The rear tires lasted most of the year, but eventually wore down enough to become front tires.  Nylon straps have done the best of any material on the front tires, despite the problems getting them on.  The nylon has all come from an old camera bag which the lion kingdom twice ran 32 miles with.  Old lions wouldn't do such a thing, because there are lighter solutions.

Getting them on has best been done by tacking on a quarter of the strap at a time with high airflow.  The high airflow sets it quickly.  Then do a 2nd pass sealing the gaps.  It still needs 24 hours to  cure.

After 2 months, the $60 brushless servo died & it went into the street.  The death was intermittent, as it briefly came on again.  Back on the bench, it managed to still have a fault.  All the voltages were normal, with no voltage going to the MOSFET gates.  Power cycling it a few times in the street didn't bring it back, but it did come back after a power cycle on the bench.  Nothing that suffered mechanical wear seemed to be worn out.  It was a microcontroller that had become flaky.

It's a Silicon Labs F330, 8051 core.   Dave would check all the pins & try to fix it.

After all the servos, there's a real need to build a servo from scratch to last forever.  The $60 one has enough useful parts to work again with a custom board, but this would be a significant investment in a rare time when the lion kingdom's time is actually worth more than a servo.

Expensive, high performance servos have consistently died much faster than cheap servos.  The longest lasting might be the Tower Hobby brand from 20 years ago.  Futabas are in the middle.  Servos might have too many moving parts, moving too fast, in too little space.