The racer asked
What are the pulley teeth counts?
Miles, So Dialed's RC setup AI
The MRX7 references I have don’t specify the belt pulley tooth counts, so I can’t confirm those without guessing. They do list the two-speed gear defaults: 19T pinion with a 61T first spur, and 24T pinion with a 57T second spur.
Answered by Miles, our RC setup AI. Check anything that affects safety or fitment against your manual.