This is the Thunder Power 4.5 Turn Z3R-550 Modified Sensored Brushless 550 Motor. Z3R 550 4x4 Modified Motors are ROAR approved, and were designed to deliver incredible performance in 1/10th scale 4wd short course trucks. The Z3R 550 4x4 motors were designed by racers and engineered for performance and reliability and allow the use of optional rotors and stators to achieve desired race level performance.
Adjustable Timing: 0-50°
Weight: 8.7oz (247g)
Motor Diameter: 1.41" (35.7mm)
Motor Length: 2.57" (65.3mm)
Shaft Diameter: 0.200" (5mm)
This product was added to our catalog on Friday, June 15, 2012.
Let me just say that the 1st time I put my SC10 4x4 Factory Team on the track with this motor wired up to a Tekin RX8 (used Hotwire for mapping), I couldnt say anything, SHOCKED! I have ran the Novak 4.5, Tekin 4.5, and Viper 4.5, this motor has WAY more torque and top speed, just too bad its not ROAR legal. If you are just a club racer and don't do any ROAR events, buy this motor, you WILL NOT be disappointed! I was running the stock spur with a 14t pinion, kit set-up, Thunder Power 65c saddles, 30* motor timming, and it would pull the front wheels up out of every corner. Temps after an 8 minute Main were right around the 140* range and I live in Arizona.
I don't own one but just a heads up it is ROAR approved. http://www.roarracing.org/?page_id=251