A sound casing can still be too old
Most casing advice is about damage: pull the tire before the tread is gone, repair punctures properly, keep pressures right. All of that matters. There is a second test a casing has to pass, and it catches fleets by surprise because it has nothing to do with how the tire was treated.
Rubber ages. The compounds in a tire change slowly over the years whether the tire is running or sitting, and a casing that is structurally perfect in every other way can be too old to be worth another tread. Retreaders commonly set age limits for the casings they will accept, and the casing inspection looks at age alongside condition.
That is where part-time units come in. A trailer used for a few weeks at harvest, a spare that rode under a truck for years, a seasonal grain truck: their tires can come off with good tread and sound structure, and still be past the point where a retread makes sense.
What it means in practice
Look at the date before you plan on a retread. Every tire's manufacture date is in the code on the sidewall: the last four digits are the week and the year. A quick look tells you whether a casing is young enough to be a candidate.
Send casings while they are young enough. A casing that comes off a daily unit is usually fine. One held in a corner of the shed for several years waiting for a batch may not be by the time it ships.
Ask the store about current age limits. They are set at the plant and can be confirmed when casings are collected.
Where the work happens
This store works with Purcell's retreading program. Casings are collected in Henderson, retreaded at a Purcell plant, the nearest being Potosi, Missouri or Cleveland, North Carolina, and returned ready to run.
Collecting stores nearby
Owensboro and Princeton also collect casings. A fleet account can record tire age alongside tread, which makes this easy to track: see fleet services. Worn wheels found when casings come off are wheel refurbishing, here.
About this store
The Henderson store carries all nine Purcell tire categories and is managed by Derrick Madewell.
See the national retreading page for how the program works and for all 54 collecting locations.