offset explanation for an idiot please
offset explanation for an idiot please
Author
Discussion

rstsye

Original Poster:

25 posts

291 months

Friday 18th February 2011
quotequote all
hi all,
ive just done a search on chimaera offset as im lookin to put aftermarket 17's on.
ive found some local off a sierra cossy but they are et13.
i read an offset explanation online about zero offset etc but i didnt really get the jist of what it was saying.
i read standard offset for a chim is 35 so does that stick out more than a 13 or not as much

could someone explain it to me in laymans(idiot) terms please

thanx in advance for any help

sye(new chim owner)

Number 7

4,113 posts

291 months

Friday 18th February 2011
quotequote all
rstsye said:
hi all,
ive just done a search on chimaera offset as im lookin to put aftermarket 17's on.
ive found some local off a sierra cossy but they are et13.
i read an offset explanation online about zero offset etc but i didnt really get the jist of what it was saying.
i read standard offset for a chim is 35 so does that stick out more than a 13 or not as much

could someone explain it to me in laymans(idiot) terms please

thanx in advance for any help

sye(new chim owner)
As you've probably read, offset is the relationship (stated in mm ) between the centre-line of the wheel and the wheel mounting face. To make comparisons, you would need to know the width of the wheels (overall, not just tyre mounting points, i.e an 8" wide wheel is going to be around 9" overall width), and whether the quoted offset is negative or positive. If there is no offset, the centre line of the wheel coincides with the wheel mounting face.

JR

14,332 posts

287 months

Friday 18th February 2011
quotequote all
Oh dear, this has not been a good start for you. Offset is independant of the width of the wheels.

The lower the number the more the wheels will stick out. ET13 is no use to you. Ideally you want ET25f&ET33or35r. It is easier to remember by reading ET as 'the amount pressed in' or 'einpresstieffe' - ET - in german.

FWIW most of the 17" wheels seem to be for the Corsa market and as such are 7" wide whereas you want 8 to 9" wide depending on tyre size.

Number 7

4,113 posts

291 months

Friday 18th February 2011
quotequote all
JR said:
Oh dear, this has not been a good start for you. Offset is independant of the width of the wheels.

The lower the number the more the wheels will stick out. ET13 is no use to you. Ideally you want ET25f&ET33or35r. It is easier to remember by reading ET as 'the amount pressed in' or 'einpresstieffe' - ET - in german.

FWIW most of the 17" wheels seem to be for the Corsa market and as such are 7" wide whereas you want 8 to 9" wide depending on tyre size.
Maybe I haven't quite got a grasp of it then. Surely a 6" wheel and a 9" wheel (both with the same offset) will differ in the extent to which they stick in or out by ? And don't you need to know whether the offset is positive or negative?

ThePrisoner

1,076 posts

237 months

Friday 18th February 2011
quotequote all

fredd1e

783 posts

249 months

Friday 18th February 2011
quotequote all
Number 7 said:
Maybe I haven't quite got a grasp of it then. Surely a 6" wheel and a 9" wheel (both with the same offset) will differ in the extent to which they stick in or out by ? And don't you need to know whether the offset is positive or negative?
They will and yes +ve or -ve is needed , but in reality 99.999999~ percent of wheels are negative offset except if its a wierd offroad/dragster etc rim
this site has a nice picture
http://www.1010tires.com/WheelOffsetCalculator.asp

Number 7

4,113 posts

291 months

Friday 18th February 2011
quotequote all
fredd1e said:
They will and yes +ve or -ve is needed , but in reality 99.999999~ percent of wheels are negative offset except if its a wierd offroad/dragster etc rim
this site has a nice picture
http://www.1010tires.com/WheelOffsetCalculator.asp
Mr. Interweb suggests that most wheels tend to have positive offset, not negative. My O.Z. split rims are positive in both sizes.

fredd1e

783 posts

249 months

Friday 18th February 2011
quotequote all
Number 7 said:
Mr. Interweb suggests that most wheels tend to have positive offset, not negative. My O.Z. split rims are positive in both sizes.
Lol yes off course its correct its on the t'interweb....

Number 7

4,113 posts

291 months

Saturday 19th February 2011
quotequote all
fredd1e said:
Lol yes off course its correct its on the t'interweb....
Only trying to be helpful to the OP, but I bow to your superior knowledge on the subject. I guess that my car, along with every Wedge ever built, and a significant number of Mercs (similar fitment) must all in the 0.0000001% of cars with positive offset wheels. Are the wheels on your TVR negative offset?