Another great product from Thule, the Thule BSTK2 Bike Stacker will provide a secure system of stacking two bikes and saves a lot of space. It's a neat, balanced mounting for most every type of bike. The one by two inch steel tubing construction is plenty strong even for heavy bikes. Independent adjustment arms allow you to choose the level and the height of the resting bike. V-shaped soft rubber bike holders will not mar paint or crush cables, these cradles can also be moved front to back to position or overlap the bikes if needed. Adjustable feet level the stand on uneven floors, and will rests evenly on carpet. 10mm wrench or an adjustable wrench is required to assemble this unit, not included.