Renault Roof Racks

I purchased a Scenic for the wife last year, nice car, does the job of carting the kid around and no earache for me... sound.

Now I am a keen cyclist (a very fat one, but still keen), so off I went to Halfords to find a Roof mounted cycle carrier that would fit on the Renault supplied roof rack, well after trying 4 different brands, none of which will fitted the Renault roof rack, the poor guy shaking his head, he went off for some assistance. Upon returning I was informed that the Renault roof rack is massively oversized and that I will struggle to find anything that will fit them apart from Renault carriers. Now how much are the Renault carriers compare to the off the shelf, double the cost.....