Gloss Black 5 Y-Spoke Forged Wheels
Monoblock · Gloss Black
1957 Porsche 356 A 1600 S Speedster Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Porsche 356 A 1600 S Speedster wheels? This page gives the 1957 Porsche 356 A 1600 S Speedster bolt pattern, centre bore, factory rim size and the offset range for aftermarket and forged Porsche 356 A 1600 S Speedster rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Porsche 356 A 1600 S Speedster (1957): 5x205 ("Wide-Five") bolt pattern. Factory wheels: 15x4.5J F/R. Flush and max fitment confirmed on request.
Bolt Pattern5x205 ("Wide-Five")
Wheel Bolt/NutM12x1.5 Nut (vintage VW-derived stud)
Center BoreLug-centric (Wide-Five hub, no conventional bore spec)
Wheel Load Rating450–550 kg/wheel (Classic Sports Car segment reference)
Caliper TypeSolid disc brakes, all four corners (OEM, Porsche)
Year1957
CategoryClassic Sports Car
Data check: the bolt pattern and center bore on this page have not yet been confirmed by a second independent source. Measure your hub or ask us before ordering. How we verify
Forged Wheel Designs for the Porsche 356 A 1600 S Speedster
Every design below is forged to order, so it can be machined to the Porsche 356 A 1600 S Speedster's bolt pattern, with the width and offset calculated for your setup.
APEX-Style Mirror Polished 5 Y-Spoke Forged Wheels
Monoblock · Mirror Polished
BBS Bronze / Gold 5 Y-Spoke Forged Wheels
Replica · Bronze Gold
Porsche OEM-Style Blue 5-Spoke Forged Wheels
Monoblock · Blue
Black / Machined 5 Y-Twin-Spoke Forged Wheels
Monoblock · Gloss Black / Machined
HRE-Style Polished Twin 5-Spoke Blade Forged Wheels
Monoblock · Polished
Matte Silver 2-Piece 10-Spoke Side-Milled Forged Wheels
2-Piece · Matte Silver
How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
Classic Porsches use hub and bolt hardware that predates everything in a modern fitment table, so the honest approach is period-correct sizing rather than modern flush figures. Getting the diameter, width and hub type right matters far more here than squeezing out the last millimetre of offset.
We publish the factory specification for the Porsche 356 A 1600 S Speedster below. We have not yet been able to verify aftermarket flush or maximum-aggressive offsets for this exact variant against a source we trust, so we are not listing any - an invented offset is worse than no offset when a wheel has to clear a caliper.
Porsche 356 A 1600 S Speedster OE Wheel Specs
The 1957 Porsche 356 A 1600 S Speedster (Classic Sports Car) runs a 5x205 ("Wide-Five") hub with a Lug-centric (Wide-Five hub, no conventional bore spec)mm register. Factory wheels are 15x4.5J F/R.
Why the factory spec works for most owners:
- Keeps unsprung weight low to preserve the factory handling balance
- Matches the wider, performance-oriented tire sizing typical of this platform
- Maintains clearance for the factory brake package and suspension geometry
- Balances grip with ride comfort for daily and spirited driving
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Porsche 356 A 1600 S Speedster (1957) we machine every wheel to the vehicle’s own hub dimensions on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Aftermarket Fitment: Confirmed on Request
Porsche has not published a conventional offset figure for this variant (or it runs a bespoke / centre-lock hub), so a flush and maximum-aggressive range cannot be stated responsibly yet. Our engineering team is still collecting verified data for this variant. In the meantime the factory specification above is accurate and is the safe reference point for ordering.
What we do know: 356A outlaws run PMB Performance 5.5x16 wide-5 or Maxilite alloys with 165/185 tyres, some period Rudge centre-lock conversions 5x205 wide-5 drum platform; not compatible with modern 5x130 forged wheels without hub conversion
Need a wheel for this car now? Contact ANKUSI with your target diameter, width and offset and our engineers will confirm the correct forged spec against your brake package before anything is cut. You can also use our Offset & Backspacing Calculator to work through the numbers yourself.
Frequently Asked Questions
Do I need wheel spacers for my Porsche 356 A 1600 S Speedster?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Porsche 356 A 1600 S Speedster?
The Porsche 356 A 1600 S Speedster runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.