Most tire makers say to retire a tire 10 years after it was made no matter how much tread is left, and to have it inspected every year once it passes 5 years. Several automakers have set a stricter 6-year limit. In South Florida heat and sun, plan on the earlier end of that window, especially for cars that sit and for spares.
Tread depth is how most drivers judge tires, and it is the wrong test for a car that does not rack up many miles. The rubber compounds in a tire contain oils and antioxidants that keep it flexible. Over time heat, ultraviolet light and ozone break those down from the outside in, and oxygen slowly works on the inner layers that bond the steel belts. The result is a tire that can have nearly new tread and still be structurally old.
No federal law sets a maximum tire age for passenger cars. What exists are manufacturer guidelines. Michelin's position, shared by several major tire makers since the mid 2000s, is an annual professional inspection after 5 years in service and replacement 10 years after the date of manufacture, spares included. Ford and what was then DaimlerChrysler published a stricter 6-year recommendation, and many owner's manuals still carry a 6-year advisory.
The clock starts when the tire is made, not when it is mounted. A tire can sit in a warehouse for a year or more before it reaches your car, which is why reading the date code matters.
Symptoms
- Fine cracks in the sidewall or between tread blocks, worse when the rubber is flexed
- The rubber feels hard and looks gray or faded rather than black
- Plenty of tread left but the car has noticeably less grip in rain
- The DOT date code shows a manufacture date more than 6 years ago
- A bulge, ripple or out-of-round spot on a tire that has sat for a long time
- The spare has never been used and the car is 8 or more years old
Likely causes and what they cost
1. Sidewall weather cracking
$120-$300 per tire installed for most cars and crossovers; $200-$450 for large SUV, truck and performance sizesOzone and UV exposure crack the outer rubber, starting as a fine web in the sidewall and the bottom of tread grooves. Shallow surface crazing is cosmetic at first, but cracks that open when you squeeze the sidewall, or that reach the cords, mean the tire's structure is compromised.
The fix: Replace any tire with cracks that open under flexing or that you can catch a fingernail in. Have borderline cases judged by a tire professional.
2. Age past the 10-year outer limit
$500-$1,200 for a set of four on a typical car installed with balancingLow-mileage cars, garage queens and seasonal vehicles routinely reach a decade on their original or second set of tires with plenty of tread. At that point the internal bond between rubber and steel belts has had a long time to degrade, even if the outside looks fine.
The fix: Replace the tire regardless of appearance. That includes the spare.
3. Six-plus years on a hot-climate, outdoor-parked car
$25-$50 for an inspection if not free; replacement as aboveHeat speeds up the chemical reactions that age rubber. A car parked outdoors in Florida spends much of the year with tires baking on pavement well above air temperature, which compresses the aging timeline compared with the same tire in a cooler climate.
The fix: Have tires past 6 years inspected annually, and replace at the first sign of cracking, hardening or a bulge rather than waiting for 10.
4. Tires that sat underinflated for months
free to inspect yourself; $120-$300 per tire if damagedA parked car's tires lose about 1 psi a month. Over a long summer away, a tire can sit for months well below spec, flexing the sidewall under a static load in the heat. That can cause internal damage that shows up later as a bulge or vibration.
The fix: Inflate and inspect before driving at speed. Replace any tire with a bulge, a ripple, or a vibration that does not go away after 20 miles.
5. Old stock sold as new
free to checkTires do not have an expiration date at sale, and slow-moving sizes can sit in inventory. A tire that is already two or three years old on installation day gives you less usable life before the age guidelines apply.
The fix: Check the DOT date code on each tire before it is mounted, and ask for newer stock if any tire is noticeably older than the others.
Costs are typical South Florida ranges for parts and labor, for budgeting only.
What you can check yourself
- 1Find the DOT code on each tire
Look on the sidewall for the letters DOT followed by a string of characters. The full code may be on only one side, often the inner side, so you may need to turn the wheel or check the other face when it is rotated.
- 2Read the last four digits
The final four digits are the week and year of manufacture. 2219 means the 22nd week of 2019. A code with only three digits was made before 2000 and is long past any age guideline.
- 3Check the spare too
Pull up the trunk floor, or lower the underbody spare with the tool in the jack kit, and read its date. Spares are often the original tire from the factory. Wear gloves and keep hands clear when lowering an underbody spare on its cable.
