I have 3 Wilson racquets and all 3 recommend a tension of 50-60lbs. However, they all have different recommended tension ranges when displaying them in kilos. My 6.0 85 says 25-29kg(which converts to approx. 55-64lbs), my 6.0 Triad says 23-27kg(50.7-59.5lbs) and my Tour 90 says 22-27kg(48.5-59.5lbs). I wonder why all this is, and I wonder if new 6.0 Originals still recommend 25-29kg.