Audi Tire Size Chart by Model: Recommended Standard & Winter Dimensions – Get the Right Rubber for Every Season
You’re staring at a wall of tires, your head spinning with numbers like 225/40R18 and 255/35R19, wondering which ones actually belong on your Audi—and what happens if you get it wrong. Choosing the right tire size isn’t just about filling the wheel wells; it’s about preserving your Quattro system, maintaining speedometer accuracy, and ensuring your Audi handles the way it was engineered to handle.
TLDR: Audi specifies exact tire sizes for every model, with different recommendations for standard all-season tires, performance summer tires, and dedicated winter tires. This guide provides a comprehensive tire size chart for current and recent Audi models, plus critical fitment rules for Quattro compatibility, speed ratings, and load indexes.
Your Audi’s tires are the only contact between its engineering excellence and the road. The right tire size ensures your Quattro system functions correctly, your speedometer reads accurately, and your vehicle maintains optimal handling and braking performance. The wrong size can cause transmission binding, ABS malfunctions, and dangerous handling characteristics.
Here’s a rule that should be tattooed on every Audi owner’s brain: On Quattro vehicles, all four tires must have the same rolling diameter within 1%. Even a small difference can cause drivetrain binding, premature differential wear, and costly repairs. This rule is non-negotiable.
Key Takeaways
- Know the numbers: Tire size format is Width/Aspect Ratio R Diameter (e.g., 225/40R18)
- Respect Quattro: All four tires must match exactly on Quattro models—same size, same brand, same tread pattern, and similar wear
- Winter vs. summer: Dedicated winter tires use the same size but may use narrower dimensions for better snow performance
- Speed rating matters: Your Audi’s top speed determines the minimum speed rating required
- Load index counts: Heavier Audis (Q7, e-tron) need higher load-rated tires
- Check your door jamb: The definitive tire size for your specific vehicle is printed on the driver’s side door jamb
How to Read Tire Sizes
Ever wonder what all those numbers and letters on your tire sidewall actually mean?
Example: 225/40R18 92Y
| Component | Meaning | Example |
|---|---|---|
| 225 | Tire width in millimeters | 225mm (8.86 inches) |
| 40 | Aspect ratio (sidewall height as % of width) | 40% of 225mm = 90mm sidewall |
| R | Radial construction | R = Radial |
| 18 | Wheel diameter in inches | 18 inches |
| 92 | Load index | 92 = 630 kg capacity per tire |
| Y | Speed rating | Y = 186 mph (300 km/h) |
The aspect ratio and width together determine the tire’s overall diameter—critical for speedometer accuracy and Quattro compatibility.
Speed Ratings
| Rating | Max Speed | Typical Use |
|---|---|---|
| V | 149 mph | Most standard Audis |
| W | 168 mph | High-performance Audis (S models) |
| Y | 186 mph | Ultra-high performance (RS models) |
| ZR | 149+ mph | Performance tires (older rating system) |
Using a tire with a lower speed rating than your Audi’s top speed is dangerous and illegal in some regions.
Load Index
| Index | Capacity (kg) | Typical Application |
|---|---|---|
| 91 | 615 | A3, A4, smaller models |
| 92 | 630 | A4, A5, standard models |
| 94 | 670 | A6, Q5, larger sedans |
| 97 | 730 | Q7, Q8, heavy SUVs |
| 100 | 800 | Q8 e-tron, heavy electric models |
Towing and heavy loads require higher load indexes.
Audi Tire Size Chart by Model
A3 / S3 / RS3 (8V/8Y – 2013–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| A3 (FWD) | 225/45R17 | 225/40R18 | 205/55R16 | V (149 mph) | 91 |
| A3 (Quattro) | 225/45R17 | 225/40R18 | 205/55R16 | V (149 mph) | 91 |
| A3 (Performance) | 225/40R18 | 235/35R19 | 225/45R17 | W (168 mph) | 92 |
| S3 | 235/35R19 | 255/30R19 | 225/40R18 | W (168 mph) | 92 |
| RS3 | 255/30R19 | 265/30R19 | 235/35R19 | Y (186 mph) | 92 |
Note: RS3 models often have staggered fitment with wider rear tires—always check your specific model.
A4 / S4 / RS4 (B8/B9 – 2008–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| A4 (FWD) | 225/50R17 | 245/40R18 | 225/50R17 | V (149 mph) | 94 |
| A4 (Quattro) | 245/40R18 | 245/35R19 | 225/50R17 | W (168 mph) | 94 |
| A4 (Performance) | 245/35R19 | 255/30R20 | 235/40R18 | W (168 mph) | 94 |
| S4 | 255/35R19 | 265/30R20 | 235/40R18 | W (168 mph) | 94 |
| RS4 | 275/30R20 | 285/30R20 | 255/35R19 | Y (186 mph) | 94 |
Note: The RS4 has a unique, aggressive fitment with very wide tires.
