I was checking out the specs of the new Trek Madone 6.9 Performance and noticed that it lists a SRAM 1070 11-26 cassette. The interesting thing is that for the 6.5 performance, they list a SRAM 1090 11-26 cassette. I would think that they would put the lighter new 1090 cassette on the high end bike. Does anyone know if this is true or is it just a typo on Treks part?