Fits 12" (30.5cm) - 20" (50.8cm) tire diameter size child bikes

Adult bike minimum size tire diameter 25" (63.5cm)

Tow bar receiver fits child bikes with head tubes up to 45mm (1.77") wide in diameter and expans for bolting distance of 105mm (4.1") for top and bottom U-bolt spacing.

Fits adult bike seat post diameter 1" (25.4mm) - 1.25" (31.8mm)

For use with children up to 70 pounds (32kg)

Adult rider must weigh at least twice that of the child rider.

Child bike must have rear free wheel capability. (Bike capable of coasting with out pedaling)