Even just a pound or two of underinflation in your tires can be a problem. Why, though? There are several reasons.
Fuel economy: If you ever rode a bicycle with a low tire, you know that it feels like you’re riding through wet cement due to the added rolling resistance. The same thing is happening with your car, and compromising your fuel economy. Over the course of 10,000 miles per year, that can add up to 150 gallons of gas or $500 out of your pocket!
Handling: Low tire pressure means poorer control and longer stopping distances. At high speeds, in particular, this can be downright hazardous.
Premature tire wear: Underinflated tires are under a lot of stress, especially their steel ...[more]
Ever wonder what the designations stamped on your tire sidewall actually mean? We’d like to break it down for you.
Let’s take for instance, “P195/60R15 87S”. This is a full service description of a tire.
In this case, “87S” denotes a tire’s load capacity and speed rating. The higher the number, the greater the load capacity – an 87 load capacity means that tire can support 1,201 pounds. Speed ratings range from L (75 mph) through V (149 mph), and an S speed rating means the tire is good for 112 mph. W, Y, and Z-speed rated tires are available for extreme performance cars and are rated as high as 186 mph.
As for the rest of the information:
--“P” denotes Passenger Tire
--195 is the tire’s width from s ...[more]
No one wants to be stuck on the side of the road in the blazing summer sun changing a flat – especially on vacation. So make sure your tires are inflated to the appropriate pressure. This means keeping your tires at the pressure recommended by the manufacturer (check your vehicle’s owner manual for this information), not to the maximum pressure found on the tire's sidewall.
Having over-inflated tires can be dangerous in the summer heat. Tire pressure typically goes up about one pound per square inch (PSI) for every 10 degrees Fahrenheit that the temperature rises. Friction also causes tires to get hotter as they roll.
So if you go for a long road trip on a sizzling summer afternoon with your tires at maximum inflation, it could be a ...[more]