When to replace tires - depth, age, and cost
Replace your tires when tread depth drops to 4/32" for wet-weather safety, when the tire turns 6-10 years old regardless of tread, or when you see cracking, bulges, or uneven wear patterns. The legal minimum is 2/32". Consumer Reports testing shows you lose 87 feet of wet stopping distance from 60 mph between 4/32" and 2/32", which is the difference between stopping in time and not. Most drivers know the penny test. Far fewer know that the rubber compounds in a tire oxidize whether you drive it or park it, which is why a 2012 NHTSA study tied aged tires with good tread to fatal highway crashes.
This guide covers all three replacement triggers: tread depth (with a chart), age (with how to read the DOT date code), and visual signs you can check in your driveway.
The Three Replacement Triggers
Tires reach the end of their service life in three independent ways, and you only need to hit one. Tread can wear down to 4/32" in three years of city driving, or you can hit 10 years on the original Michelin Defender T+H tires that came with your garaged 2016 Civic with 6/32" still on them, and both tires are done. The third trigger is physical damage: sidewall bulges, cracks deeper than 1/16", chunks of tread missing, or visible internal cord. Any one of these conditions means replace, even if the other two metrics look fine.
The 4/32" rule is the practical replacement point. Legal minimum is 2/32" in all 50 states, but Consumer Reports, Tire Rack, and AAA all set 4/32" as the safety threshold because wet-weather grip falls off a cliff below that. At 2/32" your tires pass state inspection but stop 87 feet longer from 60 mph on wet pavement than fresh tires, about six car lengths. On a tire that started at 10/32" and lasts 60,000 miles, you've used 75% of its service life at 4/32". Budget for replacement when you hit 4/32", not when you hit the wear bars at 2/32".
Tread Depth: How to Check It Right
Tread depth is the most common replacement trigger, and you can measure it three ways: a $5 tread depth gauge (the most accurate), the penny test (free, tells you if you're past 2/32"), and the quarter test (free, tells you if you're at 4/32"). New passenger tires start at 10/32" or 11/32"; light truck and SUV tires start at 12/32" to 13/32". Federal law requires built-in wear bars, raised rubber blocks across the grooves that become flush with the tread surface at 2/32". When you can see the wear bars across the tire, you are legally bald and stopping distances on wet roads are roughly double a fresh tire.
The Penny Test (and Why the Quarter Test Is Better)
Use the quarter test, not the penny test. If you can see the top of Washington's head, you're at 4/32", the recommended replacement point. The penny test only catches 2/32", which is already dangerously bald.
Insert a penny into the tread groove with Lincoln's head pointing down. If you can see the top of Lincoln's head, the groove is 2/32" or shallower, so replace immediately. The quarter test uses the same setup with George Washington's head pointing down: if you can see the top of Washington's head, you're at 4/32" or shallower, which is the recommended replacement point. The quarter test catches you with about 25% of useful tread remaining, giving you time to shop instead of buying the first set the shop has in stock.
Using a Tread Depth Gauge
A digital tread depth gauge ($8-$20 — the Wagan EL2270 or Custom Accessories 26580 are reliable picks) gives you a number rather than a yes/no. Press the probe into the groove until the gauge base sits flat on the tread surface, then read the depth. Check three points per tire: outer edge, center, and inner edge. If outer and inner differ by more than 2/32", you have an alignment issue. See our wheel alignment guide for what to do.
Tread Depth Reference Chart
| Tread Depth | Status | What to Do |
|---|---|---|
| 10/32" – 11/32" | New tire | Drive normally |
| 6/32" – 9/32" | Healthy | Continue regular rotations every 5,000-7,500 miles |
| 5/32" | Borderline winter performance | Start budgeting for replacement |
| 4/32" | Replacement recommended | Replace before next rainy season |
| 3/32" | Severely degraded wet grip | Replace now |
| 2/32" | Legal minimum (illegal at less) | Replace immediately — fails state inspection |
| Below 2/32" | Bald | Do not drive on highway |
Tire Age: The DOT Date Code
A tire that looks new can still be dangerous if it's old. Rubber compounds contain antioxidants and antiozonants that protect against UV exposure and atmospheric ozone, but those additives migrate to the surface and deplete over 6-10 years whether the tire is rolling or sitting in a garage. The result is internal belt separation, where the steel belts under the tread delaminate from the rubber, without visible external warning, until the tread peels off at highway speed. Michelin, Continental, and Bridgestone all set a 10-year hard limit. Germany, Austria, and the Netherlands set 6 years for the spare tire.
