Variable effort, by the way, means that the effort required to turn the steering wheel changes with the speed of the vehicle. (articles.orlandosentinel.com)
The advantages over a conventional five - hole screwed fitting include better driving dynamics and performance thanks to fewer rotating masses and, of course, faster wheel changes. (topspeed.com)
That's why it's recommended to check tension after 100 km or so after wheel change. (mechanics.stackexchange.com)