Why can't I call or possibly assign the Constructor in this code?

Question

I have it set to create and assign a new variable to my Constructor but i can't call what I assign remember _tires is protected and must be assigned through the Constructor.
https://code.sololearn.com/cvLRXSSI08MJ/?ref=app

Answer 1

https://code.sololearn.com/cQV9VnktryDj/?ref=app