Plain-language help for choosing, reading and looking after your tires.
Data: tire sizes on new vehicles
What government sources say about winter tire rules: Quebec's December 1 to March 15 requirement, BC's signed routes, Ontario's insurance discount, and US chain and traction laws.
When winter tires are worth it, the 7°C (45°F) rule of thumb tire makers use, how winter, all-weather and all-season tires differ, and what a set costs.
Switch by temperature, not the calendar: the 7°C (45°F) guideline, legal dates, swapping tires versus a second set of wheels, torque, and how to store the off-season set.
How to pick a winter tire size for your vehicle: start from the door placard, when a smaller wheel (minus sizing) is an option, and the load index and speed rating rules.
Compare digital, dial and pencil tire pressure gauges on readability, batteries and accuracy, and learn where the right pressure number comes from and why to check cold.
What to check before you buy a portable tire inflator: pressure rating, duty cycle, 12V plug-in or cordless power, auto shut-off, gauge accuracy, hose length and storage.
A winter car kit checklist that starts with your tires: pressure, tread depth, chains or tire socks matched to your size, traction aids, then the general gear to carry.
How all-season, all-weather and winter tires differ, what the M+S and three-peak snowflake markings mean, and how to match a tire type to your winters.
A general walkthrough of buying tires online and getting them installed: delivery options, what a shop does, questions to ask and what to check on arrival.
Learn what the numbers and letters on a tire sidewall mean, from size and load index to speed rating, DOT code and UTQG grades, and where to confirm your size.
Find the DOT tire identification number on the sidewall and read the four-digit date code to learn which week and year your tire was made, step by step.
Check tread depth, tire age, sidewall damage and handling changes to decide when tires need replacing, and what to do before you shop for a new set.
Plus sizing means a larger wheel with a lower-profile tire. Learn the overall-diameter check, the 3 percent rule of thumb, and what that check does not cover.
How run-flat tires work, what they allow after pressure loss, and the trade-offs: TPMS, repair limits, replacement rules and switching to regular tires.
Replacing two tires can work on some vehicles, but four is the usual advice. See where new tires go, what changes with AWD, and what to check first.
What the load index number and speed rating letter on a tire mean, how to find the values your vehicle calls for, and why you should not go below them.
Where to find the right tire pressure, how to check it cold, what the TPMS light means under federal rules, and why it does not replace a gauge.
What tire rotation and wheel alignment do, how often to schedule them, when directional or staggered setups limit your options, and why records matter.
A plain-language look at tire warranty types, from defect coverage to treadwear and road hazard, plus the upkeep rules that can decide whether a claim is paid.
What is and isn't different about tires for electric vehicles: load index and HL markings, wear, noise and range, plus how to match tires to your door placard.
How highway, all-terrain and mud-terrain tires differ, what M+S and the snowflake symbol mean, and why LT and P-metric sizes are not interchangeable.
UTQG grades on a tire sidewall rate treadwear, wet traction and heat resistance. Learn what each grade measures, what it leaves out, and how to use it.