Yup 22 tooth comes in the box as mentioned. I run that with my 7.5 motor in mine. Never change it, was same with BMAX2. I only geared upto 26 tooth when using a 10.5, and a 30 tooth with a 13.5 or brushed saturn 20T.
There is also a gear chart in the manual, page 21. With the standard 80 tooth spur gear the car will take pinions 20 to 30.
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