Coming from ARC is the R8.1 2018 1/8th nitro on-road kit. The ’18 variant sports a couple of changes such as an updated front bulkhead that incorporates a belt tensioner to adjust the belt tension between the front bulkhead and middle layshaft for improved efficiency. Also new are several tuning parts that were optionals previously such as aluminium front downstop arms, 2.4mm and 2.6mm front as well as 2.6mm and 2.8mm rear anti-roll bar wires and also different-size 1st and 2nd gear spur gears. The package is rounded out by new shock springs and an X-hard clutch spring.