Tires

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Tires are a Scrap Clicker 2 currency added in 6.0 (03/10/2018). They get unlocked with the first x130 stars tree upgrade.

After purchased, a Tire will drop every 60 seconds and bounces along the bottom of the screen. Tires can be used to purchase a new group of upgrades

Theories
There are many theories about what will the tires do in the future. Some common are that there'll be a feature to build cars with them and other currencies or a "Tireyard".

Trivia

 * Instead of going from 5.9 to 6.0 as expected, there were 5.10 and 5.11 between those two. The main reasons are Schrott Games taking a vacation and the time adding the tires.