Currently got 275/45 R21 Scorpions on my L405, but it's pretty crashy over potholes and ruts, etc. Don't really want to go down to 20" wheels, so was thinking of fitting 275/50 tyres instead, for a bit more sidewall.
My 405 was on 22`s when I got it. It was awful. I have gone down to 21`s now and the ride is much better. It seems to handle better through the bends too.