With regular racks, Ortlieb's QuickLock 3 and 3.1 panniers require the use of adapters that are delivered with these bags. This product, the Ortlieb Rack3, has Quicklock 3 and 3.1 adapters bolted on them right out of the boxon the other hand they are easy to take off when you need to use regular bags. For use with regular bags you can choose between the higher and lower horizontal bars: attaching your panniers on the lower bar enables the use of a basket or Trunk Bag on the top level. - Suits 26" and 28" wheel sizes - Made of aluminum - Max. cargo 30 kg = 66 lbs (one product image has a prototype with incorrect cargo data stamped on it) - Width of top level: 100 mm - Package contains mounting instructions and bolts for installing on bikes with braze-ons