Tyre Sizes

[The Cumbrian]

For all of you car experts out there.

The tyres on my car are currently 235 / 55 / R17. I want to buy some all season tyres, but the ones that I want aren't available in that size, the closest is 225 / 55 / R17.

Will these fit on the rims without affecting the performance?

Cheers, Michael.

 

[wingstoo]

The first set of numbers is the width of the tyre, the second is the wall depth and the third is the wheel diameter...

So the overall radius is not affected by the available size so I would say the performance should be OK, 10mm width variation will let the tyres cut in a bit deeper.

On my 110 CSW I had 750/16 tyres for when I was going to be on wet muddy ground so the tyres would cut deeper through the mud to the subsoil below, whereas on soft loose stuff the wider and lower profile tyres I had on a set of 8-spokes did the job quite well.

Hope that helps a little.

 

[santaman2000]

Yep. However be wary if you change for a wider tire as the compatibility with the rims isn't the only consideration; you also need to sonsider if there's room in the eough wheel well so as the tires don't rub the fenders.

 

[wingstoo]

The listed tyres are narrower so should be OK in the wheel arch...

 

[The Cumbrian]

Thanks very much, tyres being ordered now.

Cheers, Michael.

 

[Barn Owl]

You'll need to tell your insurance company too.
Putting different tyre sizes counts as a modification.

 

[santaman2000]

You'll need to tell your insurance company too.
Putting different tyre sizes counts as a modification.

Really!? That's different.

 

[wingstoo]

You'll need to tell your insurance company too.
Putting different tyre sizes counts as a modification.

It will be an idea to notify them, but that would also be needed for any tyre change from "Standard" for that vehicle, i.e. winter tyres instead of summer tyres, also if you change rims from steel to alloy or alloy to steel, extra lighting, change of light fittings like bulbs from standard to performance.

 

[The Cumbrian]

I've already spoken to my insurance company. As said above, they just want to be informed.

Cheers, Michael.

 

[Modchop]

Here's a handy circumference calculator...

http://www.etyres.co.uk/tyre-size-calculator

Your size difference is within the allowed +/-2.5% tolerance so will be fine, the second number is actually a percentage ratio of the first number.

Hope that helps.

 

[johnnytheboy]

Just out of interest what all seasons are you going for? I have toyed with the idea of ditching winter/summer tyre combo for a good all season tyre!

 

[The Cumbrian]

I've ordered some Falken Euro All Season A200s.

 

[The Cumbrian]

Here's the test that I found if anyone's interested:

http://webmail.tiscali.co.uk/cp/ps/...-Tyre-Test.htm&urlHash=3.570727040703702E-264


Cheers, Michael.