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Comparing Benefits of LT Light Truck vs. ST Special Trailer Tires


if st are supposed to be better, why are so many people going from ST to LT because of blowouts with the STs.


Expert Reply:

In some applications a light truck tire, the LT type, will be preferable to the special trailer ST type tire. If driving off-road the stiffer sidewall of a bias ply LT tire may hold up better while the greater flex of a radial ST tire will work better for highway driving, especially at higher interstate driving speeds.

The main reason any trailer tire fails is excess heat. Excess heat builds up in a tire for three main reasons: incorrect pressure, overloading and driving faster than the tire's rated maximum.

LT and ST tires should ALWAYS be inflated to the maximum COLD tire pressure noted on the sidewall; it is never appropriate to under- or over-inflate a trailer tire for any reason. Tires have varying weight load ranges (a letter code system) and overloading a tire beyond its weight capacity also causes heat to build up. Driving faster than the tire's speed rating (also a letter code) will also drive up the tire temperature.

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