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Discussion Starter · #1 ·
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?
Scrambler Speedo.JPG
 

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It's against the 'construction and use' laws for a manufacturer to supply a vehicle where the speedo reads less than the actual speed traveled. This makes it quite difficult for a manufacturer to get it spot on but never read less. The answer is to build in a tolerance in favour of it reading over speed.
 

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It's also against the regulations for it to read more than 10% fast. So 5% over seems like a good compromise.
 

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Speedos (not the swimwear) used to always be 10% out. They've obviously reined it in.
 
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