If I have an 8" wide wheel with 4.5" backspacing. What is the offset?

[yellow95]

By my calculations, its et13. Is that correct?


Gary

[Karl Buchka]

Looks like it.

[Volvo Heretic]

Take the 8" width, (inside wheel lip to inside wheel lip(where the tire seats to the wheel)), and add the two wheel edge lips (1/2" ea.?) gives you a 9" wheels (outside to outside). Subtract the backspacing from the wheel width; 9" - 4.5" = 4.5". Subtract the difference from 1/2 the wheel width ((9" / 2 = 4.5") - 4.5" = 0") You have an et0 wheel.

[yellow95]

Well that blows. Thanks for the info. You saved me some change.

Gary

[DaytonAE86]

Take the 8" width, (inside wheel lip to inside wheel lip(where the tire seats to the wheel)), and add the two wheel edge lips (1/2" ea.?) gives you a 9" wheels (outside to outside). Subtract the backspacing from the wheel width; 9" - 4.5" = 4.5". Subtract the difference from 1/2 the wheel width ((9" / 2 = 4.5") - 4.5" = 0") You have an et0 wheel.

Finally someone who knows the proper way to convert backspacing to offset. Though some wheels go by lip to lip, its generally accepted that the width is seat to seat.

Why is this so hard for some to understand and grasp, the conversion from inches to mm isn't hard either (25.4 per inch).

[Nils]

yup, its 8" et 0 ...which should fit on a 240.

goes inwards towards the strut 11.43 mm
8.5 et 13 fits and goes inwards 13,365 mm

8" with 4.5" backspacing go outwards 11.43
8.5 et 13 goes outwards 10.765 mm

thats only 6 mm further outwards than Super DTM's

if you use the right tire that shouldnt give any problems unless you lowered your car like crazy

[yellow95]

yup, its 8" et 0 ...which should fit on a 240.

goes inwards towards the strut 11.43 mm
8.5 et 13 fits and goes inwards 13,365 mm

8" with 4.5" backspacing go outwards 11.43
8.5 et 13 goes outwards 10.765 mm

thats only 6 mm further outwards than Super DTM's

if you use the right tire that shouldnt give any problems unless you lowered your car like crazy

Really? That was my concern, that they might contact the strut.

Hmmmm

Gary