How to measure Wheel offset.

[75wagon]

Here is a good read on how to calculate and understand wheel offset and it's measurement.
https://www.rsracing.com/tech-wheel.html


I've done some measuring and here is what I have come up with.

Note:
Wheel: Style/type
Size: Rim Diameter and width
FS: Front spacing
BS: Back spacing
Offset : Formula: FS + BS divided by 2, then minus FS = offset (+ is positive, - is negative)




Wheel: Cheviot Hustlers (same as on my wagon)
Size: 13 x 6 inches
FS: 85mm
BS: 95mm
Offset : +5mm

Even though this rim is a 13 x 6 inch rim, the actual sizes are different. The 13 x 6 inch measurement is taken between the bead seats, They don't include the outer flanges.

6 inches from inner to outer bead seat (150mm)


7 inches overall including the outer flanges (180mm)


Overall Diameter 14 1/3 inches (365mm)


To measure Front spacing, measure through the centre bore from the mounting pad


To measure the Rear spacing, measure from the mounting pad


Other Rims I have laying around that I have measured.


Wheel: Standard Galant Rims
Size: 13 x 4.5 inches
FS: 35mm
BS: 110mm
Offset : +37.5mm



Wheel: Standard fitment steel GH Sigma rims
Size: 14 x 5 inches
FS: 55mm
BS: 110mm
Offset : +27.5mm



Wheel: Superlites
Size: 14 x 6 inches
FS: 65mm
BS: 115mm
Offset : +25mm



Wheel: Bathurst Mk1
Size: 13 x 6 inches
FS: 70mm
BS: 110mm
Offset : +20mm



Wheel: Standard fitment FWD Colt rims
Size: 13x 5 inches
FS: 35mm
BS: 120mm
Offset : +42.5mm


If you want to add sizing for more rims, copy and paste this to put up the sizes.

Code: Select all

[color=#FF8000][b]Wheel:[/b][/color]
[color=#FF8000]Size:[/color]
[color=#FF8000]FS:[/color] 
[color=#FF8000]BS:[/color]
[color=#FF8000]Offset :[/color] 

There is also another factor to wheel offset, and that is strut choice. Eg: If you have a modified Galant or Lancer, fitting Sigma/Scorpian struts changes your front wheel track.
For differences read this topic Strut offset differences

Dave...