‘Sieben’ is a build of the Rogue Builds workshop from the US. The moped was commissioned by Chris Spealler – a CrossFit superstar (you probably know him if you follow this kind of stuff). In many aspects the building process was rather an interesting challenge for Austin Tremellen – the owner of Rogue Builds. To realize the ideas he and Chris had in mind for this build, Austin not only had to change and rework a lot, but also think out of the box and give the bike some amazing, even exotic (as he said) new features.
Although Chris didn’t give many instructions on how ‘Sieben’ should look and function at the end, there were several crucial wishes. He was planning to ride this Magnum with his wife, so the rear had to be appropriately rebuilt (swing arm, suspension etc.) for the second passenger to sit without fear of falling down. Obviously, a nice 2 pass. seat also had to be mounted for that same purpose. The seat you see on the moped is one of Ian Halcott’s (TwinLine) handmade items.
Austin got Zundapp tank from the Netherlands, constructed an ocular headlight using lens and outfitted the wheel with 2.5″ (front) and 3″ (rear) Heidenau tires. He also took care of the brakes and sealed-bearing hubs to improve handling.
Single speed engine was out of the question, as Chis used to own a moped before and really enjoyed shifting gears. The ZA50 two-speed engine was the one that Austin chose. After some significant performance improvements the moped is now able to go up to 55mph.