[colport142]

Hi..picking up my new iM saturday....winter is coming...so guessing 16 steelies and what size tire is best..dont want to much variation in speedo...

 

[Kalisyohta]

For reference the 08-15 xB came with 205/55/16, same bolt pattern and everything. You could do that and according to this using 40-60mph as reference speeds you shouldn't see too much leeway.

https://tiresize.com/speedometer-calibration/