# Smart Tire Picks > Smart Tire Picks is an educational tire site for US drivers. It explains how to read the door placard, set cold tire pressure, understand load index, speed rating, UTQG grades, DOT date codes, tread depth, and TPMS warnings, and how to compare tire categories. Reviews are editorial summaries of public manufacturer positioning, not lab tests. Content is general information only and is not professional or safety advice. Always confirm tire size, load index, speed rating, and pressure against your vehicle's door placard and owner's manual, and have tires installed by a licensed professional. The site does not publish lab results, ratings, or safety rankings. ## Guides - [All tire guides](https://smarttirepicks.com/guides/): Hub listing every guide grouped by task (pressure and placard, tread and age, ratings, seasons and storage), a question to guide lookup table, and a simple tire check routine. - [How to read your tire door placard](https://smarttirepicks.com/guides/placard/): Where the placard is, what each line means including the spare tire line, how it differs from the certification label, and what to do if it is missing. - [Tire placard checklist](https://smarttirepicks.com/guides/tire-placard-checklist/): A checklist of what to copy from your door label before shopping for tires. - [Recommended cold tire pressure (PSI)](https://smarttirepicks.com/guides/tire-pressure/): Why the placard PSI, not the sidewall maximum, is the target, what cold pressure means, how spare PSI can differ from road tire PSI, and how much pressure drops in cold weather (about 1 to 2 psi per 10°F, per NHTSA and USTMA) with a client side PSI drop calculator. - [Load index and speed rating explained](https://smarttirepicks.com/guides/load-index-speed-rating/): How to read the service description, a chart of common passenger load indexes and speed symbols, and XL versus standard load notes. - [DOT date codes and tire age](https://smarttirepicks.com/guides/dot-date-codes/): How the four digit DOT date code shows the week and year a tire was made, and why age matters alongside tread. - [When to replace your tires](https://smarttirepicks.com/guides/when-to-replace/): Replacement signals including tread depth, damage, irregular wear, age, and seasonal sets. - [How to check tire tread depth](https://smarttirepicks.com/guides/tread-depth/): Wear bars, tread depth gauges, the limits of coin tests, a 32nds to mm tread depth chart and converter, and when to see a licensed professional. - [UTQG tire grades explained](https://smarttirepicks.com/guides/utqg/): What UTQG treadwear, traction, and temperature grades mean and what they do not mean, with NHTSA and eCFR citations. - [Tire plug vs patch](https://smarttirepicks.com/guides/tire-plug-vs-patch/): Why a plug alone or a patch alone is not a proper repair, the USTMA and TIA rules (tire off the wheel, tread area only, 1/4 inch or 6 mm maximum, no overlapping repairs, not at 2/32 inch tread), roadside string plugs and sealant kits as temporary fixes, with a client side repairable checker. - [Tire sidewall bulge: is it safe to drive?](https://smarttirepicks.com/guides/sidewall-bulge/): Why an outward sidewall bulge or bubble signals internal damage (usually pothole or curb impact) and needs replacement, never repair; how to tell it from a cosmetic radial sidewall indentation per USTMA; what to do now; warranty and road hazard notes from Bridgestone, Uniroyal and Hankook; client side bulge or dent checker. - [Plus sizing tires: can I put bigger tires on my car?](https://smarttirepicks.com/guides/plus-sizing/): Continental PSIB 06-03 six checks (load capacity and speed rating at least stock, never below placard pressure, rolling circumference within about plus or minus 3%, approved rim widths, clearance); plus one and plus two example table; Standard Load to Extra Load pressure chart; AWD and staggered notes; client side plus size finder. - [All weather vs all season tires: which do you need?](https://smarttirepicks.com/guides/all-weather-vs-all-season/): all weather tires carry the 3PMSF symbol (USTMA TISB 37 packed snow traction test vs a reference tire) while most all season tires carry only M+S (TISB 10, no snow test); side by side table with winter tires; Quebec Dec 1 to Mar 15 pictogram rule; BC 3.5 mm tread and M+S or 3PMSF; one set vs two; client side climate picker. - [How long do winter tires last?](https://smarttirepicks.com/guides/how-long-do-winter-tires-last/): Most winter tires last about 3 to 4 seasons (Consumer Reports guideline 2 to 3); replace for snow use near 6/32 inch and do not start a winter below 4/32 inch (BC legal minimum 3.5 mm); some winter compounds are designed for the upper tread; age limits 6 to 10 years; fall checklist and tips. Cites Consumer Reports, Transport Canada, British Columbia, Bridgestone, NHTSA and USTMA. - [Tire balancing vs wheel alignment](https://smarttirepicks.com/guides/tire-balancing-vs-wheel-alignment/): Balancing adds rim weights so the tire and wheel spin smoothly (fixes speed dependent vibration); alignment sets camber, caster and toe (fixes pulling, off center steering wheel, edge wear); pull only when braking points to brakes; symptom table, free checks, client side symptom checker. Cites NHTSA, Michelin and USTMA. - [Nitrogen vs air in tires: is nitrogen worth it?](https://smarttirepicks.com/guides/nitrogen-vs-air/): Air is already about 78% nitrogen; nitrogen fills leak slightly slower (Consumer Reports one year test: 2.2 vs 3.5 psi; NHTSA lab: about two thirds the loss rate in new tires) but have no direct rolling resistance effect; USTMA says nitrogen is not necessary for normal service and topping