Since I wanted to spend a fortune for a bike rack, it should be the MAC Winny 2. Big Mistake !! Upon delivery of the package was damaged and bent a bracket. A lamp was broken and the same carrier could not be fixed on the ball head. Help for this problem did not exist in the manual and a set screw on the bracket, I could not discover. The terminals for the bicycles are a joke. The rubber in the holding jaws to lose determined for the first 100km. In a nutshell, I was not enthusiastic about the implementation and the quality. But no problem, carrier disassembled and returned to seller. Stupid was that Amazon was not the seller, so we had to wait for a refund weeks. This was only acquired by Amazon, after we have notified the seller, who pretended to be dead on Amazon. Conclusion: Bike rack scrap Delivery and customer service in case of problems with the seller Amazon top !!