The seat clamps to a round seat post up to 4.5 cm (1.77 in) across, and you need a few centimetres of exposed post above the frame to clamp onto. That covers most hybrids, city bikes, cruisers and hardtail mountain bikes. We don't recommend it for carbon seat posts, dropper posts, or bikes where the post is hidden inside the frame. Not sure? Send a photo of your seat post to hello@frontsie.com and we'll tell you.

Kids who already sit up on their own and can hold on, roughly 2 to 5 years old. The rail is about 33 to 35 cm wide inside, so it's a snug fit for a toddler and gets tight around age 5. You know your kid best; if they're not ready to sit still for a ride, wait a few months.

A foam-wrapped rail wraps around the sides and the front, and the short handlebar gives them something to hold with both hands. Their feet rest on the pegs. There's nothing behind them except you, which is the whole idea: your arms are around them the entire ride. Helmets on, slow and steady, and start with a lap of the driveway.

The seat sits between your arms, so you pedal with your knees a little wider than usual. Most parents stop noticing after the first block. The support arm adjusts from 35 to 43 cm, so you can move the seat forward or back until it feels right for your bike and your reach.

Orders ship within 1 to 5 business days with tracking and arrive in 7 to 21 days depending on where you are. Shipping is free worldwide. The parcel weighs about 3 kg, so it may come by courier rather than in the mailbox.

You have 30 days from delivery for an unused seat in its original box. Write to hello@frontsie.com first and we'll send instructions; return shipping is on you. If a part arrives bent, damaged or missing, send a photo within 48 hours and we'll replace it free of charge. Bent or missing parts within the first 90 days are replaced too.