A Excellent Upgrade .This is a 775 armature in a 555 case with Rare Earth (Neodymium) Magnets 5mm shaft . Balanced Armature , two 540 Bolt Patterns .11.1v to 24v This Motor works well in 1/10 Scale Cars and Trucks . 11.1v to 24v For 1/8 Scale Truggy , Buggy . Extremely High Torque . (20,000 rpm @ 24v) (10,000 rpm @ 12v) , 600 Watts (Traxxas 775 , 370 Grams) , (Whiplash 775 , 250 Grams) A savings of 120 Grams . Needs Brushed Speed Control . 9 inch #12 leads . TWO BALL BEARINGS