Dim "Formatting: Distance Display:" only has Decimal and Feet & Inches despite system units being set to Centimeters...

 From:  Frenchy Pilou (PILOU)
10860.2 In reply to 10860.1 
Select your Dimension
Open Detail (usually up right page corner)
Write cm (with a space first) after "Text <>"

So you will have <-------- 3.14159265359 cm ------------> cm between some arrows! ;)