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ZZ tires fit, but not real well. The rims are more like Bit rims and the inside edge is slightly higher than the outside edge. Zips have even edges on each side of the middle hump that the tire rests on. This makes the ZZ tires flare up on the inside slightly. Not a perfect fit, but the cars still fly with the grippier tires. Bit tires should do better on the back. ZZ tires won't go on the front at all. Bits may work there too. I'm using stock tires on the front. No, I haven't swapped motors, but they are exactly the same and interchangeable with Zip motors. I tried to give the info I thought interesting in my review. Was there a specific question you had?
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