Ok What size is the shaft on the 8 XL. Also what gear should I get. Want one to run all day on 6000 ION cells and 1 for racing at the track (long track)?

I was going to get the wander 10L for run times but they are not in stock.
I suppose the 8XL is fine but I think it will have to much power and be breaking stuff all the time.

O yea I will be running 5s 6000 MAH Lithium ions that metal man found.