Hi everyone,

1. For box stock category, are we allowed to change the rear spoiler wings? e.g. Jomurema body with RTRC rear spoiler or Mclaren GT3 body with lexan rear spoiler.
2. Is there a technique to identify tire softness/ degree? i.e. I have a few pairs of PN tires (which I removed from purchased 2nd hand chassis). They are now mixed up in a bag and I don't know if they are soft, super-soft, mediums etc. so I can't pair them properly. I tried squeezing/stretching them and comparing them to the new tires that I have but I still can't make out what hardness they are (partially also because they are half-used). I don't want to throw the used ones away because they are still usable at 22.6mm.