How cold does it have to be before the plastic gets brittle?
The fastest way around the track is on the track
It usually has to be around -10 to -20 degrees Celsius before it becomes brittle. Parts will break based on how hard you drive your truck
A well-known plastic parts manufacturer considers 50*F (10*C) to be outside normal operating conditions. I have experienced the brittleness of plastics at that temperature.
If you're gonna be stupid, you'd better be tough.