2001-SRN
2001-SRNB
2001-AC
2001-DC
The SRN model is the base model; the AC and DC models represent the power intake each require. The SRNB requires less maintenance by removing the belt in the motor and replacing it with a more orthodox motor instead of a belt-driven one. Another model is the 2001-130, which is identical to a SRNB but is slightly taller. For the first 2 years of production, the 2001-DCs were sold as Roundbacks.2001-DC Roundback