Whether the child's bicycle chain cover covers the outer surfaces and edges of chains, sprockets, flywheels, and the inner surface of the chain and sprocket meshing areas. If these areas are not covered, the child's fingers can reach into the touch and it is possible to scratch. Children's fingers cause injury. Whether the size of the bike's brake lever is suitable for your child, if it is not suitable, it may cause the child to hold the brakes tightly, and it is prone to accidents when the bicycle is not braked while riding. Whether the sleeve and the horizontal tube are tightly connected (standard requirements can withstand a pull-out force of 70N), generally the handle can be twisted to feel whether there is relative rotation between the sleeve and the cross tube. If the combination is not tight, when a child rides a bicycle, accidents may occur because the slippery grip is difficult to handle. (Buy baby stroller, baby carriage wholesale, sales, find China Baby Vehicle Industry Network /, Tel 0551-82363313) Pure Water Wipes,Natural Cleaning Wipes,Pure Water Wet Wipes,Pure Water Wipes For Babies Shandong Tianzige International Trade Co., Ltd , https://www.tianzigedipers.com