[maztaim]

I was a firefighter in a past life. These were installed on all our engines and trucks. They worked OK in snowy conditions up to an inch or so, then thy stopped having enough clearance to throw under the tire. We rarely used them and made sure to follow forecasts closely and chain half our equipment in anticipation. Anecdotally, these may work OK in areas where snow is not as common or often, but wind up next to useless where they might otherwise be considered helpful.

[id02009]

Do you have any thoughts about how they help with breaking? The "rotation of the wheel rotates the chain" makes me think they'll not help during breaking that much. They would probably slip from under the tire, and the next chain would not go under...

[maztaim]

You aren’t stopping by slamming the breaks with chains, onspots, or neither. There will still need to be tire rotation to control direction. I don’t recall which was worse. Fact is snow and ice requires a lot more of everything to drive in. I stay home if I can these days.