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Cox Ultra Stock

Cox Ultra StockThe Cox Ultra Stock was an electric 1/10 scale RC car released in 1989. It featured a Toyota Supra off-road race body which competed in the Mickey Thompson Off-Road Championship stadium races of the era. It was powered by a Mabuchi 540 motor connected to a manual speed control. The Cox Ultra Stock was a radical looking car with its massive fenders, skinny front tires, wide knobby rear tires and replica Center Line wheels. However, reviews of the time said the car suffered from a poorly designed front suspension that made it little more than a backyard basher for the rookie RC car enthusiast. In the September 1989 issue, RC Car Action Magazine cited a problem with the front hinge pins and steering ballcups being excessively tight from the factory. Their solution was to wear in the ball cups with a dab of liquid rubbing compound. While replacement parts are very hard to find, an ebay seller going by the username “Team Bluegroove” is now offering replacement body shells for the Cox Ultra Stock that are said to match the original car’s specs.


  • Scale: 1/10
  • Release Date: 1989
  • Price (MSRP): $170
  • Price (Street): $150
  • Length: 17.2“
  • Width: 9.25”
  • Height: 6“
  • Wheelbase: 10.1”
  • Front Track: 7.1“
  • Rear Track: 7.75”
  • Weight: 3 lbs, 10 oz
  • Front Wheels: 2“ x 0.6”
  • Rear Wheels: 1.5“ x 1.3”
  • Motor: Mabuchi 540
  • Chassis: ABS tub
  • Front Suspension: A-arm
  • Rear Suspension: Trailing arm
  • Front Shocks: Coil over friction
  • Rear Shocks: Coil over friction
  • Differential: Gear
  • Tires: Rubber knobby
  • Wheels: One piece plastic
  • Bearings: Plastic bushings
  • Body: Clear polycarbonate


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