Common Trailer Fender Sizes (With Photos & Exact Dimensions Guide)

(Photos omitted for Shopify formatting, but descriptions are optimized for product listings.)

Trailer fenders come in a range of standardized sizes across the U.S. market. Whether you’re replacing an old fender, upgrading materials, or building a trailer from scratch, knowing the most common fender dimensions makes ordering far easier and guarantees proper fitment.

This guide breaks down every major trailer fender size by trailer type, wheel size, and axle configuration.

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1. Most Common Single-Axle Fender Sizes

Single-axle fenders are shorter and designed to cover one tire.

For 12”–13” wheels

Size: 23”–25” long × 7”–8” wide × 11”–13” tall

Best for: Small lawn trailers, jet ski, compact utility trailers

Profiles: Radius or flat-top

Materials: Steel, aluminum, galvanized, diamond plate

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For 14” wheels

Size: 26”–28” long × 8”–9” wide × 13”–14” tall

Best for: Utility trailers, light-duty enclosed trailers

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For 15” wheels

Size: 28”–32” long × 9” wide × 14”–16” tall

Best for: Standard utility trailers, enclosed trailers

Notes:

• 9” width is most common

• Diamond plate upgrade is popular

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For 16” wheels

Size: 28”–32” long × 9”–10” wide × 15”–17” tall

Best for: Light equipment trailers, car dollies

Notes:

• Use 10” width if tire section width is heavier

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2. Most Common Tandem-Axle Fender Sizes

These are used on 2-axle trailers and cover both tires with one long fender.

The #1 Most Common Fender Size in the U.S.

72×10×17 Teardrop Fender (Steel)

• Length: 72”

• Width: 10”

• Height: 17”

• Fits: 16”–17.5” wheels

• Material: 14-gauge steel (standard), diamond plate optional

• Applications: Equipment trailers, car haulers, utility trailers

If your trailer has 17.5” wheels → you MUST use 10” width.

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Second Most Common

72×9×17 Teardrop Fender

• Fits 15”–16” wheels

• Used on lighter tandem-axle setups

• 9” width is ideal for narrower tire profiles

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OEM-Specific Size

69×10 Radius Fender

• Length: 69”

• Width: 10”

• Height: ~16–17”

• Used on trailers with slightly tighter axle spacing

• Common for some factory utility trailers

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3. Common Diamond Plate Fender Sizes

Diamond plate fenders are popular for style + rigidity.

Single-Axle Diamond Plate

• 28” long × 9” wide

• 32” long × 10” wide

Tandem Diamond Plate

• 72×10×17

• 72×9×17

• Usually aluminum or steel, depending on trailer type

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4. Boat Trailer Fender Sizes (Aluminum & Galvanized)

Marine trailers use corrosion-resistant fenders.

Small Boat Trailers

23”–25” long, 7”–8” wide (12”–13” wheels)

Medium Boat Trailers

28”–32” long, 9” wide (14”–15” wheels)

Large Boat Trailers

60”–72” long tandem fenders (often radius-style)

Material:

Aluminum diamond plate or galvanized steel

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5. Best Fender Size by Wheel Diameter

Wheel Size	Recommended Fender Width	Recommended Fender Height	Typical Fender Length
13”	7–8”	11–13”	23–25”
14”	8–9”	13–14”	26–28”
15”	9”	14–16”	28–32” or 72” (tandem)
16”	9–10”	15–17”	28–32” or 72” (tandem)
17.5”	10”	17–19”	72” (tandem only)

6. Clearance Requirements (Applies to All Fender Sizes)

These must ALWAYS be met:

Vertical Clearance

✔ 2–4 inches above the tire

Horizontal Clearance

✔ 1 inch per side

Tandem Tire Spacing

✔ 3–4 inches between tires

Every common fender size is engineered to satisfy these rules.

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7. How to Know Which Fender Size You Already Have

Look for these signs:

If your fender is 72 inches long → You have a tandem axle fender.

If it’s 9 or 10 inches wide → You have a standard U.S. trailer width.

If the center “drops down” between the tires → You have a teardrop fender.

If it has a smooth curve with no drop → You have a radius fender.

If it’s shiny with raised texture → Diamond plate.

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8. Most Common Fender Sizes by Trailer Type

Trailer Type	Standard Fender Size
Utility Trailer	28”–32” single axle
Enclosed Trailer	28”–32” or 72” tandem
Car Hauler	72×10×17 steel teardrop
Equipment Trailer	72×10×17 steel (14G or 13G)
Boat Trailer	23–32” single axle, 60–72” tandem
Lawn Trailer	23–28” single axle

Conclusion

The U.S. trailer industry revolves around a core group of standardized fender sizes:

• Single axle: 23–32”

• Tandem axle: 72×9×17 and 72×10×17

• OEM variations: 69×10 radius

• Marine: 23–32” singles, 60–72” tandems

Once you know your wheel size, tire width, and axle spacing, selecting the correct fender becomes extremely easy.