Holden Gemini Generations Overview
TX–TC–TD Gemini (1975–1978)
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Tyre Sizes:
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155R13
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165/75R13
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Rim Sizes:
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13x4.5J
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13x5J
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PCD: 4x100
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Offset: ET35 to ET40
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Centre Bore: 56.6 mm
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Wheel Nut Torque: 75–85 Nm
TE–TF Gemini (1979–1983)
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Tyre Sizes:
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165/75R13
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175/70R13
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Rim Sizes:
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13x5J
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13x5.5J
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PCD: 4x100
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Offset: ET35 to ET40
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Centre Bore: 56.6 mm
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Wheel Nut Torque: 80–90 Nm
TG Gemini (1983–1985)
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Tyre Sizes:
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175/70R13
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Rim Sizes:
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13x5.5J
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PCD: 4x100
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Offset: ET35 to ET40
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Centre Bore: 56.6 mm
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Wheel Nut Torque: 85–90 Nm
Key Technical Summary
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PCD: 4x100
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Centre Bore (CB): 56.6 mm
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Offset Range: ET35 → ET40
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Wheel Nut Torque: 75 Nm → 90 Nm
Common Upgrade Tyre Sizes (Australia)
Popular classic and performance upgrades:
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185/60R14 (common street upgrade)
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195/50R15 (balanced performance setup)
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205/50R15 (wide stance, requires guard modification)
Always confirm rolling diameter and clearance when modifying classic vehicles.
Recommended Tyres for Holden Gemini
At Autosport Tyre World, we commonly recommend:
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Daily Driving / Classic Use
https://autostw.com.au/search?type=product&q=Continental+UC7 -
Balanced Performance
https://autostw.com.au/search?type=product&q=Michelin+Primacy+5 -
Enthusiast / Sport
https://autostw.com.au/search?type=product&q=Michelin+Pilot+Sport+5
Why Correct Fitment Matters
Correct tyre and wheel fitment ensures:
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Safe handling on lightweight classic chassis
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Proper hub fitment via correct centre bore
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Reduced vibration and improved ride quality
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Preservation of originality and vehicle value
Incorrect fitment can lead to rubbing, instability, and premature component wear.
Visit Autosport Tyre World
Professional fitting, balancing, and expert advice available at:
Magill
647 Magill Road, Magill SA 5072
0452 641 023
Wingfield
411 Grand Junction Road, Wingfield SA 5013
0433 645 411
Clarence Gardens
911 South Road, Clarence Gardens SA 5039
0420 299 911