If anyone is interested, I have four 16” alloys fitted with good quality winter tyres - Nexen Winguard snow G2 205/60/16 rolling radius, suits Lexus with 18” wheels. Tread depth 6mm. I’ve used the wheels on my previous IS220d Sport and my current IS300h F Sport and the combination has been really good in the snow. Less commuting now, so not needed any longer. Photos and more details available if you are interested….Phil