Found one of those hot wheels kits for under $10 at Wal-Mart. Got home and found the rear axle didn't snap into my Atomic Toys Z-car...there's a little bit of plastic on the inside of the rim that would need to be trimmed to fit. Then I tried out the motor and it wasn't quite working. Upon further inspection it is just a smidgin smaller than my Z-Car motor. Anyways, just thought some people might find this info interesting. I was also wondering if anyone has tried the Hot Wheels Kit in the Microsizers and if it worked perfectly or not??
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Black Z-Car
3.0 Motor
6:1 Gearing
0-10' in 3.2 sec.