My tire guy suggested this combo for the Pirelli 240 Winter Snowsports when he realized he couldn't get any Blizzak LM-22's in the factory staggering.

245/45R18 (stock) diameter = 26.7"

225/45R18 (stock) diameter = 26.0" Difference from Rear = 0.7"
235/40R18 diameter = 25.4" Difference from Rear = 1.3"

I've read about the 0.5" - 0.75" rule for VDC, which I have and which I want to work in the winter.

If you interpret this to mean that the difference between front and rear must be between 0.5" and 0.75", then the stock config works but the one suggested by my tire guy does not.

If you interpret this to mean that you can not deviate from the stock differential of 0.7" by more than 0.5" to 0.75" then my tire guy's suggestion is ok. But why would anybody put a lower end (0.5") on such a statement? If the max you can deviate is 0.75" then wouldn't an acceptable range be 0" to 0.75"?

If you interpret this to mean that you can not deviate from either of the stock sizes by more than 0.5" to 0.75" then my tire guy's suggestion is ok. Again, why would anybody put a lower end on such a statement?

I guess I will just ask if anybody has used the combo suggested by my tire guy and if so, have they had any problems with VDC?

Any feedback appreciated.

Thanks,
Elmer

 

The LM-22 is available in the factory size for both the front and rear from TireRack. You can order it from TireRack and have it shipped directly to your tire guy for mounting and balancing.

But my suggestion is to find a different tire guy. The one you're currently working with is giving you bad info.

Gary

 

TireRack does not currently have availability on the tire in one of the sizes (can't remember which one).

My tire guy can get the LM-22's in the correct sizes but currently the warehouse is out of stock. Apparently, the LM-22's in the correct sizes are coming from Japan but availability is sketchy at best.

Elmer.

 

wat u mean by the .5~.75 rule for vdc?

 

Do a search on "staggering" and you should come up with a bunch of posts, one of which involves a member contacting Nissan and them replying with the 0.5" - 0.75" rule. Interpreting the rule seems to have caused some confusion though.

Elmer.