I've got this set-up for my Ford Kuga, 'Mont Blanc' Roof Bars and 'Mont Blanc Barracuda' Cycle carriers, now i am a firm believer in spending a little bit more will get you a better product, especially in this field. You do not want to be leaving your beloved Retrobike bouncing down the Motorway. The positives on my set-up;
1 - Bars and Carriers lock to roof bars on car (Great Anti-Theft mechanism lockable with key)
2 - Cycles are locked into fixings again secured by a special security key, so when fitted to carrier cannot be removed easily.
3 - Mont Blanc is good quality, well built and the version i have has a nice deep scoop for the front wheel to sit in which will accommodate up to 2.2 tyres.
CRC has them for sale, free postage single carrier £85 they do double packs of carriers £152.99
I use mine a lot and never feel that they are unsafe when motorway driving. \the bike always feels secure and safe and the anti theft measures that are built in are a godsend, especially if you have to stop en-route.
"Would anyone else rather be doing something other than marching up and down the square????"