Just getting some chains for a Subaru Forester and noticed that the tyre size has a suitable chain size in the "car chains" part and also the "4wd chain" section. I'm assuming these different categories are just for smaller actual chain link size for highway tyres vs a larger chain link size (16mm like the ones I have for my 4wd) for putting on 4wd tyres with bigger tread spacings etc. Is this all it is? Car chain size is 104 and 4wd chain size 240. If the Forester has highway tyres on it, I'd just go the car chain size right? Does everyone with soft roaders just do this? Surely 4wd chains on a highway tyre would make a mess of the tyre right?