A5 / S5 / RS5 (8T/8W – 2007–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| A5 (FWD) | 225/50R17 | 245/40R18 | 225/50R17 | V (149 mph) | 94 |
| A5 (Quattro) | 245/40R18 | 245/35R19 | 225/50R17 | W (168 mph) | 94 |
| A5 (Performance) | 245/35R19 | 255/30R20 | 235/40R18 | W (168 mph) | 94 |
| S5 | 255/35R19 | 265/30R20 | 235/40R18 | W (168 mph) | 94 |
| RS5 | 275/30R20 | 285/30R20 | 255/35R19 | Y (186 mph) | 94 |
A6 / S6 / RS6 (C7/C8 – 2011–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| A6 (FWD) | 225/55R18 | 255/40R19 | 225/55R18 | V (149 mph) | 98 |
| A6 (Quattro) | 255/40R19 | 255/35R20 | 225/55R18 | W (168 mph) | 98 |
| A6 (Performance) | 255/35R20 | 265/30R21 | 235/50R18 | W (168 mph) | 98 |
| S6 | 255/35R20 | 265/30R21 | 235/50R18 | W (168 mph) | 98 |
| RS6 | 275/35R21 | 285/30R22 | 255/40R20 | Y (186 mph) | 98 |
Note: The RS6 requires extremely high-speed-rated tires and has massive brakes that may require 21-inch wheels.
A7 / S7 / RS7 (2012–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| A7 (FWD) | 225/55R18 | 255/40R19 | 225/55R18 | V (149 mph) | 98 |
| A7 (Quattro) | 255/40R19 | 255/35R20 | 225/55R18 | W (168 mph) | 98 |
| S7 | 255/35R20 | 265/30R21 | 235/50R18 | W (168 mph) | 98 |
| RS7 | 275/35R21 | 285/30R22 | 255/40R20 | Y (186 mph) | 98 |
Q3 (2012–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| Q3 (Base) | 215/65R17 | 235/55R18 | 215/65R17 | V (149 mph) | 98 |
| Q3 (Premium) | 235/55R18 | 255/45R19 | 215/65R17 | V (149 mph) | 98 |
| Q3 (Performance) | 255/45R19 | 255/40R20 | 235/55R18 | W (168 mph) | 98 |
Q5 / SQ5 (2010–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| Q5 (Base) | 235/65R17 | 235/60R18 | 235/65R17 | V (149 mph) | 104 |
| Q5 (Premium) | 235/60R18 | 255/50R19 | 235/65R17 | V (149 mph) | 104 |
| Q5 (Performance) | 255/50R19 | 255/45R20 | 235/60R18 | W (168 mph) | 104 |
| SQ5 | 255/45R20 | 255/40R21 | 235/60R18 | W (168 mph) | 104 |
Note: Q5 models require higher load indexes due to vehicle weight.
Q7 / SQ7 (2015–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| Q7 (Base) | 255/60R18 | 255/55R19 | 255/60R18 | V (149 mph) | 108 |
| Q7 (Premium) | 255/55R19 | 285/45R20 | 255/60R18 | V (149 mph) | 108 |
| Q7 (Performance) | 285/45R20 | 285/40R21 | 255/60R18 | W (168 mph) | 108 |
| SQ7 | 285/40R21 | 295/35R22 | 275/45R20 | W (168 mph) | 108 |
Note: The Q7 is heavy—load index is critical for safety. Never use lower-rated tires.
Q8 / SQ8 / RS Q8 (2018–Present)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| Q8 (Base) | 285/45R20 | 285/40R21 | 285/45R20 | V (149 mph) | 108 |
| Q8 (Premium) | 285/40R21 | 295/35R22 | 285/45R20 | W (168 mph) | 108 |
| SQ8 | 295/35R22 | 295/30R23 | 285/40R21 | W (168 mph) | 108 |
| RS Q8 | 295/35R23 | 295/30R23 | 285/40R21 | Y (186 mph) | 108 |
Electric Models (e-tron)
| Model | Standard Size | Alternative Size | Winter Size | Speed Rating | Load Index |
|---|---|---|---|---|---|
| Q4 e-tron | 235/55R19 | 255/45R20 | 235/55R19 | V (149 mph) | 104 |
| Q8 e-tron | 265/50R20 | 285/45R21 | 265/50R20 | V (149 mph) | 110 |
| e-tron GT | 245/45R19 (F) | 265/35R21 (F) | 245/45R19 | W (168 mph) | 98 |
| e-tron GT | 285/40R19 (R) | 305/30R21 (R) | 285/40R19 | W (168 mph) | 98 |
| RS e-tron GT | 265/35R21 (F) | 265/35R21 (F) | 265/35R21 | Y (186 mph) | 98 |
| RS e-tron GT | 305/30R21 (R) | 305/30R21 (R) | 305/30R21 | Y (186 mph) | 98 |
Note: Electric models often require EV-specific tires with reinforced sidewalls to handle the extra weight and instant torque.
The Tire Size Comparison Chart
Tire width comparison across Audi models—wider tires for more performance
Winter vs. Summer Tire Recommendations
Winter tires are not optional in cold climates—they’re essential for safety.
