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Before buying trailer tires: ST construction and intended use
ST trailer tires (Special Trailer tires) are tires for travel trailers, boat trailers, utility trailers and car haulers, in sizes such as ST205/75R15 and ST225/75R15. ST trailer tires have stiffer sidewalls than passenger tires to limit trailer sway, and are not for use on cars, SUVs or pickups. Tires for semi-trailer axles are listed under commercial tires.
ST speed ratings to check when ordering
ST trailer tires without a speed symbol on the sidewall are rated for 65 mph. Newer ST trailer tires carry a speed symbol: J equals 62 mph, L equals 75 mph and M equals 81 mph. Towing above the speed rating of ST trailer tires overheats the tires and can cause tread separation and blowouts.
Choosing ST trailer tire load ranges
ST trailer tire load ranges set the maximum load and inflation pressure: an ST225/75R15 in load range D carries 2,540 lb at 65 psi, and in load range E carries 2,830 lb at 80 psi. The combined capacity of all tires on the trailer must exceed the trailer's loaded weight, listed as GVWR on the trailer's VIN plate.
Buying ST tires to match the trailer's placard pressure
ST trailer tires are bought to carry the trailer's load at the pressure on the trailer's placard, which on most trailers equals the maximum cold pressure molded on the ST tire's sidewall. A replacement ST tire whose maximum pressure sits below the placard figure carries less load and does not suit the trailer.
Signs it is time to order new trailer tires
ST trailer tires age out before they wear out on most trailers, because trailers spend months parked. The DOT date code on the sidewall shows the week and year of manufacture: 2324 means the 23rd week of 2024. Trailer owners commonly replace ST tires every 3 to 5 years regardless of tread depth.
Order a full set of trailer tires plus the spare, so every tire on the trailer shares the same age and load range.
Choosing ST, LT or P-metric tires for a trailer
P-metric tires are not suited to trailers, because the P-metric load rating is divided by 1.10 on trailer use. LT tires can replace ST trailer tires when the LT tire's load capacity meets the trailer's requirement; heavy fifth-wheel trailers often run 16-inch LT tires or 17.5-inch commercial tires.
Ordering trailer tires with NeoTires
Trailer tires are ordered by the ST size and load range on the current tires, such as ST225/75R15 load range E, plus one more for the spare. Search that size on NeoTires, compare ST trailer tires by speed symbol, load range and price, and add the full set to the cart. NeoTires dispatches trailer tires the same day nationwide across the US, with no shipping charge on tires marked Free shipping, and checkout offers Klarna, Affirm and Afterpay alongside paying in full.
Before buying trailer tires: ST construction and intended use
ST trailer tires (Special Trailer tires) are tires for travel trailers, boat trailers, utility trailers and car haulers, in sizes such as ST205/75R15 and ST225/75R15. ST trailer tires have stiffer sidewalls than passenger tires to limit trailer sway, and are not for use on cars, SUVs or pickups. Tires for semi-trailer axles are listed under commercial tires.
ST speed ratings to check when ordering
ST trailer tires without a speed symbol on the sidewall are rated for 65 mph. Newer ST trailer tires carry a speed symbol: J equals 62 mph, L equals 75 mph and M equals 81 mph. Towing above the speed rating of ST trailer tires overheats the tires and can cause tread separation and blowouts.
Choosing ST trailer tire load ranges
ST trailer tire load ranges set the maximum load and inflation pressure: an ST225/75R15 in load range D carries 2,540 lb at 65 psi, and in load range E carries 2,830 lb at 80 psi. The combined capacity of all tires on the trailer must exceed the trailer's loaded weight, listed as GVWR on the trailer's VIN plate.
Buying ST tires to match the trailer's placard pressure
ST trailer tires are bought to carry the trailer's load at the pressure on the trailer's placard, which on most trailers equals the maximum cold pressure molded on the ST tire's sidewall. A replacement ST tire whose maximum pressure sits below the placard figure carries less load and does not suit the trailer.
Signs it is time to order new trailer tires
ST trailer tires age out before they wear out on most trailers, because trailers spend months parked. The DOT date code on the sidewall shows the week and year of manufacture: 2324 means the 23rd week of 2024. Trailer owners commonly replace ST tires every 3 to 5 years regardless of tread depth.
Order a full set of trailer tires plus the spare, so every tire on the trailer shares the same age and load range.
Choosing ST, LT or P-metric tires for a trailer
P-metric tires are not suited to trailers, because the P-metric load rating is divided by 1.10 on trailer use. LT tires can replace ST trailer tires when the LT tire's load capacity meets the trailer's requirement; heavy fifth-wheel trailers often run 16-inch LT tires or 17.5-inch commercial tires.
Ordering trailer tires with NeoTires
Trailer tires are ordered by the ST size and load range on the current tires, such as ST225/75R15 load range E, plus one more for the spare. Search that size on NeoTires, compare ST trailer tires by speed symbol, load range and price, and add the full set to the cart. NeoTires dispatches trailer tires the same day nationwide across the US, with no shipping charge on tires marked Free shipping, and checkout offers Klarna, Affirm and Afterpay alongside paying in full.
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