# Tire Care and Safety Guide for Daily Drivers > Tire pressure from the door sticker, rotation, date codes, wear patterns, patch vs replace and AWD matching, explained plainly. Book a tire check today. Source: https://goodyearelitetireupland.com/about/resources/guides/tire-care-safety/ Last updated: 2026-09-17 Business: Goodyear Elite Tire Upland, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 **TL;DR:** Set **pressure** from the door sticker, **rotate** on schedule, watch the **date code**, and choose tires by load and speed rating, not by what is on sale. Tire safety comes down to four habits. Set pressure to the number on the driver door sticker, checked cold. Rotate tires on the schedule in your manual. Check the date code and replace tires that are aged or worn. Choose replacement tires by size, load index and speed rating, and match all four on most AWD cars. ## Why use the door sticker pressure and not the sidewall? The number on the tire sidewall is the maximum the tire can hold, not what your car needs. The right pressure is on the placard in the driver door jamb, set by the vehicle maker for the car's weight and handling. Check pressure monthly with the tires cold, before driving or after the car has sat a few hours. Pressure drops as temperatures fall and rises as tires warm. More detail is in the [tire pressure and care guide](https://goodyearelitetireupland.com/tires/tire-pressure-care-guide/). ## How do rotation and wear patterns work together? Front and rear tires wear differently, especially on front-wheel-drive cars. Rotation moves them around so all four wear at a similar rate. Skipping rotations can lead to cupping and a shorter tire life. Wear patterns tell you what else is wrong: - **Center wear:** too much air - **Both edges:** too little air - **Inner edge:** alignment - **Cupping:** worn shocks and missed rotations See [tire rotation and balancing](https://goodyearelitetireupland.com/tires/tire-rotation-balancing/) and [tire wear patterns](https://goodyearelitetireupland.com/tires/tire-wear-patterns/). ## How old is too old for a tire? The last four digits of the DOT code show the week and year a tire was made. Rubber ages with time and heat, even when the tread looks fine. Look for cracks in the sidewall or between tread blocks. Guidance on age varies by vehicle and tire maker, so check your owner manual. We inspect older tires closely and show you what we see. The [tire age tool](https://goodyearelitetireupland.com/about/resources/calculators/tire-age/) weighs age against tread depth. ## When can a flat be patched? A puncture in the main tread area of a healthy tire can usually be repaired from the inside with a patch and plug. Punctures in the shoulder or sidewall, large cuts, and tires driven while flat usually mean replacement. We take the tire off the wheel and inspect the inside before deciding. An outside plug alone is a temporary fix. See [flat tire repair](https://goodyearelitetireupland.com/tires/flat-tire-repair/). ## How should replacement tires be chosen? Goodyear fitment starts with the right size, load index and speed rating for your vehicle, not with what happens to be on sale. Trucks that tow or haul may need a higher load range. EVs are heavy and often need tires rated for that weight. On many AWD vehicles, all four tires should match in size and have similar tread depth. A large mismatch can strain the drivetrain. That is why one damaged tire on an AWD car sometimes means more than one new tire. See [new tires and brands](https://goodyearelitetireupland.com/tires/new-tires-brands/). ## Can tires go on the same day, and what can you check yourself? Same-day installation is possible when your size is in stock and a bay is open. Call (909) 608-7699 with the size from the sidewall and we check. Installation includes mounting, balancing, a TPMS check and torquing the lugs. You can check pressure, look at tread and wear, read the date code and spot sidewall cracks yourself. Leave mounting, balancing, TPMS programming and alignment to a shop. ## How do you read the size, load index and speed rating? Everything a shop needs to match your tires is printed on the sidewall. The size comes first, then a service description: a number for load index and a letter for speed rating. The replacement should meet or exceed what your vehicle maker lists on the door placard, never fall below it. | Marking | What it tells you | Why it matters | |---|---|---| | Width | Tire width in millimeters | Must fit the wheel and clear the body | | Aspect ratio | Sidewall height as a share of width | Changes ride and speedometer accuracy if wrong | | R and rim size | Radial build and wheel diameter | Must match the wheel exactly | | Load index | How much weight each tire can carry | Heavy SUVs, trucks and EVs need enough capacity | | Speed rating | The top sustained speed the tire is built for | Going lower than the placard