Over all width of the bike from one side of the fairings to the other side.
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I see. The difference is all in how the fairings are designed, and it's probably one of the dimensions that should be the last thing that you should be concerned of because it really doesn't matter at all. If you were talking about the width of the gas tank, then I'd understand since that makes a bigger difference when you ride, when your thighs are against the tank.
Also when you crash...difference in tank width can mean difference between having to replace the gas tank or not lol. That's one of the things I really like about Ducatis...narrow gas tanks are awesome
2007 ZZR600 (sold)
2006 CBR600 (sold)
2010 1198 (parted out across North America)
2013 CBR500R (sold)
2009 ZX6R (race bike)
2015 R3 (project bike and future race bike)
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April 2016 and April 2017 6OTM winner!