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2005 Ford GTX1 Roadster Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Ford GTX1 Roadster wheels? This page gives the 2005 Ford GTX1 Roadster bolt pattern (5x114.3), centre bore, factory rim size and the offset range for aftermarket and forged Ford GTX1 Roadster rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2005 Ford GTX1 Roadster uses a 5x114.3 bolt pattern with a 70.5 mm centre bore and M12x1.5 lug nuts. For aftermarket wheels, 19x9.5J ET35 front / 20x12J ET42 rear sits flush.
Forged wheels for the 2005 Ford GTX1 Roadster — drilled 5x114.3 with a 70.5 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Ford GTX1 Roadster (2005): 5x114.3 bolt pattern, 70.5mm center bore, OE F 18x9J ET50 / R 19x11.5J ET50. Forged wheel fitment specs from ANKUSI.
Bolt Pattern5x114.3
Wheel Bolt/NutM12x1.5 Nut
Center Bore70.5mm
Wheel Load Rating700–850 kg/wheel (Performance / Sports Car segment reference)
Year2005
Category5-Lug Performance / Tuner
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 18, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Flush Fitment | F 19x9.5J ET35 / R 20x12J ET42 |
Forged Wheel Designs for the Ford GTX1 Roadster
Every design below is forged to order, so it can be machined to the Ford GTX1 Roadster's 5x114.3 bolt pattern and 70.5 mm center bore, with the width and offset calculated for your setup.
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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
Convertibles lose some of the structural rigidity a fixed roof provides, which means the suspension and wheels end up doing more of the work to keep the chassis composed. A forged wheel keeps unsprung mass down without sacrificing the strength margin the factory built in — useful on a platform that's already managing extra flex.
The Ford GTX1 Roadster ships from the factory on a 5x114.3 bolt pattern with a 70.5mm center bore and a F 18x9J ET50 / R 19x11.5J ET50 wheel. Our flush reference for the Ford GTX1 Roadster is F 19x9.5J ET35 / R 20x12J ET42.; our maximum aggressive reference is F 19x10J ET30 / R 20x12.5J ET38. — beyond that, expect clearance issues against the fender liner without further modification.
Ford GTX1 Roadster OE Wheel Specs
The Ford GTX1 Roadster ships from the factory on 5x114.3 bolt pattern wheels with a 70.5mm center bore. The stock wheel size is F 18x9J ET50 / R 19x11.5J ET50, offering a balanced ride that suits most owners without any rubbing or clearance concerns.
Why the factory spec works for most owners:
- Balances ride comfort with steering response and highway efficiency.
- Wide tire and wheel availability at the factory diameter keeps replacement costs low.
- Lower unsprung weight than larger aftermarket wheels helps ride quality and acceleration.
- Guaranteed clearance against brake calipers and suspension components.
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Ford GTX1 Roadster (2005) we drill the 5x114.3 pattern and cut the centre bore to 70.5mm 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.
Offset and Backspacing: Factory Wheel vs Options
Backspacing ≈ width/2 + ET/25.4 + 0.5 in. "Inward" means closer to the suspension; "outward" means closer to the fender lip.
| Setup | Size | ET | Backspacing | Inward vs OE | Outward vs OE |
|---|---|---|---|---|---|
| Factory (OE) | 18x9J | ET50 | 6.97 in (177 mm) | — | — |
| Flush | 19x9.5J | ET35 | 6.63 in (168 mm) | −9 mm | +21 mm |
| Maximum | 19x10J | ET30 | 6.68 in (170 mm) | −7 mm | +33 mm |
Vehicles With the Same Hub as the Ford GTX1 Roadster (5x114.3, 70.5 mm Bore)
In our database, 155 other vehicle entries from 6 makes use exactly the same 5x114.3 bolt pattern and 70.5 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
5x114.3 is used by 20.0% of the vehicle pages in our English fitment guide (1,300 of 6,503); 12.0% of those also use a 70.5 mm center bore.
Hub-Centric Rings for a 70.5 mm Center Bore
A wheel with a center bore larger than 70.5 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 71.6 mm | 71.6 → 70.5 mm |
| 72.6 mm | 72.6 → 70.5 mm |
| 73.1 mm | 73.1 → 70.5 mm |
| 74.1 mm | 74.1 → 70.5 mm |
ANKUSI forged wheels are bored to exactly 70.5 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Ford GTX1 Roadster use?
The 2005 Ford GTX1 Roadster uses a 5x114.3 bolt pattern.
How many lug bolts does the Ford GTX1 Roadster use?
The Ford GTX1 Roadster uses a 5-lug bolt pattern (5x114.3), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Ford GTX1 Roadster?
The Ford GTX1 Roadster's center bore is 70.5mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What does a flush wheel fitment look like on the Ford GTX1 Roadster?
For a flush look with minimal to no rubbing, we recommend F 19x9.5J ET35 / R 20x12J ET42 as a starting point on a stock or mildly lowered Ford GTX1 Roadster.
Do I need wheel spacers for my Ford GTX1 Roadster?
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.
How do I calculate wheel backspacing for my Ford GTX1 Roadster?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 6.63" backspacing up front and 8.15" in the rear.
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 Ford GTX1 Roadster?
Yes — the Ford GTX1 Roadster's factory and our recommended flush/max fitments already use staggered sizing (different width front and rear), and ANKUSI can forge matching staggered sets to your target offsets.
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M12x1.5, conical-seat lug nut.
Factory Torque Spec: 136 Nm (100 ft-lb). Covers most Ford passenger cars and crossovers (Fusion, Focus, Escape and similar) on M12x1.5 studs.
TPMS: Vehicles built before the 2008 model year were not federally required to carry factory TPMS in the US, though many manufacturers adopted it earlier; verify whether your specific build has TPMS before ordering sensor-compatible wheels.
Tire Pressure: Always set tire pressure to the value on your vehicle's tire placard (driver's doorjamb or glovebox), not the max PSI printed on the tire sidewall — this is trim- and tire-size-specific and stays the same reference point when you switch to a different wheel and tire combination.
Reference data compiled from published OEM service specifications and cross-checked against independent repair sources; always confirm against your owner's manual or door-jamb placard before installation.
Sources and Last Update
Data checked against: avtoreference.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 18x9 wheels · 18 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.