Wald's 10252 training wheels are designed to mount on most single speed bicycles with 16- to 20-inch wheels and are intended for use by riders weighing up to 100 pounds. These training wheels feature new frame adapters that improve installation. 5.5" diameter plated steel wheels with rubber tread Made in the USA Designed to mount on most bicycles with 16 to 20" wheel sizes Brace arms fit chainstays up to 1.25" diameters - rubber adaptor for smaller sizes Weight limit: 100lbs