Is it permissible to replace a damaged tire under warranty, knowing that the cause of the damage might be due to driving over a pothole or a speed bump unintentionally, without deliberate destruction?

The aforementioned warranty is a "performance warranty," under which the seller is obligated to repair or replace the item if a manufacturing defect is proven. This warranty is permissible in Islamic law, and there is a need for it because many defects in goods do not appear until after actual use.

As for the seller's claim that the defect is due to driving over potholes, it is a trick to evade the warranty obligation, especially since he did not stipulate this at the time of sale. Driving over potholes is not considered an offense against the car as long as the driving is normal. Therefore, you are entitled to have the tire replaced under warranty.