What Is the Bolt Pattern on a 2001 Audi TT?

The standard bolt pattern on a 2001 Audi TT is 5×100, meaning five wheel bolts arranged on a 100 mm diameter circle. This specification applies to most first-generation (8N) Audi TT models sold in North America and many other markets; however, owners should still verify fitment because wheel size, offset, and center bore also affect compatibility.

Understanding the 2001 Audi TT Wheel Bolt Pattern

The 2001 Audi TT sits in the first generation of the model (chassis code 8N), and most factory configurations use a 5×100 bolt pattern. In practical terms, this defines which wheels will physically bolt onto the car. While aftermarket and OEM wheel choices abound, the 5×100 pattern is the key baseline measurement that dictates what fits without adapters.

Core Specifications for the 2001 Audi TT (8N)

When shopping for wheels or confirming fitment, it helps to know more than just the bolt pattern. The 2001 Audi TT’s wheel system has several critical dimensions that must work together for safe and correct installation.

• Bolt pattern: 5×100 (5-lug, 100 mm pitch circle diameter)
• Center bore (hub bore): 57.1 mm
• Thread size: M14 x 1.5 wheel bolts
• Typical OEM wheel diameters: 16"–18" (depending on trim and package)
• Typical OEM wheel widths: around 6.5"–7.5"
• Typical OEM offset (ET): roughly ET30–ET35 (varies by specific wheel)

Together, these figures describe the fundamental fitting envelope for the car: the 5×100 pattern ensures the wheel can bolt on, while the center bore, offset, and thread size ensure it centers correctly and clears suspension and bodywork.

What 5×100 Actually Means

Many drivers know the number but not the geometry behind it. The bolt pattern is defined by two values: how many fasteners hold the wheel, and the diameter of the circle on which those fasteners sit. For the 2001 Audi TT, both elements are critical when comparing wheels across brands or from other vehicles.

Breaking Down the Measurement

The 5×100 code describes both the count of bolts and the spacing between them. Understanding this can help avoid common mistakes, such as confusing similar patterns from other automakers.

• “5” (lug count): The wheel is secured by five bolts.
• “100” (PCD in mm): The bolt holes lie on an imaginary circle with a 100 mm diameter, known as the Pitch Circle Diameter (PCD).
• Metric standard: Audi and most European manufacturers use metric units, so PCD is always given in millimeters.
• Not interchangeable with 5×112: Many later VAG (Volkswagen–Audi Group) cars use 5×112; these wheels do not fit a 5×100 TT without special adapters.

Knowing that the PCD is 100 mm prevents mixing incompatible parts and highlights why wheels from later Audis or Volkswagens with a 5×112 pattern generally will not bolt on to a 2001 TT directly.

Other Fitment Factors Beyond Bolt Pattern

While the bolt pattern is the most frequently cited value, several additional parameters are essential for a safe and vibration-free wheel fit. Owners considering aftermarket wheels or cross-platform swaps should pay close attention to these details alongside the 5×100 specification.

Center Bore (Hub Bore)

The center bore dictates how the wheel sits on the hub, which strongly influences ride smoothness and safety.

• Center bore size: Approximately 57.1 mm on a 2001 TT.
• Hub-centric design: Audi uses hub-centric wheels, meaning the wheel centers on the hub rather than on the bolts alone.
• Larger bore wheels: Can typically be used with plastic or aluminum hubcentric rings to step down to 57.1 mm.
• Smaller bore wheels: Generally cannot be machined safely enough to fit; they are usually incompatible.

Ensuring a correct or properly adapted center bore helps avoid steering wheel vibration and uneven tire wear caused by off-center wheel mounting.

Wheel Bolts, Not Studs

Unlike many American and Japanese cars that use studs and lug nuts, Audi typically uses bolts that thread directly into the hub. This affects both installation technique and hardware selection.

• Hardware type: Wheel bolts, not lug nuts.
• Thread specification: M14 x 1.5 (14 mm diameter, 1.5 mm pitch).
• Seat type: Audi OEM wheels commonly use a ball-seat (radius) design; many aftermarket wheels use a cone-seat design.
• Important note: Using the wrong seat type (ball vs. cone) can cause loosening or damage, even if the bolt pattern is correct.

Selecting the correct bolt thread, length, and seat type is just as important as matching the bolt pattern, especially with aftermarket or spacer-equipped setups.

Offset (ET) and Width

Offset and wheel width determine how the wheel sits within the fender and how close it comes to brakes and suspension components.

• Offset (ET): Factory wheels are typically in the ET30–ET35 range.
• Higher ET (e.g., ET45): Moves the wheel further inside the wheel well, closer to suspension hardware.
• Lower ET (e.g., ET25): Pushes the wheel outward, which can create a more aggressive stance but risks fender rubbing.
• Width changes: Wider wheels increase the chance of interference and require more careful offset selection.

Even when a wheel has the correct 5×100 pattern, an inappropriate offset or width can cause handling issues, rubbing, or clearance problems with brakes and suspension.

Model Variations and Caveats

The 2001 Audi TT was offered in several versions, including front-wheel drive and quattro all-wheel drive, with different engines and factory wheel options. The bolt pattern, however, remained consistently 5×100 across mainstream configurations for that model year.

TT 180 vs. TT 225 and Regional Differences

Buyers often wonder whether engine or trim differences alter the bolt pattern or major fitment specs. For this model year, the underlying wheel-mounting geometry remains the same regardless of power output.

