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Specification: Material: plastic / steel Color: Black/White /Red/Blue/Yellow Wheel diameter: approx 11cm / 4.33 inch Fits 12/ 14/ 16/ 18/ 20 inch children's bicycles Made of high quality material, for extra stability and safety Sturdy wheels keep beginners stable, help child learn to ride a bike without fear Generally, the training wheels should slightly higher than the rear wheel about 0.5-1cm, and about 0.5cm from the ground Comes with fittings, easy to assemble Package includes: 2 x Stable jockey wheel for bicycles from 12 "- 20" mounting material INSTALLATION NOTES: 1.Insert bolt through the wheel, washer and training wheel arm. 2.Attach and tighten washer and nut, you will require two wrenches to tighten this property. 3.Remove rear axle nut from the bicycle wheel. 4.Insert axle though locking brace and fix the raised point to the bicycle frame ends 5.Determine desired height of training wheels when attached the training wheels should have about 0.5-1cm (1/5 to 3/5in) space from the ground. 6.Tighten axle nut with adjustable wrench