Zero S Electric Motorcycle - Specs || ZERO MOTORCYCLES
For the '15 models at least, the zero sr is geared higher (top speed 102mph, 85 sustained) than the zero s (top speed 95mph, 80 sustained). When equipped with the same battery capacity, they claim the same range for either model for city, 55mph or 70mph
Also, with their belt drive, there may not be a third option avalible anywhere for higher gearing