Search for a command to run...
The Red50 Tire was obtainable by reaching level 50 on the criminal team in OG Season 3. Alongside that you needed to buy it for 10k cash.
Red50 has started to become more accepted in trades as adds and often attracts the interest of collectors more frequently than the likes of Blue eyes, Jailbreak Army or Brickset Spoiler/Rim, hence the demand change.