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Discussion Starter · #1 ·
Hi,

Does anyone know whether it would be possible to fit wider tyres to my existing 18" wheels?

The tyres are currently 225/40/18. It looks as if the arches could accommodate slightly wider tyres and I'd thought about moving up to 235s?

Thanks
 

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You need to check the rolling radius is the same. You may need to reduce the profile to a 35 instead of a 40. I think there are clearances to allow snow chains on 17s maximum.
 

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Discussion Starter · #3 ·
You need to check the rolling radius is the same. You may need to reduce the profile to a 35 instead of a 40. I think there are clearances to allow snow chains on 17s maximum.
Thank you

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Wouldn't the profile of the tyre need to be the same?
He's got 225/40/18's so to go wider without affecting the radius he'd need 235/40/18's surely?
I wondered the same for mine when it comes to renewal.
:)
 

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The sidewall height of a 225/40 is 40% of 225 mm.
If the width increases to 235 the percentage must reduce to maintain the sidewall height perhaps to 35%
There are charts that show the rolling radius of different tyres with widths and aspect ratios.
 

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The sidewall height of a 225/40 is 40% of 225 mm.
If the width increases to 235 the percentage must reduce to maintain the sidewall height perhaps to 35%
There are charts that show the rolling radius of different tyres with widths and aspect ratios.
I was not aware of that.
:)
 

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Hi,



Does anyone know whether it would be possible to fit wider tyres to my existing 18" wheels?



The tyres are currently 225/40/18. It looks as if the arches could accommodate slightly wider tyres and I'd thought about moving up to 235s?



Thanks
I'd lower the car rather than put the wrong tyres on.

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