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Barry's Tire Tech: Monthly Blog This is my way of pointing out news that I find interesting. Obviously my orientation is towards tires. Barry's Tire Tech: Bias vs Radial Tires (New July, 2025) I wrote this up because I saw a video on the subject and thought I could do a better job. The...

Rant: This isn't about EV tires, but about how Hankook is characterizing EV tires as something extra special. Ya' see, the YouTube algorithm decided I wanted to see videos about EV tires, so it recommended a bunch. It is clear Hankook gave some incentive to these YouTube content creators...

Guys, In April, 2025, NHTSA will require tires to have a 3 digit plant code (from 2 digits). The industry has been making the transition for quite some time. Here's a list created by Tire Business, a tire related newspaper: Barry's Tire Tech: Tire DOT Plant Codes I've also updated my...

Answer: only a little worse: Tyre Reviews: What happens if you mount a tire backwards? As a tire engineer, I also conclude that directional tires aren't that much better than non-directional tires. Nevertheless, Jonathan Benson has done excellent work here.

If you watched the NASCAR Bristol race - and you know me - you'll know I was very interested. Lots to unpack!! If you didn't watch the race, the tires were wearing extremely fast, apparently because the track (concrete) wasn't "rubbering up" - that is having rubber embedded into the...

Tire Reviews: Wide vs Narrow Winter Tires Tested The conclusion? It doesn't matter as much as choosing the actual make/model. I found this very interesting. I may use this as a basis for an article on my website - properly crediting Tyre Reviews, of course! If I have a criticism, it's that...

Guys, I am writing up something on tire brands and I don't quite know what to do. Bridgestone is the 2nd largest tire manufacturer in the world, yet their presence in the US market is pretty small. HOWEVER, a brand they own - Firestone - has a HUGE!! presence. They even have a chain of tire...

I don't know if this is a good idea or not, but I thought I'd post in this thread whenever I post a new/revised article. Here's a link to the main page: Barry's Tire Tech: Main Page Here are links for May, 2023: Barry's Tire Tech: UTQG Ratings (New May, 2023) Barry's Tire Tech: Followup on...

From Tire Business May 8, 2023 How does temperature affect rolling resistance? By Erin Pustay Beaven GREENVILLE, S.C. Range can be a very tricky thing. Electric vehicle range is, simply, inconsistent. It changes over time, across driving conditions and with temperature fluctuations. And...

Apparently some Michelin tires don't meet the Alpine (3PMSF) symbol requirements. First time I have heard of that. You received this email because you have requested to be notified by NHTSA if there is a safety recall regarding Tires. Please click on the following NHTSA Recall ID links to...

I am having trouble with my website. It isn't getting the proper symbols that I encode. For example, the dash seems to be a problem. Here's one of the pages where this seems to be a problem: http://barrystiretech.com/sttires.html And that first sentence is an example: This article is about...

I've run across a peculiar problem with the internet. When I try to access one particular website, it shows up briefly, then returns a "File not found" error. If I do that repeatedly, the third time the website shows up and stays. What's going on?

Just an FYI: The new tire sizes for F1 starting in 2022 are 305/720R18 and 405/720R18. That's the equivalent (more or less) to 305/45R18 and 405/30R18. The old sizes (2021) were 305/670R13 and 405/670R13 (305/55R13 and 405/40R13 - more or less). I note with interest that the front tires in...

From Tire Business, Mar 29, 2021 edition: Marked for winter driving Three-Peak Mountain Snowflake symbol makes things easier for consumers ********************************************************** Key points: There is a symbol which designates tires that pass a snow traction test. It's...

NHTSA (National Highway and Traffic Safety Administration) was originally supposed to publish a rule concerning the publication of rolling resistance data for tires in 2010, based on a mandate from the US Congress in 2007. There was a large problem with what they published (short version: It was...

I have a project, but I just don’t have the tools. That also means I need someone to do the labor. I want to determine what affect tread depth has on rolling diameter. I suspect it has very little effect, but I need some data to back it up. Here’s what I need: 1) A tire shaving machine. 2) A...

I am of the opinion that on those vehicles with a transfer case, the 4X4 feature shouldn't be used except at slow speeds - I'm thinking less than 15 mph. 1) Do I have this right? 2) Is there a note in the owners manual to this effect? The reason I am asking is that I am discussing 4X4 usage...

Last week, Microsoft automatically updated my computer and installed IE 11. Ever since then the program freezes after a minute or 2 and the only way to get the computer working again is to activate the Task Manager and delete running IE11. I've read that MS has had trouble with IE11, but the...

In the Aug 2013 issue of Grassroots Motorsports Magazine, they performed a tire test on the new Bridgestone RE-11 – an Autocross tire. They compared the tire to a Goodrich g-Force Rival. I note with interest that a prelude to the actual test was a skipdpad evaluation to determine the best...

As many of you are aware, I work for a major tire manufacturer. Every year at this time, we get lots of inquiries concerning the winter tire regulations in Canada. Here's a summary: The Snowflake symbol is required in British-Columbia on mountain roads from October 1st to April 30th. It is...