Audi TT Coupe [UK] (1999) Bolt Pattern & Wheel Fitment
Audi TT Coupe [UK] (1999): 5x100 bolt pattern, 57.1mm center bore. Factory wheels: 17x7.5J F/R. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 17x7.5J F/R |
| Flush Fitment | 18x8.5J at ET25 offset |
| Maximum Aggressive | 19x9.0J at ET20 offset |
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
Coupes and performance platforms are where rotational mass shows up fastest — in acceleration, in braking, and in how quickly the chassis changes direction. Forging lets us build to the same strength spec as the factory wheel at a meaningfully lower rotational weight, which is where the performance gain actually comes from, not just the visual one.
The Audi TT Coupe [UK] runs a 5x100 bolt pattern, 57.1mm center bore, and a 17x7.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 18x8.5J ET25, which tucks the tire under the fender lip on a stock-height Audi TT Coupe [UK]. Our Maximum Aggressive reference is 19x9.0J ET20 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Audi TT Coupe [UK] OE Wheel Specs
The 1999 Audi TT Coupe [UK] (Sports Car) uses a 5x100 bolt pattern with a 57.1mm center bore. Factory wheels are 17x7.5J 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 Audi TT Coupe [UK] (1999) we drill the 5x100 pattern and cut the centre bore to 57.1mm 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 — 6,436 vehicles, free to download, CC BY 4.0.
Flush Fitment
For a flush look with minimal rubbing, F/R 18x8.5J ET25 is the recommended starting point on a stock or mildly lowered Audi TT Coupe [UK].
Maximum Aggressive Fitment
F/R 19x9.0J ET20 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
A Factory-Style 17x7.5J ET32
Recommended setup: 17x7.5J ET32 | Economy impact: Negligible | Best for: Daily commuting, family use
Appearance: 7/10 | Comfort: 9.5/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $450-800 (wheels + tires + install)
B Comfortable Upgrade 18x8.0J ET29
Recommended setup: 18x8.0J ET29 | Economy impact: -2 to -4% | Best for: Daily / street
Appearance: 8/10 | Comfort: 9/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,950-2,550 (wheels + tires + install)
C Balanced / Flush Fit 18x8.5J ET25
Recommended setup: 18x8.5J ET25 | Economy impact: -4 to -6% | Best for: Street
Appearance: 8.5/10 | Comfort: 8/10 | Install difficulty: ★★☆☆☆
Estimated cost: $2,600-3,400 (wheels + tires + install)
D Aggressive 19x9.0J ET23
Recommended setup: 19x9.0J ET23 | Economy impact: -6 to -9% | Best for: Show / occasional track
Appearance: 9/10 | Comfort: 6.5/10 | Install difficulty: ★★★☆☆
Estimated cost: $3,900-5,000 (wheels + tires + install)
E Max Aggressive 19x9.0J ET20
Recommended setup: 19x9.0J ET20 | Economy impact: -8 to -12% | Best for: Show only
Appearance: 9.5/10 | Comfort: 4/10 | Install difficulty: ★★★★☆
Estimated cost: $4,800-6,200+ (wheels + tires + install)
Performance Comparison Matrix
| Metric | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | 17x7.5J ET32 | 18x8.0J ET29 | 18x8.5J ET25 | 19x9.0J ET23 | 19x9.0J ET20 |
| Economy Impact | Negligible | -2 to -4% | -4 to -6% | -6 to -9% | -8 to -12% |
| Appearance | 7/10 | 8/10 | 8.5/10 | 9/10 | 9.5/10 |
| Comfort | 9.5/10 | 9/10 | 8/10 | 6.5/10 | 4/10 |
| Install Difficulty | ★☆☆☆☆ | ★☆☆☆☆ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
| Cost Range | $450-800 | $1,950-2,550 | $2,600-3,400 | $3,900-5,000 | $4,800-6,200+ |
| Best For | Daily commuting, family use | Daily / street | Street | Show / occasional track | Show only |
Real-World Reference Cases
The examples below are compiled from typical ANKUSI customer configurations and are labeled as reference cases, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Everyday driving, prioritizes comfort and low running cost.
Setup: 17x7.5J ET32
Cost: ~$620
Outcome: Minimal visual change, ride and fuel economy essentially unaffected.
Case 2: Balanced Enthusiast (Balanced / Flush Fit)
Profile: Wants a sportier stance without sacrificing daily usability.
Setup: 18x8.5J ET25
Cost: ~$3,000
Outcome: Noticeable visual upgrade, fuel economy drop within the expected range.
Case 3: Show Build (Max Aggressive)
Profile: Built primarily for shows or occasional track/show use.
Setup: 19x9.0J ET20
Cost: ~$5,500
Outcome: Maximum visual impact; daily comfort and fuel economy are heavily compromised, physical test fit required before production.
Decision Guide
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: 17x7.5J ET32 → ~5.51″ backspacing
- Flush: 18x8.5J ET25 → ~5.73″ backspacing
- Max: 19x9.0J ET20 → ~5.79″ backspacing
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Audi spec, or want a wheel built to a custom offset for your Audi TT Coupe [UK]? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Custom Forged Wheels for the Audi TT Coupe [UK] (1999)
Everything above is reference data. If you want wheels actually built to it, that is what ANKUSI does: we are a forged wheel factory in Guangzhou, China, IATF 16949 and ISO 9001 certified, forging on our own 10,000-ton press and producing over 120,000 wheels a year. Forging blank, CNC machining, finishing, coating and inspection all happen in the same building — nothing is subcontracted and nothing is relabelled from another manufacturer.
Every set is cut to order, so the 5x100 pattern and the 57.1mm centre bore are machined for this car specifically rather than shimmed with adaptor rings. Diameter, width, offset, concavity, monoblock or multi-piece construction and the finish are all yours to choose — most Audi orders on this platform land somewhere between the 18x8.5J ET25 flush setup and the 19x9.0J ET20 aggressive setup referenced above.
Designs we already tool for the 5x100 pattern — each one is re-cut to your sizes and offsets:
Gloss Black 8-Spoke Forged Wheels – Honda Civic / Mazda MX-5 Fitment (5-Lug)
Gloss White Semi-Full-Face Forged Wheels – Toyota GR86 / Toyota Supra Fitment (5-Lug)
Matte Silver 6-Spoke Forged Wheels – Toyota GR86 / Toyota Supra Fitment (5-Lug)
Custom Finish Split Machined Face Forged Wheels – Toyota GR86 / Toyota Supra Fitment (5-Lug)Frequently Asked Questions
What bolt pattern (PCD) does the Audi TT Coupe [UK] use?
How many lug bolts does the Audi TT Coupe [UK] use?
What is the center bore size on the Audi TT Coupe [UK]?
What size are the factory (stock) wheels on the Audi TT Coupe [UK]?
What is the biggest wheel size I can fit on my Audi TT Coupe [UK] without rubbing?
What does a flush wheel fitment look like on the Audi TT Coupe [UK]?
Do I need wheel spacers for my Audi TT Coupe [UK]?
How do I calculate wheel backspacing for my Audi TT Coupe [UK]?
What's the difference between wheel offset and backspacing?
Can I run staggered wheels (different sizes front and rear) on my Audi TT Coupe [UK]?
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M14x1.5, ball-seat lug bolt (13mm radius).
Factory Torque Spec: 120 Nm (89 ft-lb). Shared VW/Audi Group ball-seat bolt spec used across most 5x112 Audi models.
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.