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[bigtow]

Hi anyone know how to work outr a wheels et . I have some 8j aftermarket alloys but they don't have the et marked on them . I have measured from across the rearmost outer edge of the wheel to the mounting flange and this is 155mm . But what is the et help please ?

[Marks DTM Calib]

I seem to recall its the distance you have measured minus half the total alloy width

[RobG]

Hi anyone know how to work outr a wheels et . I have some 8j aftermarket alloys but they don't have the et marked on them . I have measured from across the rearmost outer edge of the wheel to the mounting flange and this is 155mm . But what is the et help please ?

Answered in this thread http://www.omegaowners.com/forum/YaBB.pl?num=1274910418/0

[Marks DTM Calib]

Which confirms what I said, thanks 

[bigtow]

Thanks guys

[bigtow]

Agggggggg I hope I have worked it out wrong as I make it that the wheels have a et of 53.  Which is outside of the spec for a omega apart from getting new wheels is there any way to correct this ? 

[hotel21]

Some good info on here, with a comparator as well...

http://www.carbibles.com/tyre_bible_pg4.html

[2woody]

have just read all of that - he's correct in stating the importance of rolling radius - and then goes about adding it up the wrong way.

rolling radius CANNOT be calculated. period. The only way to establish the rolling radius is to put a tyre on the rim and measure how many times it rotates in a mile. This will be different (by up to 10%) from the figure calculated by the method on that page.

tyre manufacturers do publish wheel revs per mile, but they take a bit of getting hold of.

[Andy B]

.......

rolling radius CANNOT be calculated. period. The only way to  ......

Arrrgh! FULL STOP!!!!!!!!! USA call it a bl00dy period! ........ and breathe! 

[2woody]

I kinda wanted it to come across in the US-way, as in "extended silence to emphasise the previous point"