Why Winter Tires Matter
- Rubber compound: Stays flexible below 45°F (7°C)
- Tread design: Thousands of sipes for snow and ice grip
- Safety: Halves stopping distance in winter conditions
Winter Tire Size Selection
Rule of thumb: Use the same tire size as standard, or go one step narrower for better snow performance.
| Model | Standard Size | Recommended Winter Size | Notes |
|---|---|---|---|
| A3 | 225/40R18 | 205/55R16 | Narrower = cuts through snow better |
| A4 | 245/40R18 | 225/50R17 | Common winter setup |
| A5 | 245/40R18 | 225/50R17 | Same as A4 |
| A6 | 255/40R19 | 225/55R18 | Significant reduction for winter |
| Q5 | 255/50R19 | 235/65R17 | Taller, narrower = snow performance |
| Q7 | 285/45R20 | 255/60R18 | Heavy SUV needs dedicated winters |
| Q8 | 285/40R21 | 285/45R20 | Same width, smaller diameter |
Winter Wheel Considerations
- Smaller wheels: Provide better ride quality on winter roads
- Narrower tires: Cut through snow, reduce hydroplaning
- Steel vs. alloy: Steel wheels resist salt corrosion better
- TPMS: Don’t forget to transfer or buy new sensors
The Quattro Tire Rule
This is the most important rule in this guide.
On any Audi with Quattro all-wheel drive, all four tires must have the same rolling diameter within 1%.
Why This Matters
- Torsen center differential assumes all wheels rotate at similar speeds
- Mismatched diameters cause the differential to bind
- Binding leads to premature wear, overheating, and failure
- Repair costs: $2,000–4,000 for differential replacement
The Same Tire Rule
For Quattro vehicles:
- All four tires must be the same brand
- All four tires must be the same model
- All four tires must be the same size
- All four tires should have similar tread depth
What About Staggered Fitments?
Some performance models (RS4, RS5, RS7, R8) have staggered fitments:
- Wider tires in the rear
- Different sizes front and rear
On staggered Audis: Tires must match left-to-right on each axle, but front and rear can differ. The Quattro system still requires the overall rolling diameter to be matched within 1% front-to-rear.
Load Index and Speed Rating Guide
Minimum Speed Ratings by Model
| Model | Recommended Minimum Speed Rating |
|---|---|
| A3, A4, A5, Q3, Q5 | V (149 mph) |
| S3, S4, S5, SQ5 | W (168 mph) |
| RS3, RS4, RS5, RS6, RS7 | Y (186 mph) |
| Q7, Q8, e-tron models | V (149 mph) or W (168 mph) |
Minimum Load Index by Model
| Model | Recommended Minimum Load Index |
|---|---|
| A3, A4, A5 | 91 or 94 |
| A6, A7 | 94 or 98 |
| Q3 | 98 |
| Q5 | 104 |
| Q7, Q8 | 108 |
| e-tron models | 104–110 |
Never use a tire with a lower load index than recommended—it’s a safety hazard.
Tire Replacement Tips
When to Replace
- Tread depth below 4/32″ (winter tires: 5/32″)
- Age over 6 years (even if tread looks good)
- Visible cracks in the sidewall or tread
- Vibration or noise that doesn’t balance out
- Punctures in the shoulder area (non-repairable)
Replacing Quattro Tires
Best practice: Replace all four tires at once.
If you must replace only two:
- Place new tires on the rear axle (better stability)
- Ensure the new tires match the existing brand and model
- Check tread depth difference – should be within 2/32″
Tire Rotation
Quattro Audis: Rotate tires every 5,000–8,000 miles to ensure even wear.
Pattern: Cross-rotate (rear to front on same side, front to rear opposite side) for most Audis.
Always follow the specific rotation pattern for your model—check the owner’s manual.
Common Tire Fitment Mistakes
Mistake #1: Mixing Tire Brands on Quattro
Even if the size is identical, different brands can have slightly different rolling diameters.
Result: Differential binding, increased wear, potential failure.
Mistake #2: Using the Wrong Speed Rating
Your Audi is capable of high speeds—tires must match.
Result: Tire failure at speed, loss of control.
Mistake #3: Ignoring Load Index
Heavy Audis (Q7, e-tron) need higher load index tires.
Result: Tire failure, blowouts, loss of control.
Mistake #4: Replacing Only One Tire
On Quattro, one new tire with three worn tires is a bad idea.
Result: Different rolling diameters, differential stress.
Reference Sources
Trusted Resources for Audi Tire Information:
- Audi USA – Official Maintenance Schedules & Tire Recommendations
- Tire Rack – Tire Size & Fitment Information
- Audizine Forums – Tire & Wheel Discussions
- Nokian Tyres – Winter Tire Technology & Recommendations
What tires are you running on your Audi—summer, all-season, or dedicated winters? Share your experience in the comments—your tire choice could help another owner make the right decision for their climate and driving style. And if you’ve got tips for Quattro tire maintenance, let us know!