Affordable 4 Pole Motor and ESC Combo's for Short Course Vehicles from Viper RC

Viper RC has two affordable 4 pole motors and esc combos for short course vehicles.  The Viper VX4.39 4-Pole 3900kv 540 class brushless motor 3.17mm shaft with Copperhead ESC (part# 6VSVX43901) is designed for 2wd and 4wd short course vehicles under 6 pounds.  The Viper
VX4R.45 4-Pole 4500kv 550 class brushless motor 5.00mm shaft with Copperhead-R ESC (part#6VSVX4R451) is designed for 4wd short course vehicles over 6 pounds.