I may have missed it but what type of riding will you be doing? Steep long descents? Racing climbs where every gram counts? The 160/140 sounds okay with me but if you can fit 160/160 it might be better... just in case you drop your bike and somehow bend only your front rotor. Then you can swap them out and ride with just a front brake to get home... That is if you're using 6 bolt and not centerlock.