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

Kids who can sit up on their own and hold on, roughly 2 to 5 years old. The side guards are about 33 cm apart, so it's snug for a toddler and starts to feel tight around 5. You know your kid best. If they're not ready to sit still for a ride yet, give it a few months.

Soft foam guards on both sides at waist height, a short handlebar in front to hold with both hands, and pegs for their feet. Behind them there's you, and your arms stay around them the whole ride. Helmets on, take it slow, and start with a lap of the driveway.

You'll ride 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 slide the seat forward or back until it feels right for your bike.

Orders ship within 1 to 5 business days with tracking and usually arrive in 7 to 21 days, depending on where you live. Shipping is free. The box weighs about 3 kg, so it may come by courier instead of fitting in your mailbox.

You have 30 days from delivery to return an unused seat in its original box. E-mail hello@frontsie.com first and we'll send you the steps. Return shipping is on you. If a part shows up bent, damaged or missing, send us a photo within 48 hours and we'll replace it for free. Bent or missing parts in the first 90 days get replaced too.