MR4 BX Help with motor & pinion etc

[gregnottage]

Hi Guys,

I've just purchased an MR4 BX from eBay and I'm after some advice on suitable spur gear & pinion setups.

I'm looking to buy an LRP 4.5 brushless motor with the Sphere Comp ESC. However, I'm unsure what I need to purchase in terms of spur gear & pinion to work with the LRP motor & ESC?

Please can you help me with what I need?

Also, do I need to worry about a fan & heatsync to keep the motor cool?

Thanks in advance for any help or advice you can share with me.

Kind Regards,

Greg.