Although dont own a Tenere but read quiet alot about them it really does all depend on who you are as some people think it buffets other get the same but say its ok, hieght or the person is a changable one as peoples spines, legs etc are all different lengths putting there head, knees, arms etc into different places causing turblence and different wind flows, also size or roundness as someone called it the other day also effects it.

But im sure someone will be along to help you with a rough esitmate size.

My saw would be make a tester first, find out what height suits you and then make one that you can adjust depending on what riding your doing. Similar to the Madstad that is make for many bikes, allows tilting of the angle and also sliding of the screen to allow a higher or lower screen.

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Plough on