Almost everything you need to know about wheels, pcd, offset, hub diameter

[blacktop]

ok after having some trouble in the past with wheels sizing, pcd's, offset, hub Diameter's and all that gear I decided to make a list of everything I could find on the net and condense it into one easy to use post and Excel spreadsheet.

1,How to measure your PCD (Pitch Circle Diameter)
2, Measuring Offset
3, Choosing the right tire and wheel size
4, Car models PCD, Offset & Hub Diameter list

the spreadsheet contains a list of vahicle makes and models and there associated PCD - Offset - Hub Diameter

and hopefully it will answer a few questions

now I know there have been a few posts in the past about this, but there not very comprehensive compared to this.

*Disclaimer* I take no responsibility for wrong or misleading information, this information has been gathered from the internet from various sources.



How to measure your PCD (Pitch Circle Diameter)

3 STUD
Measure the distance X between the centres of 2 holes and multiply by 1.154


4 STUD
Measure the distance between the centres of 2 OPPOSITE holes
OR
Measure the distance between the centres of 2 ADJACENT holes and multiply by 1.414


5 STUD
Measure the distance X between the centres of 2 ADJACENT holes and multiply by 1.7012


6 STUD
Measure the distance between the centres of 2 OPPOSITE holes
OR
Measure the distance X between the centres of 2 adjacent holes and multiply by 2





Measuring Offset
Offset is often referred to as ET which stands for EinpressTieffe in German

OFFSET = BACKSPACE - ½(RIM WIDTH)
or
C = B - A

Positive Offset


Negative Offset





Choosing the right tire and wheel size
Matching overall diameters when changing wheel & tyre sizes
is necessary to ensure ride height and gearing don't change

Tire size calculator
http://www.tyresave.co.uk/tyresize.html

Wheels offset calculator
http://www.1010tires.com/WheelOffsetCalculator.asp




Car models PCD, Offset & Hub Diameter list
Be sure to check the different tab's at the bottom left corner of the spreadsheet, as none of list are identical.





To download the file enter the unique code in the top right of this link and press download

http://www.megaupload.com/?d=VNT1F50O


if you don't have Excel you can download an Excel spreadsheet viewer from the internet for free

[blacktop]

please feel free to add any missing information

[GtiRboy]

this looks awesome...i never knew any of this..thanks!

[wagonist]

I couldn't figure out how to update the spreadsheet

Subaru: Leone sedan, wagon, coupe, brumby 1971 - 1994 4 x 140 offset 45
Subaru Vortex (4cyl) 1985 - 1990: 4 x 140 offset 45
Subaru Vortex (6 cyl) 1987 - 1990: 5 x 100 offset 45
Subaru SVX: 1991 - 1995: 5 x 114.3 offset 48
Subaru WRX Sti: 2003 - : 5 x 114.3 offset 48

[blacktop]

thats cool mate I'll update it and re upload

first post updated with new info

[WDE_BDY]

To measure offset -
Pull the wheel off and lay it face up on flat ground.
Measure from ground to the hub mounting face (call this A), then flip over and do the same (call this B, make sure this is still to the same mounting face). Add A and B together and divide in half (call this C). The difference between C and A is your offset, If A is more than C the offset is positive if less its negative.
Can be done with tyres on as they will bulge the same each side giving you the same centreline, you need to be pretty accurate with your measuring though.

Callum