OS20 is 22″. OS20 is 20″, but .
There are two wheel sizes under the 20″ category – the 20″ on Jr/mini bikes uses the 451mm diameter wheel in narrow widths (for 20-1/8″ & 20-3/8″ tires), and the conventional 20″ which uses the smaller 406mm diameter wheel but in wider widths. OS20 is 451mm wheel diameter in widths similar to 406mm wheels.
This fork will accommodate a OS 20” Wheel, as well as a 20 x 1 3/8″ wheel, but the fork is built for a Pro size rider and a OS 20″ Tire.
20’’ OS – 20mm front axle

ELEVN Alloy Top Cap & spacers included
(top cap : 15g)

Shipping Weight 1.0000kg
Shipping Width 0.170m
Shipping Height 0.070m
Shipping Length 0.580m

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