The 742 training wheels feature three slots on the brace arm allowing this wheel set to mount on most single speed bicycles with 16 to 26 inches wheels. The brace Amazon.com : Royalbaby RB12B-6B BMX Freestyle Kids Bike, Boy’s Bikes and Girl’s Bikes with training wheels, Gifts for children, 12 inch wheels, Blue : Childrens Older 26 Inch Tire Sizes. Older bicycles built prior to the 1990’s use 26″ tires that are not the same size as modern 26″ MTB and hybrid bike tires. .
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