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20" Decimal Size Bicycle Tires from Harris Cyclery
(ISO/E.T.R.T.O. 406 mm)

This is the size used on BMX and freestyle bikes.
It is also common on folding bikes, recumbents and trailers.

Sometimes confused with the much less common 451 mm size (20 x 1 1/8", 20 x 1 3/8")

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