Cybertronian Radial

Cybetron Radaial (or Radial Cybertron) is a brand of tire used by numerous transformers, most notably during their alternator upgrade where, while they were allowed to use licensed cars, they had to keep rolling with their Cybertron Radial original tires. Maybe they had a trademark issue ?...

Optimus Prime, on the other hand, had no problem switching for the Desert Dog Formula ones.

From Teletraan I: The Transformers Wiki, a Wikia wiki.