Skip to main content
Cranxs Logo
Category

Child Seats

Browse used child seats for sale from riders across the UK. Child seats carry a passenger of roughly 9kg to 22kg on an adult bike, either mounted behind the rider over the rear wheel or in front of the rider on the top tube or head tube, and this category covers both along with the frame brackets and rack adaptors they clamp to. It is aimed at parents adding a seat to an existing bike rather than buying a second family bike.

Buying Guide

What is the difference between a front and rear child seat?

Front seats sit between the rider's arms on a bracket at the head tube and suit children from around 9 months to about three years, or 15kg, and they let you see the child and talk to them. Rear seats take a heavier child, usually to 22kg, and split into rack-mounted models that bolt to a standard pannier rack and frame-mounted models such as the Hamax Caress or Thule Yepp Maxi that clamp to the seat tube on their own sprung arm. Frame-mounted seats flex over bumps and ride more smoothly; rack-mounted seats are cheaper and easier to swap between bikes fitted with compatible racks.

Should I buy a child seat or a trailer?

A seat puts the child's weight high on the bike and changes how it steers at low speed, but it takes seconds to load and nothing extra to store. A trailer sits low, carries two children and shopping, and does not affect balance, at the cost of width on shared paths and a much larger footprint in a shed — the bike accessories section covers both. If your child is under about nine months and cannot hold their head up in a helmet, neither a seat nor a standard trailer is suitable yet.

What should I check on a used child seat?

Look hard at the plastic shell around the mounting points and the leg-guard slots for hairline cracks or crazing, since UV exposure over several summers makes polypropylene brittle. Check the harness webbing for fraying at the buckle and the shoulder-strap slots, test that the crotch buckle clicks firmly and releases only under real pressure, and check the footrest straps are present — they are commonly lost and awkward to replace. On frame-mounted seats, confirm the seller has the correct bracket for the seat: the bracket is model-specific and a seat without one is worth very little. Check the footrests adjust through their full range and the recline mechanism, if fitted, locks in each position.

How much should I pay for a used child seat?

A seat is used for two or three years and then sold, so the market is full of examples with plenty of life left. Expect to pay roughly a third to half of new for a complete seat with bracket and no sun damage; a seat missing its bracket or footrest straps should cost much less because the parts you need to source may be worth more than the seat. Buy new if you cannot verify the seat's age, since manufacturers give a service life for the plastic, or if the model has been discontinued long enough that spare harnesses are hard to find. Also check what the seat needs from the bike before you commit — a rack-mounted seat requires a rack rated for the combined load, which you can source from bag and pannier racks, and mounting a seat over the rear wheel usually rules out using panniers on the same side.