There is a wide variation in the motorcycle stats between the various categories of bikes i.e. cruiser, tourer, sportbike, etc.. There's also a wide variation in the type of rider between the categories i.e. sportbikes = mostly youngsters, etc.
There is also wide variation due to geography- up north = short riding season and elsewhere can = year round biking.
I used 4000 miles/year for bikes and 14,000 miles/year for cages.
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