[tomglynch]

This is a similar problem to riding a fixed gear bike. When using skidding as a braking technique, specific areas of the tyre will wear faster unless you select a gear (front chainring and rear sprocket) combo with a large amount of skid patches. This is due to the rider always engaging in a skid with their crankset in a specific position - either left or right foot at 90 degrees, and the other at 270 degrees.

Here's a fun calculator for it: https://www.surplace.fr/ffgc/

Notice that a very common gear combo, 44/16 only gives 4 skid patches, so if you're after longer lasting tyres avoid this setup.