Tires

[Import]

Hey all…I know..but different question..my 08 vantage currently runs 255/30/20 front and 305/25/20 rears..was wondering about going 35 front and rear..little more cushioning for our tar snake roads..what’s your take..thanks for looking..

Edited by Import on Sunday 2nd April 17:30

Edited by Import on Sunday 2nd April 17:31

[LTP]

I'm willing to be proved wrong, but those sizes don't look like standard Aston fitment to me. AFAIK the '08 V8V rode on 235/40 ZR 19 fronts and 275/35 ZR 19 rear, which have considerably taller sidewalls than the sizes you quote.

Perhaps revert to standard wheels and tyres as a first step?

[Import]

The p/o put 20” HRE rims on..so the rubber reflects them..it looks fine..but man they are skinny tires..I understand that corner roll is minimized…I’m not tracking the car..just spirited driving..

[AstonV]

Import said:

Hey all…I know..but different question..my 08 vantage currently runs 255/30/20 front and 305/25/20 rears..was wondering about going 35 front and rear..little more cushioning for our tar snake roads..what’s your take..thanks for looking..

Edited by Import on Sunday 2nd April 17:30

Edited by Import on Sunday 2nd April 17:31

Everything I am reading with 20’s. Guys going 255/35/20 and 305/30/20. Sidewalls of these are close to each other. Will give 1/2” sidewall width. Should give a better ride and look a lot better.

https://tiresize.com/calculator/

Edited by AstonV on Monday 3rd April 06:33

[AdamV12V]

AstonV said:

Everything I am reading with 20’s. Guys going 255/35/20 and 305/30/20. Sidewalls of these are close to each other. Will give 1/2” sidewall width. Should give a better ride and look a lot better.

https://tiresize.com/calculator/

As this calculator shows changing wheel sizes and tyres is a mathematical challenge. Altering the profile will impact the diameter unless you flex that asl (as the profile is the percentage the height is of the width). You need to aim to ensure the diameter of the tyre is almost identical, (ideally exact) to the OEM tyres and wheels, otherwise you will impact on the accuracy of your speedo, actual top speed, acceleration, handling and even if legal may cause you insurance issues too.

Then of course you have the width of the rims to consider and what width of tyres are safe to use with them, which will reduce your options on profile even further. And finally you need to ensure the load rating of the tyres you have matches the OEM load ratings too. Get all of this wrong and your car could be illegal to drive in the UK, which of course would also invalidate your insurance.

In the UK just having non OEM wheels is likely to damage the resale of your car too, as generally the UK market strongly prefers OEM wheels on cars, unlike say in the USA where aftermarket wheels are the opposite and often seen as desirable.

All that said, the combo "AstonV" has quoted does indeed look to be the least bad combo without changing from the 20" wheels, whilst minimising any width change and improving the profile to resolve your issues.

Honestly, I would find a set of OEM 19" wheels and go back to them, ideally with OEM std sized tyres too as "LTP" also suggested above. If you really must tweak the tyres use the calculator to work out the least bad options available to you.

[Import]

Interesting…thanks for the reply’s..I will look at the calculator..here in North America..custom rims are ok..and prob the norm..

[AstonV]

AdamV12V said:

As this calculator shows changing wheel sizes and tyres is a mathematical challenge. Altering the profile will impact the diameter unless you flex that asl (as the profile is the percentage the height is of the width). You need to aim to ensure the diameter of the tyre is almost identical, (ideally exact) to the OEM tyres and wheels, otherwise you will impact on the accuracy of your speedo, actual top speed, acceleration, handling and even if legal may cause you insurance issues too.

Then of course you have the width of the rims to consider and what width of tyres are safe to use with them, which will reduce your options on profile even further. And finally you need to ensure the load rating of the tyres you have matches the OEM load ratings too. Get all of this wrong and your car could be illegal to drive in the UK, which of course would also invalidate your insurance.

In the UK just having non OEM wheels is likely to damage the resale of your car too, as generally the UK market strongly prefers OEM wheels on cars, unlike say in the USA where aftermarket wheels are the opposite and often seen as desirable.

All that said, the combo "AstonV" has quoted does indeed look to be the least bad combo without changing from the 20" wheels, whilst minimising any width change and improving the profile to resolve your issues.

Honestly, I would find a set of OEM 19" wheels and go back to them, ideally with OEM std sized tyres too as "LTP" also suggested above. If you really must tweak the tyres use the calculator to work out the least bad options available to you.

I have ordered 20" wheels and these are the sizes I have to go with to keep the same diameter as the stock 19's. I wanted to stay same sidewall as the 19's, 4", but then it will throw off the speedo and odometer. On my car the sidewalls are 4" and will be going to 3.5". Have been told the Michelin's will ride much better that the stock Bridgestone's though.

V12 Vantage stock 19's have 3.5" sidewalls, while V8's stock 19's have 4" sidewalls. AM went 1/2" less sidewall on the V12.

Edited by AstonV on Monday 3rd April 16:19

[Nbgring]

There should be OEM-wheels for the later production years from 2012 on, 245/40 ZR 19 fronts on 8.5 - 19 rims, and 285/35 ZR 19 rear on 10.0 x 19 rims, circumference and diameter larger by small amounts, slightly taller sidewalls as the early production years of the 4.3 Vantage on 235/40 ZR 19 on 8.5 - 19 fronts and 275/35 ZR 19 on 9.5 - 19 rear.
In any case the 19 inch tires have a significant impact on comfort and smoothness compared vs. 20 inch.
Another option would be OEM-wheels from the Vantage V12S with 255/35 ZR 19 fronts on 9.0 - 19 and 295/30 ZR 19 rear on 11.0 - 19.