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When you’re logging long miles in the heat, this Rambler ST145/R12 Radial Trailer Tire keeps its cool. It’s an 8-ply tire with a 1,230-lb maximum load at 65 psi and a speed rating of 81 mph (M). The radial design reduces rolling resistance and heat buildup, so it runs steadier on the highway and lasts longer. It meets DOT specifications and exceeds FMVSS standards, so it’s ready for real-world towing.
This tire’s construction is all about strength where it counts. Double steel belts are reinforced with double polyester cords to handle heavy loads without sacrificing flex or comfort. A nylon overlay wraps the tread area to help prevent tread separation, adding another layer of security when you’re hauling gear or equipment that can’t afford downtime.
Radial ply tires like this Rambler have cords laid out at a 90-degree angle to the direction of travel. That means less internal friction, less rolling resistance, and cooler running under load. The result is a steadier ride that tracks straight at highway speeds — perfect for those long hauls where stability matters most.
The Rambler ST145/R12 fits standard 12" diameter wheels with a 4" width, giving you an easy match when replacing worn tires. With a 21.3" overall diameter, it provides consistent clearance and stance. Whether you’re upgrading from a similar size like 4.8-12 or matching an existing setup, this tire drops right in with no surprises.
1. Count the lug holes
Look at the wheel hub or the back of the wheel and count how many lug holes there are(also called bolt holes).
Common configurations include: 4-lug, 5-lug, 6-lug and 8 lug
2a. For even lug counts (4-lug, 6-lug, 8-lug)
Measure from the center of one lug hole directly across to the center of the hole opposite it.
Common configurations: 4 on 4", 6 on 5.5", 8 on 6.5"
2b. For odd lug counts (5-lug)
Measure from the center of one lug hole to the outer edge of the hole directly across (not center-to-center since there's no directly opposite hole).
Common configurations: 5 on 4.5" (most popular), 5 on 5", 5 on 4.75", 5 on 5.5"
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews
Claire H.
9/1/2026
Glad to hear they’ve been working well and holding air without affecting the ride! No worries about the photos—we appreciate you sharing the one you could. Have you noticed any change in how the camper handles when driving?
Brooke M.
5/21/2025
Happy campers is the goal! Thanks for sharing the photo :) Trailer looks ready to go! Any upcoming plans for a trip?
Do you have a question about this Trailer Tires and Wheel?
Info for this part was:
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Brooke M.
2/26/2025
Yes! If you need to return them feel free to reach out to me and I can help get that started for you. These tires will fit 12 inch diameter wheels - how big are your wheels youre wanting the tires for?