How to Read the DOT Date Code
Every tire sold in the US carries a DOT serial number molded into one sidewall. The last four digits of that code are the date of manufacture. The first two digits are the week (01-52) and the last two are the year.
- "2321" = week 23 of 2021 (early June 2021)
- "0524" = week 5 of 2024 (early February 2024)
- "4519" = week 45 of 2019 (early November 2019)
The full DOT code starts with "DOT" followed by 8-13 characters that identify the plant, tire size, and manufacturer's code. The 4-digit date is always at the end. One catch: federal regulations only require the full date code on one sidewall of the tire. If you look at the side facing out and see only a partial DOT code, check the inside-facing sidewall.
Tires made before 2000 used a 3-digit date code and must be replaced regardless of appearance. A 3-digit code (e.g., "239" = week 23, year ending in 9) means the tire is at least 26 years old. The rubber has been oxidizing for over two decades. This is most commonly found on travel trailers, motorhomes, classic cars, and spare tires that were never used. The 4-digit code became mandatory in January 2000.
Worked Example: Reading Your Tires
A 2020 Honda CR-V with original Continental CrossContact LX Sport tires:
- Walk around the vehicle and find the DOT code on each sidewall. On a CR-V, the outward-facing sidewall is typically the one with the date.
- The CR-V left-front tire reads:
DOT B95Y HYRR 4719. The last 4 digits,4719, translate to week 47 of 2019, or mid-November 2019. - Today is June 2026. That tire is 6 years and 7 months old.
- Tread depth measures 5/32" — still above the 4/32" replacement point.
- Decision: The tire has another year of service before hitting the 7-year mark most safety experts cite as a check-it-yearly point, and 3 more years before the 10-year hard limit. Plan a replacement for next spring; do not buy a new set yet. But if you also measured cracks in the sidewall, replace now.
Visual Warning Signs to Replace Now
Not all tire failures wait for tread to wear down. If you see any of the conditions below during a routine pressure check or rotation, replace the tire, since these are not "watch and wait" issues. The cost of a $180 tire is far less than a blowout at 70 mph or a roadside service call.
Sidewall Cracking ("Weather Checking")
Small spider-web cracks in the sidewall mean the rubber's UV protection has depleted. If you can fit a fingernail into a crack, the damage extends into the carcass plies and the tire should be replaced. Light surface checking on a 4-year-old tire is normal in hot climates (Arizona, Texas, Florida); deep cracking on a 2-year-old tire suggests the tire sat in a warehouse for years before sale, so verify the DOT code.
Sidewall Bulges or Bubbles
A bulge or bubble in the sidewall means the internal cord layer has separated from the rubber. The tire is one pothole away from a blowout. Replace immediately and do not drive at highway speed. Bulges almost always result from impact damage: a curb strike, a deep pothole, or a parking block.
Uneven Wear Patterns
Different wear patterns point to different problems:
- Center wear: Chronic overinflation. Check pressure monthly against the door-jamb placard, not the sidewall max — see how to check tire pressure.
- Edge wear (both edges): Chronic underinflation. Same fix.
- Inner-edge wear only: Negative camber or worn suspension bushings. Get an alignment.
- Outer-edge wear only: Positive camber, worn ball joints, or aggressive cornering.
- Cupping or scalloping (bald spots in a pattern): Worn shocks or struts. The wheel is bouncing.
- Feathered wear (smooth one direction, sharp the other): Toe misalignment.
If new tires are starting to show any of these patterns, fix the underlying cause before installing new rubber — otherwise the new set will wear the same way.
Vibration That Won't Balance Out
A persistent vibration at 50-70 mph that returns after balancing usually means internal belt separation. The steel belts have started to delaminate from the rubber, creating a high spot in the tire that no wheel weight can correct. Replace the tire.