• TT 180 (FWD, 1.8T 180 hp): Uses 5×100 PCD, 57.1 mm center bore.
• TT 225 (quattro, 1.8T 225 hp): Also uses 5×100 PCD, 57.1 mm center bore.
• Roadster vs. Coupe: No change to bolt pattern; differences are in suspension tuning and trim.
• Regional markets: North America and European-spec 2001 TTs share the 5×100 pattern on standard models.

While wheel designs and sizes differ between trims and markets, the shared bolt pattern and hub bore mean most OEM and many aftermarket 5×100 wheels designed for the 8N TT are interchangeable, subject to offset and brake-clearance checks.

How to Double-Check Your Specific Car

Given the age of the 2001 Audi TT, many examples now on the road have aftermarket wheels, spacers, or even hub conversions. Verifying your car’s individual setup is prudent before ordering wheels or hardware.

Practical Verification Steps

Owners can confirm fitment details using documentation, on-car measurements, and visible markings. This is especially important if the vehicle’s history is unknown or heavily modified.

• Check the owner’s manual: It typically lists wheel sizes and basic fitment guidelines.
• Inspect existing wheels: Many OEM and aftermarket wheels have PCD, size, and offset cast into the back of the spokes or inside the barrel.
• Measure PCD if uncertain: A wheel shop can quickly confirm 5×100 versus similar patterns.
• Look for adapters/spacers: If present, they may convert to another pattern (e.g., 5×112); do not assume stock specs.

By verifying what is currently on the car, you reduce the risk of ordering incompatible wheels or hardware based on assumptions about factory configuration.

Summary

The 2001 Audi TT (first-generation 8N) uses a 5×100 bolt pattern across its mainstream trims, paired with a 57.1 mm center bore and M14 x 1.5 wheel bolts. While this 5×100 specification is the primary key to wheel compatibility, safe and proper fitment also depends on offset, width, seat type, and center-bore matching or adaptation. Given the age of these cars and the likelihood of modifications, confirming existing hardware and any spacers or adapters before purchasing new wheels is strongly recommended.

What lug pattern is a 2000 Audi TT?

Finance your Audi Wheels

YEAR	MAKE	COMMENTS
2000	Audi	5 lug 4.41 inch or 112mm High Positive Offset
2001	Audi	5 lug 4.41 inch or 112mm High Positive Offset
2002	Audi	5 lug 4.41 inch or 112mm High Positive Offset
2003	Audi	5 lug 4.41 inch or 112mm High Positive Offset

What is the 5X120 bolt pattern equal to?

A 5×120 bolt pattern is the metric equivalent of a 5×4.72-inch bolt pattern. While very similar, it is slightly different from the 5×120.7mm (5×4.75-inch) pattern, which is common on some vehicles like older Corvettes and Camaros. The difference is small (only 0.7 mm0.7 mm0.7 mm), but can cause issues if not addressed with proper adapters or hub-centric rings. 
Key takeaways

• 5×120 mm is the same as 5×4.72 inches. This is a common bolt pattern for many modern vehicles. 
• It is not the same as 5×4.75 inches, though the two are often confused. The difference is about 0.7 mm0.7 mm0.7 mm (0.028 inches). 
• For a perfect fit, always match the exact bolt pattern. Trying to fit a 5×4.75 wheel onto a 5×120 hub (or vice-versa) can cause pressure on the studs and lead to damage or safety issues. 
• Use proper adapters if needed. If your vehicle has a 5×4.75 bolt pattern and you want to use 5×120 wheels, you can use a wheel adapter. These adapters can help ensure a proper fit and reduce the risk of damage to your vehicle. 
• Always check compatibility before buying. Before purchasing wheels for your vehicle, check its specific bolt pattern and compare it to the wheel’s specifications. You can also check the manufacturer’s website or consult a professional if you are unsure. 

What is the bolt pattern on a 2001 Audi TT Quatro?

The 2001 Audi TT Quattro has a 5×100 bolt pattern, a center bore of 57.1mm, and uses M14x1.5 lug bolts. This means the wheels have five bolt holes arranged in a circle with a diameter of 100mm.
 
This video explains the basics of wheel specifications for the Audi TT: 1mThe Parrott Bro’sYouTube · Nov 8, 2020

• Bolt Pattern: 5×1005 cross 1005×100
• Center Bore: $57.1$mm
• Lug Bolt Thread Size: M14×1.5cap M 14 cross 1.5𝑀14×1.5
• Note: This is different from newer Audi models that use a 5×1125 cross 1125×112 bolt pattern. 

What is the bolt pattern on a TT?

The Audi TT bolt pattern varies by generation: models from 1998 to 2006 use a 5×100 pattern, while all subsequent models from 2006 to 2023 use a 5×112 pattern. All models share a 57.1mm hub bore and use a five-lug wheel.
 
You can watch this video to learn how to determine your car’s bolt pattern: 1mThe Parrott Bro’sYouTube · Nov 8, 2020

• For 1998–2006 (8N generation): The bolt pattern is 5×100. 
• For 2006–2023 (8J, 8S generations): The bolt pattern is 5×112. 
• For all generations: The hub bore is 57.1mm. 

This video explains what wheels will fit your VW/Audi: 59sDeutsche Auto PartsYouTube · Jan 30, 2020