Yepp Nexxt Maxi frame mount rear childseatLightweight and safe rear frame mounted child bike seat with a contemporary design, providing premium comfort for your child. A fresh, modern design for the Nexxt generation of child seats Combination of a hard outer shell with plush padding offers great protection and comfort for your passenger Frame mount version, clamps to round seat tubes from 28 40 mm in diameter and can be secured to the bike using a standard Thule lock barrel Highly adjustable