Skill development

Consider a bicycle:

$($a$)$ Describe the kinds of PM actions to ensure that the bicycle is safe to ride and that the ride is satisfactory.

$($b$)$ Make a table to indicate the frequency of the various PM actions.

$($c$)$ List the PM actions for the tires.

$($d$)$ Which of these may be carried out by a lay person and which require a skilled mechanic?