9/16" spindle for 3 piece cranks. Check out these lovely rat trap repro's from Taiwan! Closest you will find to the West German 'Union' pedals from the 80's.
Pair Sprint 1/2" Rat-Trap bmx or Retro Mountain Bike / Bicycle Pedals - Silver
Grafton Speed Trap Pedals 3dv Immaculate Condition
BMX Childrens Bike Bicycle 140mm One Piece Crank For 1/2" Pedals Chrome Silver
Wellgo Old school BMX XC-II bear trap Bicycle Bike pedals 9/16" MTB BMX 8 Colors
VP Components Bear Trap VP-747F Old School BMX 9/16" Pedals - Black/Silver
BMX 1 Piece Crankset - Chrome - 152mm Crank Length - 1/2" Pedals - Steel