is not advised | | DOT code | Maker, plant and build week and year | Tells you the tire's age | Take a phone photo of the sidewall before you call. It makes the size check fast. ## How does summer heat change tire care? Hot pavement and long afternoons raise tire temperature, and pressure climbs with it. That is why a reading taken after a midday drive looks high. Do not let air out of hot tires to reach the placard number; they will be low once they cool. Check in the morning before you drive instead. Heat also ages rubber. Tires on cars parked outside all summer can crack sooner than tires on garaged cars, even with plenty of tread. Watch for: - **Fine cracks** in the sidewall or at the base of tread blocks - **A tire that loses air** every week or two without a visible nail - **Low pressure on a loaded car** before a trip toward the mountains or the desert, where long grades and heat stack up ## How much tread do you need for the first rain? Tread grooves move water out from under the tire. As tread wears, the tire needs more distance to stop on wet roads and can start to hydroplane at lower speeds. After months without rain, the first storm lifts oil and dust off the road, which makes worn tires feel worse than they did last winter. Check tread before the rainy season, not during it. Look for the wear bars molded across the grooves; when the tread is close to level with them, plan replacement. A tread gauge at the shop gives an exact reading on every tire, including the inner grooves you cannot see easily. ## What should you know about the TPMS light and the spare? The tire pressure monitoring light comes on when one or more tires falls well below the placard number. A steady light means low pressure somewhere, so check all four with a gauge. A light that flashes and then stays on usually means a sensor or system fault, not a tire. The spare ages like any tire, even unused. Check its pressure every few months, and on cars with a compact spare, remember it is for short, slow trips to the shop only. Some newer cars carry a repair kit instead of a spare; know which one yours has before you need it. ### Monthly tire routine 1. Check all four and the spare with a gauge, cold. 2. Look across each tread for uneven wear. 3. Scan sidewalls for cuts, bulges or cracks. 4. Note any pull or vibration and mention it when you book. ## Needed now versus can wait ### Needed now - Tread at or near the wear bars - Sidewall bulge, cut or exposed cords - Tire losing air repeatedly - Mismatched tread on AWD beyond the maker limit ### Can wait - Nitrogen fill instead of air - Road force balancing when standard balance rides smooth - Upgrading to a different tread style for looks ## Frequently asked questions ### How often should I check tire pressure? At least once a month and before long trips, with the tires cold. Use the pressure on the driver door sticker. Do not rely on the TPMS light alone, since it usually warns only after pressure is already quite low. ### Do I need to replace all four tires on my AWD car? Often, but not always. It depends on your vehicle maker guidance and how much tread the other tires have. We measure all four and check the manual before recommending one, two or four. ### Can I mix tire brands? It is best to keep matching tires on the same axle, and on AWD vehicles matching all four is often required. Mixed brands and tread designs can change how the car handles, especially in the wet. ### Why is my tire pressure light on in the morning but off by lunch? Cold air holds less pressure, so a tire that is slightly low can trigger the light on a cool morning and read fine once it warms. The light is telling you the tires are near the edge. Set them to the door placard number while cold. ### Can I put a different size tire on my car? Only within what your vehicle maker allows. A different size can change speedometer readings, clearance, stability control and, on AWD cars, drivetrain wear. Bring the size from your door placard and we check which options fit before recommending anything. ### Should I get an alignment with new tires? It is a good idea, especially if the old tires wore unevenly or the car pulled. Old tires can hide an alignment problem that new tires reveal quickly. An alignment with a printout protects the new set from early edge wear. ### Does nitrogen make tires safer? Nitrogen is a dry fill that may lose pressure a little more slowly. The safety benefit comes from having the correct pressure, which you can maintain with regular air and monthly checks. ## Related pages - https://goodyearelitetireupland.com/tires/new-tires-brands/ - https://goodyearelitetireupland.com/tires/tire-installation/ - https://goodyearelitetireupland.com/specials/tire-alignment-packages/ - https://goodyearelitetireupland.com/contact/book-appointment/ --- Call (909) 608-7699 or book at https://goodyearelitetireupland.com/contact/book-appointment/