How Long Do Tires Last?
A set of four all-season tires for a midsize sedan costs $620-$880 installed in 2026. A single tire-related crash claim averages $11,000. Replace at 4/32" tread or 6 years, whichever comes first.
Most all-season passenger tires last 40,000-70,000 miles or 3-5 years, whichever comes first, with significant variation by tire compound, vehicle weight, driving style, and climate. Manufacturer UTQG treadwear ratings on the sidewall give you a comparison number: a tire rated 700 treadwear theoretically lasts twice as long as one rated 350 under controlled testing. Manufacturer mileage warranties are a better real-world predictor: the Michelin Defender T+H carries an 80,000-mile warranty, the Continental TrueContact Tour carries 80,000 miles, and the Bridgestone Turanza QuietTrack carries 80,000 miles. Performance tires like the Michelin Pilot Sport 4S warranty only 30,000 miles for a reason.
Average Mileage by Tire Type
| Tire Category | Typical Lifespan | Example Models |
|---|---|---|
| Touring all-season | 60,000-80,000 mi | Michelin Defender T+H, Continental TrueContact Tour |
| Grand touring all-season | 50,000-70,000 mi | Michelin CrossClimate2, Bridgestone Turanza QuietTrack |
| Standard all-season (OE) | 40,000-60,000 mi | Bridgestone Ecopia EP422, Goodyear Assurance Fuel Max |
| Performance all-season | 40,000-50,000 mi | Michelin Pilot Sport A/S 4, Continental ExtremeContact DWS06 Plus |
| Max performance summer | 15,000-25,000 mi | Michelin Pilot Sport 4S, Bridgestone Potenza Sport |
| Winter (dedicated) | 4-6 seasons | Bridgestone Blizzak WS90, Michelin X-Ice Snow |
| EV-specific | 25,000-40,000 mi | Michelin Pilot Sport EV, Continental ProContact RX |
EV tires wear faster because the cars weigh more and instant torque chews tread off the drive axles. A Tesla Model Y Performance on Michelin Pilot Sport EV tires typically needs replacement at 15,000-20,000 miles — well under half of what the same driver might get from a Camry.
What New Tires Cost in 2026
New tire pricing depends on size, type, and where you buy. A set of four installed touring all-seasons for a midsize sedan runs $600-$900 in 2026; a set for a full-size SUV or pickup runs $900-$1,600; performance and EV tires push higher. Discount Tire Direct and Tire Rack offer the lowest sticker prices but charge for shipping and require a separate install shop. Costco includes lifetime rotation, balancing, and road hazard coverage but limits selection to about a dozen models. Dealerships are typically 15-30% more expensive than independents.
Installed Cost by Vehicle Class (2026 National Averages)
| Vehicle | Tire Example | Set of 4 + Install |
|---|---|---|
| Compact car (Civic, Corolla) | 205/55R16 Michelin Defender T+H | $620-$780 |
| Midsize sedan (Camry, Accord) | 215/55R17 Continental TrueContact Tour | $720-$880 |
| Compact SUV (CR-V, RAV4) | 235/60R18 Bridgestone Turanza QuietTrack | $880-$1,080 |
| Midsize SUV (Highlander, Pilot) | 245/55R19 Michelin CrossClimate2 | $1,040-$1,280 |
| Full-size pickup (F-150, Silverado) | 275/60R20 Michelin Defender LTX M/S | $1,240-$1,600 |
| EV (Tesla Model Y) | 255/45R19 Michelin Pilot Sport EV | $1,400-$1,800 |
| Performance (BMW M3) | 275/35ZR19 (rear) Michelin Pilot Sport 4S | $1,600-$2,200 |
Installation fees typically run $20-$30 per tire and cover mounting, balancing, valve stems, and disposal of the old tires. TPMS sensor service adds $5-$10 per tire if you have direct sensors. State and local tire taxes add another $1-$3 per tire in most jurisdictions.
