BradC;50626 wrote240 lugs are imperial, 740/940 are metric. It took me destroying a 740 lug and a 240 nut with an impact gun to learn that lesson. I must have left my brain in the jar beside the bed that day.
But why would Volvo do that? According to Wikipedia (!) "The metric system was adopted by law on 22 November 1878. This law stated that the introduction should take place progressively from 1879 to 1888, and that the metric system should be used exclusively from the beginning of 1889."
So it's not because it's a hangover from the 140 series or something like that. Just one of those things, I guess.