225/75r16 would be 225mm wide then to get the height you divide 225 by 100 and multiply by the 75 which gives you the profile of 168.75mm so overall tyre height is 168.75mm multiplied by two plus the rim height
so 16" is 406.4mm plus 337.5mm is 743.9mm which makes it 29.28" tall and 225mm wide which is 8.85" wide
Just apply the same idea for the other sizes to get the dimensions you require.
The Dakar is a pretty good tyre for the money, I had a set of 265/75r16's on a disco which seen well over 20,000 miles and were sold on after that.
Go for them???