Tyres And Wheels

[BUDDY HOLLY]

I am thinking of buying a Discovery sport hse with 20inch wheels, I don't really want 20inch I would like 18inch, My question is would there be a problem replacing the 20inch with 18inch wheels.

[bhg481]

Yes, your speedo reading would be wrong.

[davebro]

I don't think so - you just get less wheel & more tyre so the overall radius is the same. It should give a smoother ride but probably roll more on bends/corners.

Different wheel sizes are available as options on the same model of some cars.

[Ryzen]

If you change to a smaller wheel you need to make sure that the overall tyre circumference is as standard or you will get problems. Are the 20'' standard OEM? most sports come with a 18/19'' setup.

[bhg481]

Don't forget that you will have to tell your insurance company and this can cause problems at renewal when you're looking for quotes from other companies; they don't like modifications.

[BUDDY HOLLY]

20inch wheels come as standard on the HSE Discovery Sport, ifb the speedo is wrong by how much?

[davebro]

here's one with 18" wheels:

https://www.autotrader.co.uk/car-details/202111189705398?model=Discovery%20Sport&;include-delivery-option=on&advertising-location=at_cars&make=Land%20Rover&onesearchad=New&onesearchad=Nearly%20New&onesearchad=Used&radius=1501&sort=relevance&postcode=tf50nb&year-to=2022&page=1

[bhg481]

//ifb the speedo is wrong by how much?//

As Ryzen says, it depends on the tyres. If the overall diameter is the same, no difference but if the diameter is different the speedo will be wrong.

[davebro]

https://evanstire.com/considerations-for-tire-and-wheel-size-changes/#:~:text=Problems%20With%20Tire%20and%20Wheel%20Size%20Changes&text=A%20larger%20tire%20has%20a,odometer%20will%20read%20lower%2C%20too.

If you end up with a slightly smaller wheel/tyre diameter you speedo will over-read so no problem with breaking the speed limit! The effect should be minimal.

[bhg481]

But there are limits of accuracy on the speedo, so it could make the car illegal.

[ToraToraTora]

no problem just make sure you get the correct tyres so the rolling circumference is the same. if you tell me the tyre spec as is now I will tell you what you need for the 18 inch wheels.

[davebro]

https://alloywheels.com/tyreCalculator