Tyres are a CRITICAL safety item - they are the ONLY thing preventing you from hurtling into a crash-barrier, flying off an embankment or cliff, or crashing into another vehicle, when called upon, on a regular basis, to propel, brake or steer your vehicle, for years on end without fail.
It is the primary part on your vehicle that you MOST DEFINITELY do NOT want to compromise on - unless you have a death wish & have lost all interest in living anymore... (or drive a Renault Kwid, Datsun Go or Nissan 'Softbody' bakkie, in which case your fate has already been sealed in any accident or collision at speeds over 64 km/h...)