Old thread but I have some pics for anyone trying to get a roof mounted set up. I went with the
Whispbar S25 flush bars with the 733 fitting kit. This was £195 excluding delivery from from roofbox.co.uk. The roof bars themselves are great, 75kg weight capacity. The have the flush mount ends so they look very clean, almost OEM clean. Its a real shame the Leon doesn't have bolt points on the roof to save using the ugly clamp system. They are aerofoil shaped so they claim to be the quietest roof bars on the market and I can confirm they don't whistle or make much wind noise. The only issue is with the Seat clamp system, this naturally creates a slight gap in the doors seal and this is where the majority of added wind noise comes from. The radio will cover the noise but it is there. The mounting kit is a soft rubber foot that sits on the edge of the roof. I cant see it causing damage as long as the surfaces are cleaned before fitting and regularly maintained every month or so with a quick wipe. An option is to clear wrap the roof under the feet which I plan to do once its dry outside.
The bars are relatively easy to fit. Just adjust the bars width and fit the clamp fitting kit provided which is specially made for the Leon 5F 2012+. I can confirm that the sunroof tilt function will work for the flush bars but the slide back DOES NOT! It will make contact with the bars and possibly damage your sunroof so be careful. The flush end bars offer the added bonus of looking better but they do reduce the usable space of the bars themselves. I'll never be carrying more than 1 bike so it doesn't bother me but if you are carrying a box and bikes or multiple items the through bar setup would be better but this is personal preference. The bars themselves are interchangeable so you can reuse the clamping mechanism and just swap out the bars between flush and through if you want. If you change your car down the line you can also change just the fitting kit and swap the bars onto your new car for only about £30 which is handy. Here's some pics for reference on a Cupra
290.
I paired the bars with a Thule ProRide 598, basically one of the best bike racks on the market. It mounts to the Whispbars with 20mm T track fasteners. There come provided with the Thule rack. Plenty of info can be found about this bike rack online. So thats my bike fitting setup. Hopefully it helps someone on the fence like I was. Any questions please ask away and I'll
help where I can.