By The Way, I dropped micro fiber cloths on the rack frame holders, because the rubber was breaking down, and it would smear onto the paint and frame. My Saris trunk rack was 10+ years old though However the wind force as I was driving Freeway at 70 would definitely swing the bottom of the bike out away from the car. that didn't help the rubber holder things any.
29er x2.35 catch a a lot of wind, as do deeper dish wheels. a 29er tube worked great for tying it back.

my straps were deff on the dry rot side & crusty from using it in the winter months, and the frame was rusty.... I was pushing my luck. Saris makes a great product.