ARC have introduced their new R8.1 2018 1/8th On-Road car kit. Option parts regularly used by ARC team drivers are now included in the R8.1 2018 kit. Aluminum front down stop arm, front anti-roll bar 2.4mm and 2.6mm and, 2.6mm and 2.8mm rear anti-roll bar are now a standard in the R8.1 2018. Different spur gear sizes and shock springs are also included for easier setup changes. Also included is the X-Hard Clutch Spring which was proven for its performance and durability in many races. The R8.1 2018 features a new front bulkhead with adjustable belt tension. Fine tuning of the belt tension between the front bulkhead and middle shaft base allows maximum transmission smoothness.