Tyre size question..18"

[Gmac]

Quick question...

I'm planning new putting H&R lowering springs on and also putting a set of 18" wheels on which are 8j wide..

They come with 235/40/18 tyres... I know normally we'd be looking for 225, but will the 235 cause any rubbing issues????

TIA

[pudding]

It might throw the speedo out a little as the sidewall height is a percentage of the width.

[jayha11]

Few things that will help:

Whats the offset of the wheels?
Are the springs 30mm drop?

[Gmac]

Few things that will help:

Whats the offset of the wheels?
Are the springs 30mm drop?

The offset is et43, and the drop is indeed 30mm...

[jaffa]

Probably rub with the 235's
Doing the screw mod will give you a few mm's clearance but you should get some 225's


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[sub39h]

It might throw the speedo out a little as the sidewall height is a percentage of the width.

I do agree that you should run the right size tyre, but the difference is negligible - 4mm radius or less than 1mph difference at 70mph

http://www.brspecialtuning.co.uk/Tyre%20size%20calculator.htm

[jayha11]

Few things that will help:

Whats the offset of the wheels?
Are the springs 30mm drop?

The offset is et43, and the drop is indeed 30mm...

Just to give you some perspective I am running the following...

18x8j ET35 (stick out 8mm further than yours)
lowered approx 65mm front & back
Tyre's are 215x40x18 to aid with tucking at the rear

Is there a specific reason you want to run 235 tyre's?
 

[Gmac]

Yeh, the wheels that are for sale come with 235's.  I've currently got 17" wheels and tyres.

[Gmac]

Probably rub with the 235's
Doing the screw mod will give you a few mm's clearance but you should get some 225's


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Will do a search for the 'screw mod'. 

[pudding]

It might throw the speedo out a little as the sidewall height is a percentage of the width.

I do agree that you should run the right size tyre, but the difference is negligible - 4mm radius or less than 1mph difference at 70mph

http://www.brspecialtuning.co.uk/Tyre%20size%20calculator.htm

Yeah it's very minor usually, but sometimes one tyre maker's '235' is a bit different to another's.   I usually find taller tyres than standard affect the gearing and unsprung mass more than anything else though!