Frame-mounted rear child bike seats: frame fit compared
Which frame-mounted rear child bike seat is likely to fit a particular bicycle frame?
THULE Yepp Nexxt Maxi: The installation diagrams specify a 27.2–40 mm round-tube range or a maximum 40 × 55 mm section, with 44 mm and 58 mm M6 bolts shown for the respective fit. The exact frame-mounted seat required little seat assembly beyond removing packaging and routing the support bars. Mounting the block used four of the supplied bolts and the included Allen key; two bolt lengths were supplied for different tube thicknesses. Thule Yepp 2 Maxi: Thule says the supplied quick-release bracket fits most round and oval bicycle frames, but recommends checking model-specific compatibility. The universal quick-release bracket is designed to let the seat be installed or removed in seconds and moved between compatible bicycles. THULE Yepp Maxi: The clamp fit a large compact-geometry Whyte Stirling well, but the reviewer cautioned that small compact frames may lack seat-tube space or put the child close to the rider's saddle. Installation on a 15-inch Specialized Rockhopper took about 30 minutes and the mount interfered with the seatpost quick release; the tester would not want to repeat the process. Thule Yepp 2 Mini: The user warns that the seat is not universal and reports concerns with carbon frames, very short head tubes and cables routed through the stem; checking the specific bicycle with a dealer is advised. On a trekking Cannondale, installation reportedly took about 15 minutes including reading the instructions and required only a hex key. Fit may be harder or impossible on other bicycles.
| Product | Why | Frame fit | Mounting | Weight |
|---|---|---|---|---|
| 1. THULE Yepp Nexxt Maxi sold by anbbaby.com | The installation diagrams specify a 27.2–40 mm round-tube range or a maximum 40 × 55 mm section, with 44 mm and 58 mm M6 bolts shown for the respective fit. | The installation diagrams specify a 27.2–40 mm round-tube range or a maximum 40 × 55 mm section, with 44 mm and 58 mm M6 bolts shown for the respective fit. manual | The mounting diagram specifies tightening four bracket fasteners to 8 Nm. manual | The seat weighs 4.6 kg. guide |
| 2. Thule Yepp 2 Maxi sold by anbbaby.com | Thule says the supplied quick-release bracket fits most round and oval bicycle frames, but recommends checking model-specific compatibility. | Thule says the supplied quick-release bracket fits most round and oval bicycle frames, but recommends checking model-specific compatibility. guide | The universal quick-release bracket is designed to let the seat be installed or removed in seconds and moved between compatible bicycles. guide | Thule lists the seat weight as 5 kg; the store rounds this to 11 lb. guide |
| 3. THULE Yepp Maxi sold by anbbaby.com | The clamp fit a large compact-geometry Whyte Stirling well, but the reviewer cautioned that small compact frames may lack seat-tube space or put the child close to the rider's saddle. | The clamp fit a large compact-geometry Whyte Stirling well, but the reviewer cautioned that small compact frames may lack seat-tube space or put the child close to the rider's saddle. review | Installation on a 15-inch Specialized Rockhopper took about 30 minutes and the mount interfered with the seatpost quick release; the tester would not want to repeat the process. review | - |
| 4. Thule Yepp 2 Mini sold by anbbaby.com | The user warns that the seat is not universal and reports concerns with carbon frames, very short head tubes and cables routed through the stem; checking the specific bicycle with a dealer is advised. | The user warns that the seat is not universal and reports concerns with carbon frames, very short head tubes and cables routed through the stem; checking the specific bicycle with a dealer is advised. review | On a trekking Cannondale, installation reportedly took about 15 minutes including reading the instructions and required only a hex key. Fit may be harder or impossible on other bicycles. review | The seat weighs 5.3 lb. guide |
Also cited in the text
- THULE Yepp Nexxt Maxi, assembly and tools: The exact frame-mounted seat required little seat assembly beyond removing packaging and routing the support bars. Mounting the block used four of the supplied bolts and the included Allen key; two bolt lengths were supplied for different tube thicknesses. review
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Written 2026-10-09T15:21:54.034Z.
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