JHL is the manufacturing partner behind TrailMaster's newest generation of dirt bikes. TrailMaster introduced the line as an entirely new design developed with JHL, rather than a revision of the older numbered TM series. The range works as a ladder. It starts with the SK110 bikes: 107cc four-strokes on a 25-inch seat, offered in automatic, semi-automatic and Bosch fuel-injected versions for younger riders. The MK110-ES and the MK125 family step up to a larger front wheel and a four-speed gearbox, with Bosch EFI on the MK110-ES and MK125E. The SX125 and SX150 move into a full-size chassis with 124.3cc and 140cc air-cooled engines. The MX250 and MX250 Pro run 223cc and 249.9cc engines with five speeds and a 35.5-inch seat. At the top, the LX300 and LX300 Pro use a 283cc water-cooled EFI engine, and the LX250R is the racing model. Prices run from $829 to $5,999. Engine size, seat height, transmission and assembly level are listed on each product page, and shipping is calculated per model at checkout.