XRAY - Model racing cars

Can you guys tell me when which tire combination is best suited for which track condition, e.g. low traction, technical or wide open high traction :

1. 40F and 38 Rear

2. 38F and 40 Rear

And what is the min/max caster for the car and how many degrees does each .5mm clip equal?

Thanks,

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The choice is something which will be going to get the overall work which may be going to get the better part to manage it in such part which will be going to proceed it for the best way.