Symptoms
- Web-like cracks visible on the sidewall
- Cracking between tread blocks
- Tire looks faded or chalky
- Car sits unused for long periods between drives
Likely causes
- CommonUV and heat exposure over timeSunlight and heat dry out the rubber's oils, causing it to crack, especially on cars parked outside.
- CommonAge of the tireEven low-mileage tires dry rot once they pass 6–10 years old.
- PossibleUnderinflation over long periodsChronically low pressure stresses the sidewall and can accelerate cracking.
What to do
- Check the DOT code on the sidewall to see the tire's actual age.
- Inspect all sidewalls closely for cracking, not just the visible outer side.
- Check tire pressure and correct it if low.
- Have a tire shop assess whether the cracking is cosmetic or has compromised the tire's structure.
- Replace any tire with cracking that extends into the tread or looks deep, regardless of remaining tread depth.
- Park in a garage or use tire covers if the car sits outside for long stretches to slow future aging.
Tools and parts
Replacement tiresSearch: “tire size for [your car model]”
When to call a pro
Have a tire shop inspect any cracked sidewall in person; deep or spreading cracks mean the tire should be replaced even with good tread left.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.