A 7.00-15LT Load Range C is 29.6" in diameter, 8.0" wide on a 5.5" rim, with an allowable rim width range of 5" to 6 1/2", with a load carrying capacity of 1710# at 45 psi.
An ST205/75R15 Load Range C is 27.1" in diameter, 8.0" wide on a 5.5" wide rim with an allowable rim width range of 5" to 6 1/2", with a load carrying capacity of 1820# at 50 psi.
So an ST205/75R15 is almost a direct replacement, except the diameter is 2 1/2" smaller. However, the ST has a speed limitation of 65 mph, where the LT may or may not have a speed rating.
Personally, I think it would be wise to upgrade to a larger tire (which also has more load carrying capacity!)
An ST225/75R15 Load Range C is 28.3" in diameter, 8.8" wide on a 6" wide rim, with an allowable rim width range of 6" to 7", with a load carrying capacity of 2150# at 50 psi. That means that 1) the width of the rim must be checked, and 2) the side clearance must be checked.
A 195/70R15C 104/102R is 25.8" in diameter, 7.9" wide on a 6" wide rim, with an allowable rim width range of 5" to 6", and a load carrying capacity of 1984# at 65 psi. This is much smaller in diameter, and requires more inflation pressure.
A P235/75R15 XL is 28.9" in diameter, 9.3" wide on a 6.5" rim with an allowable rim width range of 6" to 8", and a load carrying capacity of 1985# at 41 psi.
So you will need to 1) check the rim width, and 2) check the side clearance.
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