When do you consider it too windy to ride?

Depends on the route. 20 gusting to 30kph is a pretty typical day here. Once you get to sustained winds greater than 30kph it’s not really fun anymore. 40 gusting to 60 I will avoid unless I have a somewhat sheltered route to go against the wind. That’s about the speed where gusts will push me around a bit on my 50mm deep winds.