haha I like questions like these. In theory, yes bigger wheels give you greater potential for top speed. In practice the bigger you go, the more mass, friction and circumference your wheels have needing greater power to get them up to speed and maintain it (Im really oversimplifying this btw). So in effect you diminish your cars acceleration by going for big wheels. However, assuming that you somehow bumped up your 172s output to say 300bhp with a similar increase in torque, then yes you could push the bigger wheels through the same final drive and attain a higher top speed. Problem is that the Clio is not the most aerodynamic of shapes and there will be a certain speed at which you hit a brick wall, needing a hell of a lot more power to keep accelerating.
On a standard valver I always found this to be around 120-125mph on the speedo, even though it is capable of 130 roughly. Likewise with my turbo valver running around 240-250bhp you can feel the brick wall effect at 145mph. On the autobahn of course.