22" here in Charlottesville, VA. I turned my BB around on my 3430HSTC and did my 1.25 mile driveway in reverse in about 7 hours. The blade worked surprisingly well when it was angled, but I didn't get very good traction with my R4s so I had to do everything downhill. I was going to buy some chains until I heard about the spacing issue. Are spacers required on the 3430HSTC as well?