Ariens repositioned the wheel shaft since 2016 I think. Models with grey metallic wheels have repositioned wheel shaft to reduce weight on the bucket. It was done because many complained about the Auto turn reaction. Do someone tried old models and newer ones with repositioned shaft and tell me if there's a big difference with Auto turn reaction ? My brother has an older SHO Platinum 30 and moved my newer SHO 30 model. He felt the bucket was light. As I had it in late spring, I couldn't tell him if it was problem with hard packed snow.