hello everyone.

i need to buy a really light bike (like around 7kg) that's easy for handling (like easy removing of wheels for putting in a car).
i currently ride a KTM city bike for a few miles almost everyday.I can manage some 30km of riding (didn't try more) on that bike, but it is quite heavy and I bought it too small for my height so it can fit in an elevator.
i'm 174cm high and have around 65kg. i would like to buy a good bike which i can bring with me on a trip in a car an maybe later do some more cycling with it. I really like bikes that guys ride in Tour the France but don't know if that sort of professional bikes are appropriate for other things other than tour racing.
i know that bikes are expensive but i would like to invest in a good bike.
do you have some suggestions? I like Cervelo bikes but don't know if women can ride them. Maybe Focus?

i would appreciate some advice and sorry if my english is not the best.

Nina