Every ride starts with the puzzle phase of fitting bikes on the rack. Most racks force a specific order, especially with non-standard bike frames, but the Shifts&Grins adjusts to your setup so you spend less time swapping spots and more time riding.
Loading 4 bikes shouldn't be a puzzle. Most racks force a specific order, but the Shifts&Grins lets you load your way. Plans change? Drop to 2 bikes in seconds - just loosen the knob and slide off the add-on. No tools, no hassle, just ride.