- 4Flex and inspect the sidewalls
With the car parked, squeeze or press on the sidewall with your thumbs and look for cracks that open. Look in the bottom of the tread grooves for crazing too. A gray, chalky surface is a sign of UV exposure.
- 5Look for bulges and ripples
Sight along each sidewall in good light. A bump or wave in the rubber means internal cord damage, and the tire should not be driven at speed.
When to take it to a shop
- Any tire, including the spare, is 10 years old or more
- A tire is 6 years old or older and shows any cracking or hardening
- You see a bulge or ripple anywhere on the tire
- The car has sat for several months and has a new vibration after driving
- You are buying a used car and the tires are older than the car's last few service records suggest
The Florida factor
Ultraviolet exposure in South Florida is high for most of the year, and a dark sidewall facing the afternoon sun in an open parking lot gets far hotter than the air. Cars parked outside in Boca, Delray and Boynton show sidewall crazing years earlier than the same tire kept in a garage. If you park outside, a tire dressing that is water-based and UV-protective, used sparingly, is preferable to glossy silicone sprays that can dry rubber out over time.
Seasonal residents are the classic case of old tires with deep tread. A car driven 3,000 miles a year may never wear out a set, and the tires quietly age past the guideline while the tread looks new. Read the date codes every fall when the car comes out of storage.
Boat and utility trailers are common here and their tires age even faster, since they sit loaded in the sun between trips. A trailer blowout on I-95 on the way to the ramp is often a tire with half its tread left. The same 6 to 10 year logic applies, and many trailer owners replace on a shorter cycle.
Notes for specific makes
- Ford: Ford has publicly advised replacing tires after 6 years regardless of tread, and many Ford owner's manuals include that guidance. Check your manual for the exact wording on your model year.
- Mercedes-Benz: Mercedes-Benz was among the first automakers to recommend a 6-year limit. Low-mileage Mercedes and other luxury cars that sit often reach that age with very little tread wear.
- Jeep: Wranglers carry a full-size spare on the tailgate, exposed to sun every day and often never rotated into use. On an older Wrangler that spare can be badly sun-checked while the road tires are fine. Include it in rotations or replace it on the same age schedule.
- Toyota: 4Runner, Tacoma and Sequoia trucks often carry an underbody full-size spare that is never used. Read its date code when you buy road tires; on a 10-year-old truck it is likely the factory original.
Tires & Wheels shops near Boca Raton
- Amway Tire Center Inc.1750 South Dixie Highway, Pompano Beach, FL, 33060
- Discount Tire125 State Road 7, Coconut Creek, FL
- Jones Tires1361 Southwest 1st Way, Deerfield Beach, FL, 33441
- The Tire Choice22923 Sandalfoot Plaza Drive, Boca Raton, FL, 33428
- The Tire ChoiceParkland, FL
- Tire ChoiceDelray Beach, FL
Frequently asked questions
Is there a law in Florida about how old tires can be?
No Florida law sets an age limit for passenger car tires. The limits that exist are manufacturer recommendations, typically 6 years from automakers and 10 years as an outer limit from tire makers.
How old can a new tire be when I buy it?
There is no official rule, and a tire that sat a year in a warehouse is generally fine. Check the DOT dates before mounting, and ask for fresher stock if a tire is several years old or the set has mismatched dates.
Does storing tires indoors stop aging?
It slows it. Cool, dark, dry storage away from electric motors, which produce ozone, is best. The rubber still oxidizes slowly, so the 10-year limit still applies.
My tires have 7/32 of tread but are 8 years old. Do I need new ones?
Not automatically, but they are past the 6-year mark and due for a careful inspection. In Florida heat, with any visible cracking, replacing them is the safer choice, especially if you drive at highway speeds regularly.
Related guides
More on this job: Tires & Wheels in Boca Raton, costs and how to choose a shop
- Michelin: When to Replace Tires, Wear, Age and Safety Signs
- Michelin: How to Read Tire Markings and Sidewall Codes
- Tyrepress: Michelin North America and Continental recommend tyre age limit
General information, not a diagnosis. A car problem can have causes a guide cannot see, so have anything safety-related inspected in person. Read our editorial policy.