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I also was surprised at how much air pressure my Speed Triple lost in a fairly short time.

I have been spoiled because my previous Triumph, a Sprint ST, had nitrogen in the tires. The advertised benefits are that nitrogen molecules are 4 times as large, and therefore leak much more slowly. In addition, for track day nuts, nitrogen does not change pressure nearly as much when the tires are hot. The cost is pretty minimal (if I recall we charge $13 for both tires) so it is worth a test. I have been meaning to have this done, and checking the pressures last week moved it higher up my "to do" list.
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