How to install a child bike seat
A rear child bike seat either clamps to a bracket on the seat tube or sits on a compatible rear rack. Which one you can use depends on your frame, the rack's rating and the child's weight, so check both manuals before you start.
- Time
- about 40 min
- Difficulty
- Moderate
- People
- 1 person
- Steps
- 7
Tools needed
- Allen keys (supplied)
- Tape measure
- Spanner
Parts to check first
Before you start, lay everything out on a soft surface (the flattened box works) and check it against the parts list in your manual.
- Child seat with harness and footrests
- Frame bracket or rack adapter
- Mounting tubes or rack clamps
- Foot straps and wheel guards
- Safety strap or lock key
Step by step
Step 1: Check the seat's child weight and age range, and that your bike and rack are compatible with the seat, as the manuals list.
Step 2: For a frame-mounted seat, clamp the bracket to the seat tube at the height the manual gives, clear of cables, and tighten its bolts evenly.
Step 3: For a rack-mounted seat, fit the adapter to the rack and check the rack is rated for the seat plus the child.
Step 4: Slide the seat's mounting tubes into the bracket or lock it onto the rack adapter until it clicks, then fit the safety strap or lock.
Step 5: Fit the footrests at the right height for the child and fit the wheel guards so feet cannot reach the spokes.
Step 6: Adjust the harness to fit the child snugly and check the buckle closes fully.
Step 7: Before carrying the child, ride with the empty seat and then with a weighted bag to get used to the extra weight and the changed balance.
Common mistakes
- Mounting on a rack that is not rated for the seat and the child.
- Skipping the wheel guards, so a child's foot can get caught in the spokes.
- Leaving the harness loose, so the child can slide out.
Safety notes
- The child must always wear a helmet, and the harness must always be done up.
- Never leave a child in the seat while the bike is parked on its stand; the bike can tip over.
- Check the seat, bracket and bolts before every ride.
This is general guidance for this type of product. Your product's own manual comes first: follow its order, fittings and torque values where they differ from this page.
Updated 2026-09-30