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Sunday, August 30, 2015

Michelin Goodrich tire recall

Just heard about a tire recall which may apply to your pick-up truck or SUV.

Michelin Goodrich tire recall

NHTSA Campaign ID Number :15T016Synopsis :Michelin North America, Inc. (MNA) is recalling certain BFGoodrich Commercial T/A All-Season tire size LT275/70R18 125/122Q LRE, BFGoodrich Commercial T/A All-Season 2 sizes LT275/70R18 125/122R LRE, LT235/80R17 120/117R LRE, LT265/70R17 121/118R LRE, LT245/75R17 121/118R LRE, LT245/70R17 119/116R LRE, and BFGoodrich Rugged Terrain T/A sizes LT275/70R18 125/122R LRE and LT275/65R18 123/120R LRE.

 The affected tires may experience rapid air loss due to a rupture in the sidewall in the bead area. If the tire sidewall ruptures during use resulting in a rapid air loss, it can cause loss of vehicle control, increasing the risk of a vehicle crash. MNA will notify owners, and dealers will provide similar replacement tires free of charge. The recall began on August 24, 2015. Owners may contact BFGoodrich Consumer Care at 1-866-524-2638.

NOTE you will only get a notification if your vehicle/tire dealership filled in the registration card and gave it to you when you bought the vehicle/tires. AND you then finished filling out the card and mailed it in.

If you did not register your Michelin or Goodrich tires you can do so on-line HERE

Tuesday, August 25, 2015

What temperature for CIP "cold inflation pressure?

I occasionally see posts on the need to do an adjustment of your Cold Inflation Pressure ( CIP )when the temperature is not at some "standard".

Many times the "standard" is stated to be 70F or 68F. Neither of these are correct.

From a tire design standpoint CIP means when a tire has not been warmed up either by being in direct Sunlight or from having been run.
We are not talking about some chemistry lab experiment but real life. This is defined by the Tire & Rim Association, the organization that published the standards book for tire dimensions and recommended Load & Inflation for all kinds of tires, wheels and valves.
 These standards are primarily intended to provide "interchangeability" as we want to be sure that every 15" tire fits properly on a 15" wheel of the appropriate type. Or that the valve will properly seal against air leaks by having the hole in the wheel of the correct diameter.

Now you don't have to get all wound up with temperature probes or IR guns to confirm a tire has not been warmed up. Just follow the guideline that when checking or adjusting tire pressure to your CIP, the tire should not have been driven more than 2 miles in the previous 2 hours, AND that the tire has not been in direct sunlight or otherwise artificially warmed up in the previous 2 hours.
"Cold" really means when the tire is at the temperature of the surrounding air or what is called "Ambient" temperature.

So unless you are taking your RV to the Antarctic or to the Sahara desert you can use the above as a simple guideline. Even if I were planning a trip from the top of Pikes Peak to Phoenix in a single one day drive I would not worry about making adjustments based on expected temperature. Tires are designed to have a large tolerance for pressure increase due to variations in the surrounding temperature.

Remember the rule of thumb is that tire pressure will only change about 2% for every change of 10F so even going from 30F to 100F might only result in a pressure change of 14%. Now you would probably need to adjust the CIP the next morning before setting out but again you would set the CIP when the tire is in the shade and not driven on for a couple of hours.

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