each dnano is a scale model of its full size counterpart so... modifying wheel diameters modifies ride height. this basically ruins the handling as the "real" car is not designed to run this way. the only types of cars where you can make that wheel diameter size change are those that have identical sizes on front and rear (ex: Nissan Skyline R34, Subaru Impreza WRC 2006, Lancia Delta HF Integrale)
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those are a perfect fit for the Subaru... i'd definitely push up the wheel diameter if possible as it increases wheel travel in turn, increasing overall speed.
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