The TreeFrog PRO 3 model can carry up to three bicycles (maximum load is 60kg) or two electric bikes. Double-layer polycarbonate board Pro 3 features 5 TreeFrog vacuum cups with a load capacity of 110 kg for each of them, 3 fork mounts and 3 rear wheel mounts. The 9-15x100 mm universal fork mounts can safely hold either 3 standard 9 mm quick releases or 15x100 mm forks (Boost spacer works with 15x110 mm mountain bikes). Different axle for mount sizes are available for the Pro range - 12 mm, 15 mm, or 20 mm (including one for the Lefty fork). This is great choice for families with kids and for all cars.