Where to Buy
| Retailer | Price | Includes | Best For |
|---|---|---|---|
| Costco | Mid | Lifetime rotation, balance, road hazard, nitrogen | Common sizes, best value |
| Discount Tire / America's Tire | Mid | Lifetime rotation, balance, road hazard ($) | Wide selection, fast install |
| Tire Rack | Low (+ shipping + install) | Nothing — install elsewhere | Niche sizes, performance tires |
| Walmart | Low | Basic install | Budget all-seasons |
| Dealership | High | Vehicle-specific knowledge | Run-flats, OEM-matched sets |
| Local independent | Varies | Negotiable | Building a long-term relationship |
The Cost of Driving on Worn Tires
A blowout on a worn tire turns a $180 replacement into a much bigger bill. Roadside service is $75-$200 for a tow. If the blowout damages the wheel — common on low-profile performance tires — add $400-$1,200 for a replacement alloy. If you hit a guardrail, the cheapest body work starts at $2,500 and the average non-fatal tire-related crash claim runs $11,000 according to insurance industry data. NHTSA attributes roughly 11,000 crashes per year to tire-related causes, and tread depth below 2/32" is a documented contributor.
Beyond crashes, worn tires cost you fuel economy: tires below 4/32" produce 1-3% worse fuel economy because of increased deformation under load and slip during acceleration. On a 15,000-mile year at $3.60 per gallon and 28 mpg, that's $30-$80 in extra fuel per year you're paying to keep using tires that should be replaced.
Replacing only two tires? Put the new ones on the rear. This is counterintuitive on a front-wheel-drive car where the front tires wear faster, but Michelin's wet-handling tests and Tire Rack's published testing both confirm: deeper tread on the rear prevents hydroplane-induced oversteer, which most drivers cannot recover. Put the new tires on the rear and move the half-worn rears to the front. On AWD vehicles (Subaru, Audi, BMW xDrive), replacing only two is generally a bad idea — Subaru requires all four within 2/32" or the center differential overheats.
Tracking Tire Age and Wear
The DOT date code is permanent but inconvenient to check on every tire every year. Pinion logs each tire's purchase date, DOT code, and mileage, then sends a push reminder 6 months before the 6-year age window and again at 9 years for the 10-year hard limit. The app pulls your service intervals from your VIN, so if your vehicle's owner's manual specifies a shorter tire inspection cadence (Tesla and Porsche both do), the reminders match the manual.
If you'd rather track manually, snap a phone photo of each tire's DOT code the next time you have the car on a lift for an oil change, save the photos in an album with your purchase date, and set a calendar reminder for 5 years out. The goal is to check the date once a year after year 5 so you're never surprised.
When to Replace vs. When to Repair
Not every tire issue means replacement. Plug-and-patch repairs are legitimate for puncture damage in the tread area only, under specific conditions defined by the Tire Industry Association's RMA puncture repair standards:
- Repairable: Puncture in the tread crown area (the center portion of the tread), 1/4" diameter or smaller, with no internal damage. A proper repair is a patch-plug combination installed from inside the tire after dismount and inspection. Cost: $20-$45.
- Not repairable: Any sidewall puncture, any shoulder puncture (the outer 1.5" of tread), any puncture larger than 1/4", run-flat tires after being driven flat, or any tire with internal damage. Replace.
- Never trust: Tire-plug-only repairs (the rope-style plugs from the outside) on a tire that hasn't been dismounted and inspected. These are legal for emergency use only.
Only tread-area punctures under 1/4" diameter are repairable — and only with a patch-plug combo from inside. Sidewall damage, shoulder punctures, and run-flat tires driven flat all require replacement.
If the tire was below 4/32" when you got the nail, replace rather than repair — you're a few months from buying tires anyway.
Putting It Together
Check tread depth with a $8 gauge every 5,000-7,500 miles (most shops do this for free during rotations). Replace at 4/32", not 2/32". Read the DOT date code on each tire — plan replacement at the 6-year mark in hot climates or after 7-8 years anywhere, and never run a tire older than 10 years. Walk around the car once a month looking for sidewall cracks, bulges, and uneven wear, and fix any alignment issues before installing new tires. Two of these checks (the quarter test and a quick sidewall inspection) take less than three minutes per tire and are the cheapest insurance against a $11,000 crash claim.
Frequently Asked Questions
Vlad Kuzin
Developer of Pinion. Writes about car maintenance to help people save money and stay safe on the road.
