is it 9/16 U.N.F?
Pedal thread size?
Standard MTB threads are 9/16". A lot of BMX threads are (or certainly were) 1/2".
Not sure about roadies but I think they are 9/16" too.
mtb are 9/16 UNC -20 tpi - left and right threads .
old bmx and kids bike are 1/2 UNC - 20 TPI left and right threads.
9/16 x 20tpi for road and mtb
Left-hand thread on left pedal
9/16" x 20 tpi UN left and right hand.
BS 811:1950: British Standard Cycle threads
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