The best plastic boat trailer fender depends on your tire’s actual dimensions, axle setup, and mounting points. For many 13-inch single-axle wheels, the Tie Down two-pack offers detailed fit measurements, while ECOTRIC’s 13-inch fenders add step pads. ALMULOO is another pair option for 13-inch boat-trailer wheels. For other setups, consider ECOTRIC’s 12-inch pair or Tie Down’s single replacement fender for 14- to 15-inch rims. Check clearance and mounting dimensions before choosing.
| Product | Best For | Fit Information |
|---|---|---|
| Tie Down 13-inch pair | Measured replacement installations | 13-inch wheel setups; confirm slot spacing |
| ECOTRIC 13-inch pair with steps | Added step surface | Single axle, 13-inch wheels |
| ALMULOO 13-inch pair | Boat trailers needing a matching pair | Single axle, 13-inch wheels |
| ECOTRIC 12-inch pair | Compact 12-inch wheel setups | Single axle, 12-inch wheels |
| Tie Down 14–15-inch replacement | Replacing one larger fender | 14–15-inch rims; 11-inch tire coverage |
Tie Down 13-Inch Single-Axle Fender Pair
This pair is best for owners replacing both fenders on a single-axle trailer with a 13-inch wheel setup. Tie Down lists compatibility with many utility, boat, cargo, and personal watercraft trailers. The fenders measure 40.38 inches long, 9.09 inches wide, and 12.18 inches high.
Its detailed mounting measurements make it a practical choice when matching an existing installation: slot spacing is approximately 31 to 34 inches, and bottom mounting holes are 4 inches center-to-center. The listing emphasizes checking tire clearance and mounting dimensions because trailer designs vary. Choose this option if those measurements match; avoid assuming every 13-inch tire setup will fit.
ECOTRIC 13-Inch Fenders With Steps
Best for single-axle trailer owners who want fenders with a step surface, this ECOTRIC pair is specified for 13-inch-diameter wheels. Each fender measures 29 by 9 by 12 inches and is made from high-density polyethylene. The listed step capacity is 300 pounds, and the product includes a built-in fender skirt.
Choose this model when a step is useful for access around the trailer and its dimensions fit the wheel area. The listing notes that drilling may be required, so installation may involve modifying mounting holes. Confirm the product dimensions before ordering rather than relying on wheel diameter alone.
ALMULOO 13-Inch Boat Trailer Fender Pair
This pair is best for boat-trailer owners looking for matching fenders for a single axle with 13-inch wheels. ALMULOO specifies high-density polyethylene construction and an injection-molded design. The skirted shape covers the top and sides of the tire and is intended to help reduce debris thrown up from the road.
The supplied information does not give overall fender dimensions or mounting-hole spacing. That makes this option less straightforward to compare with an existing fender by measurements alone. Check the listing and compare the physical fit with your trailer before purchasing; 13-inch wheel fitment by itself does not establish mounting compatibility.
ECOTRIC 12-Inch Wheel Fender Pair
Best for a single-axle trailer with 12-inch tires, this ECOTRIC pair uses injection-molded high-density polyethylene. The fenders have front and rear steps, with a listed top-step width of 6.9 inches and a 300-pound capacity. The grey finish is described as painted, and the product information also identifies the molded-in color as scratch-resistant.
Choose this pair when the wheel size and step layout suit your trailer. The provided details do not state overall fender dimensions or mounting spacing, so measure the existing setup and verify those details before ordering. Do not select it for a 13-inch wheel configuration based only on the similar product style.
Tie Down 14–15-Inch Replacement Fender
This single fender is best for replacing one damaged fender on a trailer with 14- to 15-inch rims and a tire profile matching its 11-inch coverage height. It measures 45 inches long, 11.38 inches wide, and 11 inches high. Its UV-protected, high-impact polyethylene construction is intended to resist fading, cracking, and sunlight-related degradation.
Choose it when one replacement is needed and the dimensions suit the trailer. It is sold as one fender, not a pair, so it may not be the right choice for replacing both sides. Verify tire clearance and mounting points; rim size alone does not confirm fit.
Buying Guide: How to Choose Plastic Boat Trailer Fenders
What measurements should you check?
Measure the tire’s actual outside diameter and width, then compare them with the fender’s coverage area and internal clearance. Also measure the fender’s length and height, mounting-hole locations, and the available space around the trailer frame. A wheel-size label is a starting point, not a substitute for these checks.
Should you choose a pair or one replacement?
Choose a pair when replacing both sides or when you want matching fenders. A single replacement can suit a one-sided repair, but compare its shape and dimensions with the fender that remains. Check the product description carefully: some listings specify one fender, while others identify a pair.
Are step fenders useful?
Fenders with steps add a surface for stepping near the trailer. Compare step width, listed capacity, and the mounting arrangement with your intended use. Do not treat a step’s stated capacity as evidence that every installation or mounting surface will support that load.
What material details matter?
High-density or high-impact polyethylene is specified for several options in this guide. Some listings also describe UV protection, impact resistance, or molded-in color. Use only the product’s stated attributes when comparing models, and consider how the fender will be exposed to sunlight, road debris, and water.
Frequently Asked Questions
Do plastic boat trailer fenders fit every trailer?
No. Fit depends on tire dimensions, fender clearance, axle arrangement, and mounting points. Confirm these measurements before buying.
Does a 13-inch wheel guarantee a fit?
No. Trailers using the same nominal wheel size can have different tire diameters, widths, and mounting layouts.
Can I install a fender if the holes do not line up?
Some product listings note that drilling may be required, but installation needs depend on the trailer and fender. Check the mounting instructions and fit before modifying parts.
Are these products sold as pairs?
Some are listed as pairs and one Tie Down option is listed as a single replacement. Confirm the quantity in the product listing before ordering.