2015 Audi A5 Wheel Interchange

tl;dr

• Core specs: 5x112 bolt pattern, 66.6 mm center bore, M14 x 1.5 threads.
• Vehicle trims vary. Do not assume one size fits all.
• Use the on-page calculator to compare donor wheels to your A5.
• Match wheel diameter to tire diameter. Do not mix 20 inch wheels with 18 inch tires.
• Start with your door-jamb tire size, then test changes step by step.
• Confirm brake and fender clearance before driving. Torque to OEM spec.

Recommendation

I set up fitment in a simple lifecycle: baseline, compare, measure, then mount.

• Baseline: Read your door-jamb tire size. Many 2015 A5 cars show 245/40R18. Some trims use larger wheel options. Specs can vary.
• In the calculator: Set “Installed on” to 2015 Audi A5. Enter your actual wheel and tire as the baseline.
• Comparisons: For donor wheels, enter their size and offset. If you have a 20 x 9 ET29 option, enter that exactly. The calculator will sync tire diameter when you change rim diameter.
• Targets: Keep inner clearance safe, and keep outer poke within the fender. Watch scrub radius changes through offset moves.
• Hardware: Keep 5x112, hub bore 66.6 mm or larger with proper rings, and M14 x 1.5 bolts of correct seat type and length.

Impact

• Width change shifts both inner and outer positions. Wider wheels can contact liners or fenders.
• Offset change alters inner clearance and poke. Lower ET moves the wheel outward, higher ET moves inward.
• Larger diameter combos reduce sidewall and can sharpen steering. Ride can get firmer and more prone to impact damage.
• Tire diameter changes affect speedometer and gearing feel. Keep overall diameter close to stock for best results.
• Unsprung weight affects braking and ride. Lightweight, hub-centric wheels help.

Risks

• Brake caliper clearance: Spoke shape and barrel drop matter. Check physically.
• Hub fit: Audi hub is 66.6 mm. Larger wheel bores require 66.6 rings. Smaller bores will not fit.
• Seat type: Match lug bolt seat to the wheel. OE Audi often uses ball seat, many aftermarket use cone. Do not mix.
• Thread engagement: M14 x 1.5 bolts must engage fully without bottoming.
• Speedometer error: Large tire diameter shifts can trigger ABS or stability complaints.
• Fender contact: Compression, steering lock, and passengers can introduce rub that static checks miss.

Known OEM fitment inputs

Data below is what is currently available for this page. Trims and packages can differ. Use the calculator and your door-jamb sticker to confirm what your car actually has.

Note: The 20 inch rim example and the 18 inch tire example do not pair. Confirm your trim’s factory combination using the on-page calculator and OEM sources.

How to use the calculator for a safe swap

• Set “Installed on” to 2015 Audi A5.
• Enter your current wheel and tire as the baseline.
• Enter the donor wheel size and offset, or try a custom size.
• Review inner clearance change. Negative numbers mean less room to the strut or liner.
• Review outer poke change. Large positive numbers risk fender contact.
• Check overall tire diameter change. Keep it close to stock to protect ABS and gearing feel.

Checklist

• 5x112 bolt pattern confirmed.
• 66.6 mm hub bore, or quality rings if wheel bore is larger.
• M14 x 1.5 lug bolts, correct seat and length.
• Spoke-to-caliper clearance checked with a straightedge and feeler gauge.
• Fender and liner clearance checked at full lock and under load.
• Torque all fasteners to OEM spec, then re-check after 50 to 100 miles.

Gotchas

• Do not assume S-line, sport pack, and base have identical sizes.
• TPMS strategy differs by market. Keep sensors compatible and properly coded if applicable.
• Spacer use changes effective offset and bolt engagement. Account for both.
• Aftermarket wheels may need shorter or longer bolts. Measure shank depth.

Next actions

• Read your door-jamb tire size, then set the calculator baseline.
• Model your target wheel and tire. Keep diameter and offset changes modest.
• Measure brake and fender clearances before purchasing.
• Plan install with the right tools and hardware.

Helpful tools:

• Torque wrench, 1/2 inch drive
• Wheel hanger guide pin, M14 x 1.5
• Digital caliper, 0 to 150 mm
• Hub-centric rings, 66.6 mm

If any spec is unclear, confirm with the calculator on wheelinterchange.com and your Audi service information. That keeps the result safe and predictable.