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
Bullseye Skyway Cage Pedals Chrome and Gold 9/16
USED FIXIE PEDALS-TOWN BIKE OR RAT BIKE
Wellgo Old school BMX XC-II bear trap Bicycle Bike pedals 9/16" MTB BMX 8 Colors
VP Components Bear Trap VP-747F Old Skool BMX 1/2" Pedals For Single Piece Crank
