Just had a question about the speedo. I have never read a motorcycle manual in my life, so this is a first for me. (Maybe I am reading it wrong) I saw in the manual that the speedo displays the actual speed at 5% off. Is that common practice for all motorcycles? Ducati? Is there a specific reason for this? I realize the speed can be off due to tire size changes, etc, but what is the purpose of setting it up initially at 5% off?