Trying to sell a set of 17" winter wheels/tires (is41) to a colleague. Car is brand new and he has the standard wheel set-up. I checked that the hub on his car is 72.6mm, so ok there, but I forgot to check the IS number as we were in a parking garage and pressed for time.

My guess is that they are in the range 35 - 42 but not quite sure of that.