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[db0mbase]

Im trying to use the wheel offset calc but not sure what to put in "current wheel offset"

current setup:

F: 225/40/18
R: 255/35/18
offset: ?

Car has xDrive and i want to mount on the following. Trying to see if rolling diameter will be around 1% to avoid TC issues/stress.

F: 235/35/19
R: 265/30/19
Offset - +30F, +37Rmm

http://www.wheeldude.com/catalog/pro...oducts_id=6410

[bmw325i]

Those tire sizes are fine, but 235/35/19 and 275/30/19 is a better match. The 265 would look kind of stretched on a 10" wheel.

[db0mbase]

Thanks for the input. I found out the factory offset of my rims are +34 front and +37 rear.

Ran the calc and 0.92% in rear and 1.5% difference in front. TC should be fine

[bmw325i]

With the 265 the difference from front to rear is .857% with the 275 the difference is .077%. It needs to be under 1%.

[db0mbase]

Am i using the calc wrong?

in the calculator i put:

-current front wheel width: 8
-current front offset: 34
-current front tire size: 225/40/18

-new front wheel width: 8.5
-new front wheel offset: 30
-new front wheel tire size: 235/35/19

= 1.5% difference

-current rear wheel width: 8.5
-current rear wheel offset: 37
-current rear wheel tire size: 255/35/18

-new rear wheel width: 10
-new rear wheel offset: 37
-new rear wheel tire size: 265/30/19

= 0.92% difference

[bmw325i]

Originally Posted by db0mbase

Am i using the calc wrong?

in the calculator i put:

-current front wheel width: 8
-current front offset: 34
-current front tire size: 225/40/18

-new front wheel width: 8.5
-new front wheel offset: 30
-new front wheel tire size: 235/35/19

= 1.5% difference

-current rear wheel width: 8.5
-current rear wheel offset: 37
-current rear wheel tire size: 255/35/18

-new rear wheel width: 10
-new rear wheel offset: 37
-new rear wheel tire size: 265/30/19

= 0.92% difference

Compare the difference between the front and rear tires. That is what matters. 235/35/19 and 275/30/19 is the closest match and what will look best on those wheel sizes.

[db0mbase]

Originally Posted by bmw325i

Compare the difference between the front and rear tires. That is what matters. 235/35/19 and 275/30/19 is the closest match and what will look best on those wheel sizes.

so with 265s the difference between the front and rear is 0.6%

with 275's it's 0.9% (closer to 1%) which is why you are suggesting is better? right? lol

[bmw325i]

Originally Posted by db0mbase

so with 265s the difference between the front and rear is 0.6%

with 275's it's 0.9% (closer to 1%) which is why you are suggesting is better? right? lol

Originally Posted by bmw325i

With the 265 the difference from front to rear is .857% with the 275 the difference is .077%. It needs to be under 1%.

The 275 is almost a perfect match and also there is 1 1/2" difference in width between the front and rear wheels. 1 1/2"=38mm 275-235=40mm. So that is why I said the 275 would be the best choice. With the 265 the rear tire will be a little stretched.