The 2013 METROFIETS standard is the latest iteration of the long john form we have been producing for five years. We use 4130 for all of our builds. All of our bikes are modern "go fast" cargo machines with nod to the classic styling of bicycles from the 1930′s & 40′s. Belt drive and electric assist ready the METROFIETS standard is ready to haul your gear around the block or on that road trip you plan taking this year. See more at http://www.metrofiets.com