Simolary guides

Tire Guides

Tire sizes, load ratings, seasons and terrain types explained, so you can choose tires that fit your vehicle and the way you drive.

Tire GuidesWhen to Put On Winter Tires (and What the Snowflake Means)The 45°F rule of thumb, what the three-peak mountain snowflake and M+S marks mean, why winter tires go on all four wheels, and how to store the off-season set.Sep 28, 2026 · 5 min read
Tire GuidesWhy Tire Pressure Drops in Cold Weather (and What to Do)How much tire pressure drops as temperatures fall, why the TPMS light comes on during cold mornings, and how to check and…Sep 25, 2026 · 6 min readTire GuidesWhen to Replace Tires: Tread Depth, Age and Warning SignsTread depth, age and damage all decide when a tire is done. How to run the penny and quarter tests, read uneven…Sep 14, 2026 · 6 min readTire GuidesCommercial Truck Tires: Steer, Drive and Trailer ExplainedRib or lug, 11R22.5 or 295/75R22.5, Load Range G or H: a plain guide to commercial truck tires by wheel position, load…Sep 11, 2026 · 6 min readTire GuidesAll-Season vs. All-Terrain Tires: Which Fits How You Drive?Tight tread or open blocks? How all-season and all-terrain tires differ in noise, wear, snow ratings and fuel use, and how to…Sep 9, 2026 · 5 min readTire GuidesLoad Index and Load Range Explained: P-Metric, XL and LTLoad index, XL and LT load ranges all come back to one rule: a tire carries its rated load only at the…Sep 3, 2026 · 6 min readTire GuidesBuying Tires Online: Check the Fit, Then Plan InstallationA practical checklist for ordering tires online: confirm the fit from your placard and owner's manual, book a local shop for mounting,…Sep 1, 2026 · 6 min readTire GuidesAll-Terrain, Rugged-Terrain or Mud-Terrain: How to ChooseA/T, R/T or M/T? How the three off-road tread families differ in voids, sidewalls, noise, wear and snow ratings, and how to…Aug 26, 2026 · 5 min readTire GuidesTowing and Hauling Tires: A Checklist for Trucks and SUVsTowing puts extra weight on your rear tires. Here is how to read the door labels, check axle and tongue weights, set…Aug 21, 2026 · 5 min readTire GuidesTrailer Tires Explained: ST vs. LT, Load Range, Speed and AgeST tires are built for trailers. How to read load range and speed markings, set pressure, check weight, store tires and tell…Aug 16, 2026 · 7 min read
Not sure which tire fits?Start with the size on your driver's door-jamb placard, or call us with your vehicle details — Mon–Fri, 9 AM–5 PM MT.