The R5s had a tyre size of 135/70x13 or 145/70/x13 on the TS....
So a rim diameter of 13", Not sure how old the clio your talking about is, but i know the later 1.2s have 14" wheels with 175/65 tyres, the 1.6s have 15s and 2.0s have 16s.
Im unsure about the early clios.