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I have that rack (but, never mounted it on my Z, and never the drove the car where I had it mounted on the freeway ). It is not attached to the car, but instead depends upon its weight (and the bicycle's weight) to hold it in place. The "bars" extending to the top of the rear hatch are actually straps with end clips that go over the top of the hatch. The rest of it (riding on the rear) is rigid, but there are no fasteners on the endpieces. It just sits there. You can see the liability of this arrangement. A panic stop throws the bike over the roof and hood (lots of deep scratches and a few dents), not to mention ruining the bike and the driver's liability throwing (or just losing) the bike in traffic. I'm surprised this thing is legal.
That is certainly an arguable point. I give this guy or gal some credit. This person wanted to transport a bicycle, but did not want to do any type of permanent mounting on the Z. So the solution was a temporary mount that goes on or off in 30 seconds. The problem is that it can "come apart" very quickly at highway speed, and place surrounding vehicles in harm's way.
Well...if he has a nice road bike, he'll add like..12 pounds of down force...cantilevered out there
No... it's more like 1.5 x's that weight. The value of a 12-15 lb. bicycle warrants a huge and heavy wheel lock (so... add another 5 to 7 pounds).
I find it interesting and peculiar that people who ride very light bicycles feel the need to take expensive and heavy locks with them to protect the bike when it unattended. ...Sort of defeats the "purpose" of owning a very lightweight bicycle.