A motorcycle tire has to do a lot of things a car tire could
never do. Lean over on it's sidewall, provide nearly 100%
traction at all times with just the right amount of slippage,
act as a damper for chassis instabilities, absorb a tremendous
amount of rotational torque, the requirements go on and on.
Motorcycle tires have come so far so fast in the last 25 years
that consumers (us) are still in the process of subsidizing
the development costs. The good news is that prices for the
latest tires have stabilized somewhat.
The typical shelf life for an installed motorcycle tire is
about three years. After that time period the rubber has hardened
(or cured) enough to deliver only HALF the traction from when
new. With this knowledge you are able to tailor the type of
tire to your riding mileage. In other words, don't buy a long
distance tire when you only ride 2-3000 miles a year.
Get a good tire gauge and use it. Cycle tires hold a fairly
small volume of air, so they need to be checked much more
often than car tires.
If you get a puncture in a tubeless tire that has less than
one/half of it's original tread left, there is no reason to
give much thought about what to do. It needs to be replaced
Rubber cracking on the sidewall indicates either chemical
damage or age, as in old. As the rubber continues to cure
after being made, it shrinks. Cracking=hardness=painfully
poor traction. Please replace them for safety's sake.