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if an offset of tyres is 15 for example what effect will it have on my car when i ry and put them on??

eg, rub or worse not fit on!

Tyres dont have an offset

my wheels are ET23 and they fit fine the only bad thing about a high offset is the wheels will stick out from the arches. and it causes wheel bearings to wear faster.


if you were talking of tyre sizes then to bigger profile and it will rub eg
if a 175/65 15 rubs ( probly will with any lowering) then you can run a 175/45 15 and it wont rub

what bout offsets of 7x15 et16 fronts
8x15 et18 rears

what would this do, if i were to fit them on??

Come on guys - google is great for getting information

Even a search on here should reveal helpfull info as this subject has come up many times

Here a start

Offset is the relationship between the hub mounting face of the wheel and the centreline of the wheel

It's primary function is to ensure the centreline of the wheel is over the hub bearing so excessive load on the bearings is reduced

Offset - Whist it isn't affected by the width of the wheel - the width of the wheel will have an effect on clearances and should be considered along with offset values when looking at alternative wheels

Wheels with lower or even negative offsets compared to original fitment will stick out more and have a greather wheel to strut clearance but a reduced wheel arch clearance

Wheels with higher offsets will be further in the arches so will have an increased wheel arch clearance but reduce the wheel to strut clearance

So as an example a std wheel and tyre combination

ET 43 6.5J Rim and 15 inch diameter fitted with 195/45 tyres

Changed to

ET 33 6.5J Rim and 15 inch diameter fitted with 195/45 tyres

Will result in a wheel that is further out by 10mm so you need to make sure it isn't going to foul the arches

Changed to

ET 49 6.5J Rim and 15 inch diameter fitted with 195/45 tyres

Will result in a wheel that is further in by 6mm so you need to make sure it's not going to foul the strut or the roll bars on full lock

If you change the width of the rim but the offset remains the same

ie from

ET 43 6.5J Rim and 15 inch diameter fitted with 195/45 tyres

to

ET 43 7.5J Rim and 15 inch diameter fitted with 195/45 tyres

Then the rim will be further out by 12mm and also have 12mm reduced clearance between the inside edge and the strut or any other part of the car that comes close

The Golden rule with all this stuff is

either go for an exact match on the OE spec

or

Measure the clearances you currently have to decide just what you have to play with in terms of clearances abnd then make a decision based on that information

Not a rant but just saying I've bought a set of 15's to replace my 14's will they rub is about as usefull as a chocolate fireguard!!!

mitty wrote:what bout offsets of 7x15 et16 fronts
8x15 et18 rears

what would this do, if i were to fit them on??

V a set of std wheels

I'd say that the fronts and rears are gonna rub like hell unless you put some stretch on the tyres by reducing the width and you don't lower it too much.

Fronts

Thats a 27mm change in Offset added to a 6mm increase on the outer face as a result of rim width change - rim face will be 33mm further out!!

I would think strut clearance would not be a problem but wheel arch clearance certainly would be.

Rears

Thats a 25mm change in Offset added to a 18mm increase on the outer face as a result of rim width change - rim face will be 43mm further out!!

I would think strut clearance would not be a problem but wheel arch clearance certainly would be.

if wheel arch clearence is going to be a problem ( in this case it most likely will be) whats the best thing i can do to resolve it and how much will it cost lol
cheers

mitty wrote:if wheel arch clearence is going to be a problem ( in this case it most likely will be) whats the best thing i can do to resolve it and how much will it cost lol
cheers

remove plastic arch liners - free

Roll the arches

Home method requires baseball bat - heat gun, time and patience - free

Body shop method - depends on how much rolling and if you can find someone to take it on