Feedback's Velo Cache Expansion Kit upgrades your Velo Cache 2 Bike Column (sold separately) to a 4 Bike. The kit contains 2 pairs of cradle arms and an extended support leg, which allows hanging 2 additional bicycles on the back of a Velo Cache 2 Bike Column. The Expansion Kit widens the Velo Cache footprint to 32.5 x 34 inches. All hardware is included.
Also available in Silver (image unavailable from manufacturer).