Tyre Profile

[Ultraviolet]

All

I've finally got sick of the run flats on my 535d Sport Touring and am looking to get them replaced.

I'm thinking of increasing the profile slightly from 245/40/R18Y to 245/45/R18Y. Is this advisable? My feeling is this may further improve the ride quality and help prevent further scrapes on curbs etc.

Also, any thoughts on which tyres to go for? I'm aiming primarily for low road noise and ride quality (rather than out-and-out performance).... any thoughts?

any suggestions/ comments would be welcome,

UV

[mmm-five]

Don't increase the profile without considering what it's going to do to your speedometer reading.

If you want a softer ride then just going to non-runflats will help a lot, as will swapping your 18" wheels for 17" wheels with higher profile tyres (245/45/17 is very close to the same overall circumference).

Edited by mmm-five on Saturday 26th August 14:22

[aeroresh]

You'll be out an additional 4% on your speedometer. Previous indicated 60 mph will now be real 63 mph.

Wouldnt think you'd have any rubbing issues if you're running standard suspension.

However you may wish to consider your insurance. If you deviate from manufacturers spec and are involved in an accident, they could refuse to pay out.

[wrightybm]

Dunno whether this will be of any help to you, but this link should take you to a tyre size calculator: www.powerdog.com/tiresize.cgi

Helps to check the rolling circumference of the new and old wheels & tyres are as close as possible.