Do you want your Brompton to be more stable and easier to roll when folded? This MiniMod X-Roller extender is just what you need. The set comes with the MiniMod X-Roller extender and two MiniMod Easy wheels in matching color. The MiniMod EZ wheels are a little larger than the factory rollers which allows the bike to roll without the suspension block hitting the ground. This kit IS NOT compatible with P Line and T Line Bromptons. Notes: Do not load the bike over 66 pounds when the MiniMod X-Roller is extended. This will cause deformation or breakage of the MidiMod X-Roller extender. (This is designed for frame protection. The X-Roller will bend before the Brompton frame ends break). Do not extend the MiniMod X-Roller rod during transportation mode (eg. air travel). Do not drop your bike when the MiniMod X-Roller is extended. This will cause deformation or breakage of the extender. Weight: 75g Material: Aluminum alloy 7075 Installation video available here