SPX & X12 6.5?

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Just wanted some advice - I'm running a LRP Stock spec SPX with heatsink and a LRP X12 6.5T. I'll be using the LRP 5000mah 50C saddles too. I'm not too sure where to start with the gearing and profiles. I'm using the stock spur gear.

I'm looking at running at Taplow (indoor on carpet). Could anyone give me a starting point?

Also, I'm a bit unsure on what profile to use on the ESC. I've always used Tekin... what would you guys recommend?

Thanks