The R18i carries a single-cylinder, liquid-cooled, SOHC mill displacing 174 cc with power claimed to be 18 hp at 9,500 rpm and 15.1 Nm of torque at 7,000 rpm, mated to a six-speed gearbox with chain final drive

For lighting, the R18i comes with a projector beam headlight, LED DRLs and tail lights as well as a full digital instrument panel. The monochrome display shows all the necessary information including speed, two odometers, battery level, tachometer, fuel gauge, clock and gear indicator.

the R18i follows the specifications of the RFS150i, with single brake discs, sized at 240 mm for the front and 220 mm for the rear. Suspension is done with non-adjustable upside-down forks, Kayaba monoshock adjustable for preload and 17-inch wheels shod in 80/80 rubber in front and a 120/70 tyre on the rear wheel.