Choose your bicycle and press continue.
If you push i button, you can see the video of the way of measuring value.
The body differ from everyone, so it is not an absolute way,
However, it at least helps frame selection, height adjustment, and stem selection.
When you apply doval chainring, it may demand a little bit different value.
All measured values are starting from standard,
you may modify deviation about your inconvenience while you ride.
Here is the link - http://www.competitivecyclist.com/Store/catalog/fitCalculatorBike.jsp?INT_ID=IB12809#type
Original text by Tony Morrison in Doval Official Cafe