Tamiya Grasshopper with upgraded 540 motor and wide tires driven by my 7 years old. No problem ????

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The problem with upgrading to the 540 motor is that your Grasshopper would flip over lots. The best solution for me is to widen the rear wheel span. Having a wider tire width would definitely help as shown in this video.

The tire width is 50mm against 40mm stock. The hex adapter also pushes out by a good 5 to 6mm.