in the tanks category.
01 / Overview
T-55S1
Category
Country
Production
1965–1975
Quantity
2,500
Unit Price (current)
$2.4M↗ 1084% inflation · 1956→2025
Original Price
$200.0K (1956)
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
TANKS · COLD WAR
68
PERFORMANCE/PRICE
78
UNIT COST (2025 USD)
$2.4M
Original: $200.0K (1956)
Inflation: +%1084
45
tanks category
ⓘ Performance/Price and MASS score are computed across all units in the tanks category, regardless of era.
02 / Specs & Design
◎General5MOD.5
  • Tank ClassificationMedium Tank
  • GenerationCold War
  • Combat Weight36 t
  • Crew Size4
  • Service Entry Year1961
◈Firepower9MOD.9
  • Main Gun Calibre100 mm
  • Main Gun TypeRifled
  • Main Gun Length (Calibres)53
  • Muzzle Velocity (Max)880 m/s
  • Effective Range (Main Gun)2,000 m
  • Ammunition Stowage43
  • Can Fire APFSDSYes
  • Can Fire ATGMNo
  • Coaxial / Secondary MG Count1
▣Protection7MOD.7
◇Mobility8MOD.8
  • Engine Power581 hp
  • Power-to-Weight Ratio16.1 hp/t
  • Fuel TypeDiesel
  • Transmission TypeManual
  • Suspension TypeTorsion Bar
  • Max Road Speed51 km/h
  • Max Off-Road Speed35 km/h
  • Operational Range (Road)325 km
◆Dimensions5MOD.5
  • Length (Hull)6 m
  • Length (Overall, Gun Forward)9 m
  • Width3.15 m
  • Height2.4 m
  • Ground Clearance0.425 m
⬢Amphibious & Special3MOD.3
▲Production & Service2MOD.2
  • Years in Production18 year
  • Notable Variants Count12
03 / History
SERVICE LIFESPANStill in Service
  1. 1965Production started
  2. 1975Production ended
61
years in service
10
years in production
2,500
units produced
3
countries operating
ⓘ 18 countries retired it.
04 / Operators
Operator Inventory2country · 11units
11active
T-55S1SALES1records
YearBuyerQuantityAmountPresent Value (2025)
—Egypt———
ⓘ "Present Value" is an estimated amount adjusted for inflation.
📖 TERMS ON THIS PAGE11terms
Armour-piercing fin-stabilized discarding sabot: a type of kinetic energy penetrator ammunition.
Type of internal combustion engine fuel, refined from crude oil.
Manual: a tank transmission in which the driver selects gear changes manually, typically using a clutch pedal and gear lever to engage gears.
A fire control system relying on optical sights and manual input for aiming and range estimation without computer assistance.
A tank with medium weight and armor, balancing mobility and firepower.
Nuclear, Biological, Chemical protection for tank crews.
Enhanced low-light visibility through specialized optics or sensors.
A rifled gun has spiral grooves cut into its barrel.
Handheld or vehicle-mounted devices that release dense smoke to obscure vision, conceal movements, or screen friendly forces from enemy observation.
A torsion bar is a steel rod that resists twisting and serves as a spring in tank suspensions, with one end fixed to the hull and the other connected to a lever arm moving the road wheel.
Armour made by welding and rolling homogeneous steel plates.
These terms are listed automatically because they appear on this page.full encyclopedia →
📚 Sources
📖 ENCYCLOPEDIA Browse the Tanks entry →