InStep / Schwinn Bike Trailer Coupler Attachment Attach your InStep or Schwinn bicycle trailer to almost any bike with this coupler attachment. With an additional coupler attachment, both Mom's and Dad's bikes can be outfitted to tow the kids at a moment's notice. Bring the little ones along for family bonding time during your workouts, while demonstrating how fun a fit lifestyle can be. The quick and easy connection to your bike trailer lets you hit the road in no time. This bike trailer coupler attachment requires assembly and installation and comes with a 1 year limited warranty.