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!
if an offset is low
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
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
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bstardchild
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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!!!
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!!!
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bstardchild
- Moderator
- Posts: 3057
- Joined: Sun Mar 28, 2004 9:53 pm
- Location: Norfolk - "Its just Black & Dirty"
V a set of std wheelsmitty wrote:what bout offsets of 7x15 et16 fronts
8x15 et18 rears
what would this do, if i were to fit them on??
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.
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bstardchild
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- Joined: Sun Mar 28, 2004 9:53 pm
- Location: Norfolk - "Its just Black & Dirty"
remove plastic arch liners - freemitty 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
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