bicycle training wheels, variable speed bike training wheels bicycle stabilizers mounted kit for kids variable bike of 18 20 22 inch, 1 pair little world <p>-suitable for children's bicycles of 18"/ 20"/ 22"</p> <p>-it ensures your kids' safety and prevents accidental injuries when learning to ride.</p> <p>-fittings are supplied for easy installment.</p> <p> </p> <p>specification:</p> <p>material:plastic + metal</p> <p>color:silver</p> <p>wheel diameter: approx. 13cm / 5.1 inch </p> <p>bracket size: approx. 21 x 10.5cm / 8.3 x 4.1 inch</p> <p> </p> <p>package included:</p> <p>1 pair training wheels (with fittings)</p> <p> </p> <p>notes:</p> <p>1.please notice that don't make training wheels and rear wheel stand on the ground together, one of the training wheel should be 0.6-1cm higher above the ground.</p> <p>2.the load of 88 lbs or less may be more suitable for the wheels.</p> <p>3.please look carefully to the pictures and make sure if these training wheels can be installed to your bikes.</p> <p>4.some bikes like those one-armed-frame bikes and bikes that rear frame tail hook angle are particularly large are not suitable for this training wheels.</p> <p>5.the width of the frame tube is required within 2.6cm</p> <p> </p> <p> </p> <p>training wheels assembly instructions</p> <p>1.insert bolt though wheel.</p> <p>2.then inset bolt though the wheel and crank.</p> <p>3.attach nut and tighten. you will require two wrenches to tighten this properly.</p> <p>4.remove rear axle nut from bicycle wheel axle.</p> <p>5.center the locking brace on rear wheel axle, then put the crank onto the locking brace.</p> <p>6.determine desired height of training wheels. when attached, the training wheels should have about 6-10 mm(1/4 to 1/8 in)clearance from the ground.</p> <p>7.keep your bicycle vertical with ground, make sure two training wheels vertical with ground too.</p> <p>8.tighten axle nut by adjustable wrench.</p>