Bigger rims change the look of your car straight away. But a bigger rim also means a different tyre. Here's how to get it right.
The outer diameter must stay the same
When your rim gets bigger, the tyre's sidewall must get lower. That keeps the total outer diameter about the same. The rule: at most 2% difference from the original size.
An example: from 205/55 R16 to 225/45 R17 or 225/40 R18.
Pros
- Sportier look
- A lower sidewall steers more directly and leans less in corners
- More room for bigger brakes
Cons
- Less comfort: a lower sidewall absorbs fewer bumps.
- More risk of damage: kerbs and potholes hit your rim sooner.
- More expensive: tyres for big rims cost more.
- More noise, and sometimes slightly higher consumption.
Technical points
- Bolt pattern: the number of bolts and the distance between them, for example 5x112.
- Centre bore: must fit your car's hub, with centring rings if needed.
- Offset (ET): determines how far out the wheel sits.
- Load capacity of the rim and the tyre.
- TPMS: if your car has tyre pressure sensors, they need to move over.
And the inspection?
If you choose a size within the 2% rule and everything fits without rubbing, there is usually no problem. In doubt? We find a combination that is certainly compliant.
We work out the right rim and tyre combination for you and fit everything in one go.
