### Verify Fitment Before Finalizing Your Purchase For in-store purchases, bring a photo of your axle stamp, existing tire sidewall, or written notes of your axle specs to a Tractor Supply team member, who can use the brand’s internal cross-reference guide to confirm compatible tire sizes for your specific trailer model. For online orders, use Tractor Supply’s website fitment filter: enter your trailer’s make, model, and year, or input your axle GAWR, bolt pattern, and existing tire size to narrow results to confirmed compatible options. Before installing new tires, measure the gap between the inside of your trailer fenders and the fully loaded tire, as well as the space between the tire sidewall and trailer frame, to confirm no rubbing will occur with slightly larger or wider tire sizes. For dual-axle trailers, always install matching tires with identical size, load rating, and tread depth across all positions to prevent uneven wear, poor handling, and premature tire failure.
Informational article
Tractor Supply Trailer Tires: How to Match Size to Your Trailer Axle
## Overview Matching Tractor Supply trailer tires to your trailer axle starts with confirming three core axle and wheel specs, then cross-referencing those details with Tractor Supply’s inventory of ST-rated trailer tires to ensure safe load capacity, proper clearance, and correct bolt pattern alignment, no specialized tools or prior trailer maintenance experience required. ### Confirm Your Trailer Axle Core Specs First Start by locating the manufacturer’s stamped information on your trailer axle tube or spindle, which lists the gross axle weight rating (GAWR), the maximum total weight the axle is designed to support. Next, identify your wheel bolt pattern: count the number of lug holes on your trailer wheel, then measure the distance in inches between the centers of two opposite lugs to get the circle diameter (common trailer bolt patterns include 4x4, 5x4.5, and 6x5.5). Finally, note the full size printed on the sidewall of your existing trailer tire, formatted as ST[width]/[aspect ratio][construction type][wheel diameter], for example ST205/75D14, which notes the tire is 205mm wide, has a 75% aspect ratio, uses diagonal ply construction, and fits a 14-inch wheel. Never use passenger car tires for trailer use, as they are not engineered to handle the unique load and sway demands of towing. ### Cross-Reference Specs With Tractor Supply Trailer Tire Inventory Tractor Supply stocks a wide range of ST-rated trailer tires sized to fit the most common consumer and light commercial trailer axle configurations. First, calculate the minimum per-tire load requirement by dividing your axle’s GAWR by the number of tires mounted to the axle (for example, a 3500lb GAWR with two tires requires each tire to support at least 1750lb; always select a tire with a load capacity rating 10-15% higher than this minimum for a safety margin and to account for uneven load distribution). Match the tire’s overall diameter to your existing size, keeping within 1 inch of the original factory specification to avoid fender or frame clearance issues, and inaccurate speedometer readings if your trailer is equipped with a sensor. If you are keeping your existing trailer wheels, confirm the tire’s bead seat diameter matches your wheel size (14 and 15-inch wheels are most common for standard utility, boat, and horse trailers). Tractor Supply also sells pre-mounted tire-and-wheel combos for buyers replacing both components, with options pre-matched to common axle bolt patterns.