the suzuki ts series is a family of two-stroke, dual-sport motorcycles made by suzuki since 1969. the series was the first suzuki trail bikes sold on the mass market. most of the ts line had an air-cooled engine and most models were introduced alongside the closely related tm (motocross) or tc (trail) models, tf (farm) and also the ds (for dirt sport, which had no turn signals, and simplified lighting) which in most cases shared engine and chassis designs. suzuki's first mass market motocross bike, the tm400 cyclone, was introduced in 1971 and was based on the ts that first sold in 1969. a ts185er model was available in a few countries.