The most reliable method is to enter your UK registration in the search tool, which pulls the factory fitment for your Astra GTC. You can also search by tyre size (for example 225/40 R18) if you prefer, using the sidewall markings on your current tyres or the vehicle placard.
Yes. Your Vauxhall Astra GTC tyres must meet or exceed the original speed rating and load index for safety, handling and insurance compliance. If you are unsure, stick to the specification returned by the reg search or match what is fitted now.
It is best practice to fit matching tyres on the same axle (same size, same type and ideally the same tread pattern) to keep braking and stability predictable. Mixing can affect grip and may cause uneven wear, especially on the driven axle.
In the UK the legal minimum is 1.6mm across the central three-quarters of the tyre around the full circumference. Tyres below this can fail an MOT and can be illegal to drive on, so replacing before reaching the limit is recommended.
After selecting tyres that match your Astra GTC, choose a local fitting garage and an available date and time. The tyres are then delivered to the garage for fitting, so you only need to arrive for your appointment with your car.
