Originally Posted by ciclista_pazza

I contacted the bike shop (I sent the mechanic a link to this thread) and he said he was mistaken as he said he assumed most vintage Schwinns take 1/2" pedals, and he confirmed you guys are correct that the Le Tour actually takes 9/16" pedals instead of 1/2". So that's good news that I don't need an adapter or replacement crank arms. Thanks for everyone's help in figuring this out!