They fit for single speed kids bike. Package includes: 2 x Bolts 2 x Big Screw washers 2 x Training Wheels 2 x Support rod 4 x Small Screw Washers 2 x Locking Nuts 2 x Limit SpacerSpecification: Dimensions: 8.7X4.2X1 inch Wheels Material: plastic Wheels Diameter: 3.3 inch Wheels Thickness: 0.75 inch Brackets length: 7.2inch Brackets Thickness: 0.1inch Flash Training Wheels for 12 14 16 18 20 Inch Kids Bike,Heavy Duty Training Wheels for Single Speed Bicycle ; Material. Carbon Steel ; Pitch Circle Diameter. 4.33... High carbon steel bearing After optimization, the double high carbon steel bearing of our training wheel has been tested to be silent and smooth, with longer wheel life. Kids Bike Training Wheels Flash Mute Wheel for 12 14 16 18 The Keyence FU-E40 fiber optic sensor is a high-precision measurement device that offers several advantages such as fiber optic technology, wide detection range, and robust design They are sturdy and durable which can keep bycicle beginner stable and help child learn to ride a bike without fear. Larger Washer We have specially enlarged the washer so that it can cover the whole bearing nicely. Training Wheels For 16 Inch Bike PUNUS Flash BIKE Taining Wheels Fo 14 16 18 20 Inch Bike With Training Wheels Stability and Safety We made our heavy duty training wheels with special attention to stability, The vertical Bracket arms design are thicker , They Support Riders up to 100 Pounds . Children definitely love the lights that can give them a beautiful world of children. Easy to install ：We offer complete installation accessories. (Tips: A few bicycle axles less than 0.8 inches will not fit) Meanwhile, thicker wheel with 3cm thickness . Single Speed Bike only Training wheels is suitable for 12 14 16 18 20 Single Speed Bike, but not for certain HUFFY bicycles. OurTraining Wheels are made of high-quality steel which can bear heavy children without security problems. Universal Diameter and Available Size:The training wheels can excellently meet your needs to mount it on single-speed bikes from 12-20 inches with horizontal rearward-facing track fork end, but not suitable for those with semi-horizontal or vertical dropouts. Thickened Wheel with Quality PVC Material This training wheel made of quality PVC material from PRUNUS just fits that bill. Security and Stability：These bicycle training wheels are made of high quality plastic and PVC which it is anti-slip, wear resistant, providing stability
