You've got the spoke rims on your 08 Aero which need tubes. I don't know if running tubes in a radial tires is an issue or not, but I think that is why most tires for this bike are bias ply. You can run a 170/80 on the rear with no problem. You could go with a different brand tire. OEMs are to keep costs down and are not the best tire IMHO, unless for some reason you are dead set on getting the Bridgestones.
2008 Aero 750