Nethercutt (Rokon) Pre-production Trail-Breakers
- Likely the first bike built by Charlie Fehn and used as the example for the patent drawings.
- Originally called "Trailmaker"
These pictures are commonly referred to as "The Maico Bike"
The pre-production MK1
- the angled air filter
- primary cover does not have the expanded metal center found on the production MK1
The standardized production MK1
- MK1 and earlier were "Trailbreaker", MK2 and later "Trail-Breaker"