Hi, bought a Focus Cayo Triple from you with rear 105 cassette of 12-27 running on Concept hub (Order No 6204904292). I want to change cassette to this Tiagra 12-30 but am worried that it may not fit if my freehub is a 10 speed only. See Nickdos review 1 Oct 2012 who said "This also means if you have a "10 speed only" hub, this cassette wil not fit, you need a 8/9/10 speed hub." I am confused by this and not sure if my hub is 10 speed only. Any advice please, or if none, could I buy,try & return if it does not fit?