up with air is fine; cost, green valve caps, TPMS note; client side air vs nitrogen pressure loss estimator. - [TPMS warning light explained](https://smarttirepicks.com/guides/tpms/): Solid versus flash then solid TPMS lights, cold weather pressure drops, spare tire caveats, and why monthly pressure checks still matter. - [Winter tires: when to switch and what to buy](https://smarttirepicks.com/guides/winter-tires/): Switch once temperatures stay around 45°F (7°C), 3PMSF versus M+S markings, all season versus all weather versus winter tires, studded tire rules by state, tread depth for snow, and why to fit four. Cites Transport Canada, USTMA, TRAC, CAA, WSDOT and British Columbia. - [Can you mix tires? Replace 2 or 4](https://smarttirepicks.com/guides/mixing-tires/): USTMA recommends replacing all four when possible. If replacing two, match size, load index and speed rating and put the new pair on the rear axle. Mixing brands is discouraged. AWD and 4WD need closely matched diameters. Cites USTMA, BFGoodrich and Toyo TSD-21-001. - [How long do tires last?](https://smarttirepicks.com/guides/how-long-do-tires-last/): Most all season tires last about 40,000 to 70,000 miles (truck and SUV about 50,000 to 75,000), roughly 3 to 6 years at the FHWA average of 13,476 miles a year. Age limits: Goodyear replaces at 6 years in service; Michelin and Continental at 10 years from manufacture; NHTSA notes 6 to 10 years. What wears tires faster, how to make them last, and a client side tire life estimator. Cites Goodyear, Michelin, Continental, NHTSA and USTMA. - [Tire rotation patterns](https://smarttirepicks.com/guides/tire-rotation/): How often to rotate (owner's manual first, else 5,000 to 8,000 miles per USTMA), forward cross for FWD, rearward cross for RWD, rearward cross or X for AWD and 4WD, front to back for directional, side to side for staggered, when you cannot rotate, TPMS relearn and lug nut torque notes, with diagrams. Cites USTMA, Michelin, Tire Industry Association and Bridgestone. - [Seasonal tire storage](https://smarttirepicks.com/guides/seasonal-tire-storage/): How to store an off season set indoors, stacking versus upright, ozone and sunlight risks, and steps before reinstalling. ## Tools - [Free tire tools](https://smarttirepicks.com/tools/): Hub of free in browser tire calculators. - [Tire size comparison calculator](https://smarttirepicks.com/tools/tire-size-calculator/): Compare two sizes such as 225/65R17 and 235/60R18 for overall diameter, sidewall height, width, circumference, revs per mile, percent diameter difference and speedometer error at 30 and 60 mph, with a caution above about 3 percent per Continental and General Tire plus sizing guidance. Explains how to read a tire size. Runs client side, stores nothing. - [DOT date code decoder](https://smarttirepicks.com/tools/dot-date-code/): Enter the last four digits of a tire TIN (or the full DOT code) to get the manufacture week and year, the Sunday to Saturday date range per 49 CFR 574.5, and tire age today, with age guidance from NHTSA and Michelin. Handles three digit pre 2000 codes. Runs client side, stores nothing. ## Reviews - [Michelin CrossClimate 2 editorial overview](https://smarttirepicks.com/reviews/michelin-crossclimate2/): Category context, comparison points, and who it may or may not suit, based on public manufacturer positioning with no lab testing. - [Bridgestone Turanza QuietTrack editorial overview](https://smarttirepicks.com/reviews/bridgestone-turanza-quiettrack/): Comfort touring context, comparison points, and suitability notes, based on public manufacturer positioning with no lab testing. ## Comparisons - [All-season vs winter tires](https://smarttirepicks.com/comparisons/all-season-vs-winter/): When all-season tires may be enough, when winter tires are often considered, cost and logistics of a second set, and 3PMSF versus M+S symbols. - [Touring vs performance all-season tires](https://smarttirepicks.com/comparisons/touring-vs-performance-all-season/): A decision framework comparing ride, noise, handling, wear, and winter limits, with suitability notes. ## Fitment - [How to choose the right tire size](https://smarttirepicks.com/fitment/choose-tire-size/): A step by step process starting with the door placard, then load index, speed rating, climate category, and installation. - [All-season vs winter vs summer tires](https://smarttirepicks.com/fitment/all-season-vs-winter-vs-summer/): How the three tire categories differ by climate, with a quick comparison table. ## About and policies - [About Smart Tire Picks](https://smarttirepicks.com/about.html): who runs the site, what it is not, and its editorial approach. - [Contact](https://smarttirepicks.com/contact/): A form for editorial questions, corrections, and partnership inquiries. - [Terms of Use](https://smarttirepicks.com/terms/): The agreement with Joshua Israel Ventures LLC, general information only, as is disclaimer, limitation of liability, and Florida governing law. - [Privacy Policy](https://smarttirepicks.com/privacy/): Joshua Israel Ventures LLC as data controller, what the contact form, Cloudflare Web Analytics and GitHub Pages hosting collect, how to make requests, and Florida governing law. - [Disclaimer](https://smarttirepicks.com/disclaimer/): Informational use, accuracy limits, no professional relationship, what readers must verify before buying, limitation of liability, affiliate and advertising disclosure, and Florida governing law. - [Affiliate Disclosure](https://smarttirepicks.com/affiliate-disclosure/): How the site may earn affiliate commissions in the future (no live affiliate links yet) and how that relates to editorial content.