Tire School

DOT date code 2325 decoded as week 23 of 2025
How Old Are Your Tires? Reading the DOT Date Code on a Truck Tire
Rubber ages whether or not you run it. Find the four-digit date code on the sidewall, learn the ages that take a tire out of service, and know what age... Read more...
Load index 146 equals 6,610 lbs; speed rating L equals 75 mph
Load Index and Speed Rating: Reading a Truck Tire's Service Description
The numbers and letter after a truck tire size are its working limits: what one tire carries single, what it carries in duals, and the speed it holds at that... Read more...
DOT badge certified to FMVSS 119
Are Import Tires Safe? DOT Codes, FMVSS 119, and What They Actually Mean
The factory matters less than the certification. What a DOT code on a truck tire legally guarantees, why commercial radials certify to FMVSS 119, and the questions worth asking any... Read more...
M+S and Three-Peak Mountain Snowflake sidewall markings on a truck tire
M+S vs 3PMSF: What the Snowflake Means on a Truck Tire
M+S is self-certified tread geometry. The Three-Peak Mountain Snowflake is a tested snow-traction rating. What each one means on a commercial tire, why fleets spec severe-snow on the drive axle,... Read more...
Tire size 295/75R22.5 broken down into width, aspect ratio, and rim diameter, with 146/143 L dual service description
How to Read Your Tire Size: 11R22.5 and 295/75R22.5 Explained
Every number on a truck tire sidewall means something. Decode width, rim diameter, ply rating and the dual service description — and see why 11R22.5 and 295/75R22.5 don't belong on... Read more...