Hi All,

Got some speedline 2108 alloys on my 4 stud astra Di estate but I need to know what size the centre bores are so i can get spigot rings for them, I could measure them but only with a ruler which wouldnt be very precise at all, does anyone happen to know what I need? I know the inner diameter for 4 stud astar is 56.6mm but dont know what outer diameter i need to fit speedline 2108's

Can anyone help?