At what age can a child sit at the back of a double-seater bicycle? The ones that we find for rent at the parks?

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If your child is younger and you want to let your child to sit with adult bicycle, you can install a child seat behind/in front. The child seat can get easily from neighborhood bicycle shops.

If you're talking about tandem bicycles, it's actually adult sized so your child would have to be tall enough for his feet to touch the ground. Maybe about 10 years old?

thanks