The SeaSucker Mini - Bomber Two Bike Rack will add some innovation to your next ride. The rack has four different vacuum cups up front with a rated pull strength of 210 pounds each. These vacuum cups will hold your bike securely on top of your vehicle on any non-porous material. This bike carrier only weighs twelve pounds - so it will easily fit into your suitcase when you travel to your biking adventure. This is a fork mounted carrier, and comes with two Huske Universal Fork Mount. If you are looking for specific axle sizes, consider ordering the MAX version which includes the 9 x 100 w/ skewer, 12 x 100, 15 x 100, ans 15 x 110. There are two additional vacuum cups for the rear wheels. If you are using the carrier for two bikes the fork mounts can be moved to different positions so they do not bang against each other for transport. If you are using this to carry a heavier single bike, a single fork mount can be relocated to the center. The axle adaptors snap right into the base that comes with the rack. It is easy & quick to install and to take off. If you use a variety of vehicles when you travel, check out the SeaSucker Mini - Bomber Two Bike Rack!