The TreeFrog ELITE 2 model can carry up to two bicycles (maximum load is 22 kg). The double-layer polycarbonate board features 4 TreeFrog vacuum cups with an individual load capacity of 110 kg, 2 fork mounts and 2 rear wheel mounts with velcro straps. The Elite 2 rack is recommended for road, gravel, triathlon, cyclocross bikes. Do not use it with electric bicycles or mountain bikes! The universal fork mount can safely hold either one standard 9 mm quick release or a 15x100 mm fork(Boost spacer works with 15x110 mm mountain bikes) - no need to switch out fork mounts. It is also available with 12x100mm thru axle fork mounts, for road/triathlon disc brake bikes. It is not available with 15x110mm or 20x110mm thru axle and Lefty fork mounts. It is a perfect choice for couples with a small car or anyone who likes to carpool when travelling for rides or races.