They are 1/5 scale tires. The stock Losi 6 tires were very good, but didn’t last. At $160 set it was almost two expensive to use the car. Owners got as little as a single run on them , most could get 3-5. Not race conditions, just running around. No other tires fit, Losi was aware of the issue but sales didn’t justify a fix. One owner made adaptors to use 1/5 wheels, soon as he started selling them we all followed. It never bothered me that the wheels were wider, some owners made custom wheel flares to cover them.