I have the st23580r16 on a 2011 321 outback all i wanna do is change them out for LT tires, what are my choices
What is the GVW of the 5er? What weight range tire are on the 5er now? what are your axle ratings? If 6,000# axles....I like the Michelin XPS RIBS....if "E" rated is applicable...."IF" a G rated tire, your limited to several, but the GY G614RST tires are for 7,000# axles. There are several other LT tires that will work with 6,000# axles that will probably be mentioned, but again, would be nice to know the 5er's GVW and what load range the OEM tires are to better answer your question.
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It's not as simple as it sounds...depending on manufacturer, an LT tire of an "equivalent" size may have a lower load rating.
This link to a Goodyear site indicates that an LT245/75R16E has only 2680 pounds of capacity, which is considerably less than the 3,420 pounds listed for the ST23580R16E's you're running now.
There's also a considerable difference in tread depth/design. Since it has to serve on drive/steer axles, the LT's tread is quite a bit deeper/more aggressive. Since trailer tires need only "follow" the tow vehicle, the tread is shallower and straighter. This design not only helps prevent the towed unit from trying to "steer" the tow vehicle, better rolling resistance performance results in fuel savings overall.
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Our fiver runs about 18,500 lb. loaded, (20k GVWR, 3,500 lb. pin wt.). Two 9,000 lb. axles with duals (eight tires).
We ran over 50k miles on the same size B F Goodrich LTs and have over 10k on the Michelins. I run 65 psi cold, use Pressure Pro, and had one failure in that time due to a nail in a sidewall - no on road failures (knock on wood!).
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Agree with Dennis MM. Michelin radials are expensive but worth the price. Ran them on my 5er and only changed after 5 years. Never had a problem with them. On the new 5er, immediately replaced the OEM tires with Michelin XTA radials.
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As I stated above, believe the Michelin XPS RIBS would be a better tire for the axle weight on his 5er. Maxxis makes a good one also...But the RIBS have proven out; expensive, but WELL worth the money for the security they will afford the OP.