Continental MC7 245/40R19 and 255/40R19 on a BMW 420i
Quick answer: This BMW 420i Gran Coupé was fitted with Continental MaxContact MC7 tyres in 245/40R19 at the front and 255/40R19 at the rear, mounted to 19-inch RAYS Gram Lights 57CR wheels.
Direct product links for both tyre sizes
- Front: 245/40R19 98Y XL Continental MaxContact MC7
- Rear: 255/40R19 100Y XL Continental MaxContact MC7
Check the live product pages or contact the store for current price, stock and fitting inclusions. A product being listed online does not confirm that it suits every BMW.
What does 245/40R19 mean?
In the size 245/40R19:
- 245 is the nominal section width in millimetres;
- 40 is the aspect ratio;
- R indicates radial construction;
- 19 is the wheel diameter in inches.
The rear 255/40R19 follows the same format and is nominally wider. Load and speed ratings are also part of tyre selection and must meet the vehicle's requirements.
Why use different front and rear sizes?
This photographed BMW uses a staggered setup, with a wider rear tyre. Staggered packages can support the intended wheel widths and vehicle stance, but they also require correct front-to-rear placement. They generally cannot be rotated front-to-rear in the same way as four identical wheels and tyres.
Do not assume these two sizes are original equipment for every BMW 420i. Before changing from the placard or factory specification, verify overall diameter, load rating, clearance and legal suitability for the exact vehicle.
Continental MC7 for Adelaide driving
For a road-going performance car, tyre choice should account for dry summer heat, wet winter roads, braking, steering response and everyday comfort. The most important point is not the brand name alone: the tyre must be the correct size and specification, fitted correctly and maintained at the vehicle manufacturer's recommended cold pressure.
Drivers should inspect tread condition and pressure regularly, especially before Adelaide Hills driving or longer South Australian trips. If there is vibration, pulling, damage or rapid pressure loss, arrange a professional inspection rather than continuing to drive.
Protecting new MC7 tyres with alignment checks
Uneven shoulder wear, feathering, pulling or an off-centre steering wheel can indicate that geometry needs attention. A measured wheel alignment in Adelaide helps determine whether toe and other adjustable angles are within the appropriate specification.
Tyre pressure, worn suspension components, wheel balance and alignment are different issues, so diagnosis should identify the cause before adjustment.
Frequently asked questions
Can 245/40R19 and 255/40R19 tyres be rotated front to rear?
Not as a normal front-to-rear rotation when the front and rear sizes differ. Rotation options also depend on wheel widths and whether the tyres are directional or asymmetric.
Are these Continental MC7 tyres run-flat?
The linked products should not be assumed to be run-flat unless the product specification explicitly says so. Confirm the required tyre construction and vehicle mobility system before replacing factory tyres.
Will these sizes fit my BMW 420i?
They fit the real vehicle shown, but suitability for another 420i requires confirmation of generation, wheel width, offset, clearance, load requirements and overall diameter.
Buy Continental tyres in Magill
For a size and fitment check, contact Autosport Tyre World Magill, 647 Magill Road, Magill SA 5072, on 0452 641 023. We can verify the vehicle details before you order the front and rear tyres.