Bike Trailer Donut Hitch
Universal Seat-Stem Bike Trailer Hitch Adapter
Quickly and securely attach your two-wheel cargo, pet, or bike trailer with no permanent mount required. This rubber riveted “donut” hitch clamps around your bicycle’s seat stem (fits approx. ¾″ × ¾″ square tube) and lets you swap the trailer between bikes in seconds — perfect for touring, family hauls, or everyday errands.
Color may vary from black or blue as pictured.
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Description / Bike Trailer Donut Hitch
Effortless Hitching for Bike Trailer Adventures. Note: The hitch will only fit trailers with a square-tube gooseneck tongue that curves up to seat height, preferably 3/4" x 3/4". It will not fit round tube tongues.
Transform your bike into a tow rig in seconds with our premium Bike Trailer Donut Hitch, engineered for riders who demand flexibility and reliability. Whether you’re hauling a cargo trailer for gear, a pet trailer for your four-legged companion, or switching between bikes on a long ride, this universal seat-stem adapter gives you freedom without permanent mounts.
Key Features & Benefits
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Universal Seat-Stem Fit – Fits inside a ¾″ × ¾″ square tube; easily shaved for smaller tubes. Ideal for bikes with seat stems or square-section tubing.
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Quick-Swap Design – No need for drilled axle mounts or custom brackets; clamp the rubber donut around the stem, attach the trailer arm, and you’re off. Perfect for multiple bikes.
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Flexible Use-Cases – Works for 2-wheel cargo trailers, pet trailers, family bike-trailer setups; compatible with typical gooseneck coupler arms and hitches used on Amish-style and other trailers using a gooseneck hitch made from square tubing.
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Durable Construction – Made from a high-quality rubber blend that resists wear, vibration, and harsh weather.
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Compact & Travel-Ready – Lightweight, low-profile design means you can pack it for touring or switch bikes mid-trip without bulky hardware.
Why Choose This Hitch Adapter?
Many “universal bike trailer hitch” solutions require axle mounts or permanent clamps that tie the trailer to a single bike. Our seat-stem-mounted “donut” hitch gives you true flexibility, letting you tow multiple bikes as needed—ideal for families, bikepacking trips, pet excursions, or urban errands.
Compatibility Notes & Fitment Tips
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Designed to fit square seat-stem tubes, approx. ¾″ × ¾″ (≈19 mm). If your tube is smaller, shave off excess rubber to achieve a snug fit.
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Check clearance and alignment: ensure your trailer arm clears the rear wheel and doesn’t rub or bind during turns.
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Not recommended for hefty loads (over 200 lb) unless your bike and axle are rated accordingly. (See industry note on heavy-duty hitch mount design).
Installation Guide (Quick Steps)
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Slide the rubber donut around the seat-stem tube until snug.
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Insert the trailer arm into the square receiver, and secure the pin or bolt as supplied.
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Verify alignment and clearance by turning the handlebars entirely left and right.
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Load your trailer gradually and test the setup in a safe, flat area before full use.
Specifications
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Fit: ~¾″ × ¾″ square tube (or trimmed to suit smaller)
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Material: Durable rubber composite
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Color: Black or Blue (may vary)
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SKU: SKU-1489 cottagecraftworks.com
About Us
At [Cottage Craft Works, we specialize in high-quality bicycle trailer accessories, Amish-built for durability, ease of use, and a superior riding experience. Add this hitch adapter to your bike gear and get on the path to smooth, safe towing.