Barry's Tire Tech

What you should get from this page: If you live in a hot climate, the tire age limit is 6 years.

In the article on weather cracking and tire aging – here!

Want to know if your tires are overloaded?

Uniform Tire Quality Grading (UTQG) is a US system for passenger car tires to allow consumers to make better choices when buying tires.

This article is about travel trailers (RV’s) that have ST type tires.

In this page, I am going to talk about how tire brands work.

This article is about how you can’t calculate the size of a tire’s footprint.

Vehicle Drift and Pulls and Tire Conicity: What you should get from this page: A drift or a pull will only hurt the car if the problem is alignment.

What you should get from this page: I think that the published alignment specifications are too wide – by half.

Rolling Resistance and Fuel Economy (Continued): Revised December 2025: I brought the page up to date and incorporated all the previous revisions.

Rolling Resistance and Fuel Economy: I once saw a study done by a vehicle manufacturer that said that tires consume 17% of the fuel consumption for a vehicle.

Work in Process If you came here to research what is causing your unusual and/or uneven tire wear, I suggest you start with this page on normal tire wear It will set the stage for what comes below.

If you came here to research what is causing your odd and/or uneven tire wear, I suggest you read this page first, then go here!

This article is about tire noise – what causes it, how tire manufacturers reduce it, and how the consumer can reduce it.

Tire Traction & Traction Testing – Wet: This article is about wet traction testing.

This article is about dry traction testing.

DO NOT MOUNT A 16″ TIRE ON A 16.5″ RIM!

Useful Lists and Such: EPREL Public website – EU’s listing of the rating for stuff with an energy label – including tires.

From Top Tire Review: Top Tire Review – Bringing tire knowledge to everyone, one tire at a time UTQG-TableDownload

UTQG SummaryDownload Here’s where this table comes from: UTQG table – Top Tire Review

Speed Ratings: Before we start, I want to remind everyone that these web pages are generally about passenger car tires.

Original Equipment tires are tires that are supplied to the vehicle manufacturer’s assembly plant.

From time to time, I will get questions concerning the use of modern tires in place of the tires that came originally on a vintage vehicle.

There are several tire standardizing organizations throughout the world, but I am going to concentrate on just three of them: The Tire and Rim Association (TRA) – The US organization (The cover of the 2005 Yearbook is at the top of this page) The European…

This article is about how tire dimensions work. – how they are specified by the tire standardizing organizations.

This article explains how tire load tables work.

WASHINGTON, DC, Aug. 9, 2000 — Saying the safety of consumers is the company’s first concern, today Bridgestone/Firestone, Inc., announced a voluntary recall of all Firestone Radial ATX and Radial ATX II tires in size P235/75R15 produced in North America,…

One of the fundamentals about tires is sizing.

There aren’t any real advantages to using nitrogen in a street tire.

CEC DATABASE 195 MEANSDownload

F-1805Download

These are charts showing the various kinds and configurations of balance weights for wheels. wheelweightchart2Download

GoodyearDatecodes1Download

GY Polyglas Date Coding Page 1 GY Polyglas Date Coding Page 2 GY Polyglas Date Coding Page 3 GY Polyglas Date Coding Page 4 GY Polyglas Date Coding Page 5 GY Polyglas Date Coding Page 6 GY Polyglas Date Coding Page 7 GY Polyglas Date Coding Page 8

rmadotcoding2009Download

As published by Tire Business, December 16, 2024 Tire Business DOT Codes Page 1 Tire Business DOT Codes Page 2 Tire Business DOT Codes Page 3 Tire Business DOT Codes Page 4 Tire Business DOT Codes Page 5

1950-51 TRA Cover Page: 1950-51 TRA Page 1-01: 1950-51 TRA Page 1-02: 1950-51 TRA Page 1-03: 1950-51 TRA Page 1-04: 1950-51 TRA Page 1-05: 1950-51 TRA Page 1-06: 1950-51 TRA Page 2-01: 1950-51 TRA Page 2-02: 1950-51 TRA Page 2-03: 1950-51 TRA Page 2-04: 1…

1960 TRA Cover Page: 1960 TRA Page 1-01: 1960 TRA Page 1-02: 1960 TRA Page 1-03: 1960 TRA Page 1-04: 1960 TRA Page 1-05: 1960 TRA Page 1-06: 1960 TRA Page 1-07: 1960 TRA Page 2-01: 1960 TRA Page 2-02: 1960 TRA Page 2-03: 1960 TRA Page 2-04: 1960 TRA Page…

Firestone ReportDownload

1970 TRA Cover Page 1970 TRA Page 1-01 1970 TRA Page 1-02 1970 TRA Page 1-03 1970 TRA Page 1-04 1970 TRA Page 1-05 1970 TRA Page 1-06 1970 TRA Page 1-07 1970 TRA Page 1-08 1970 TRA Page 1-09 1970 TRA Page 1-10 1970 TRA Page 1-11 1970 TRA Page 1-16 1970 TRA

Firestone ReportDownload