Joined: Sep 2008
Posts: 1,787
Likes: 350
From: Tepic, Nayarit, Mexico
Bikes: 48 Automoto, 49 Stallard, 50 Rotrax, 62 Jack Taylor, 67 Atala, 68 Lejeune, 72-74-75 Motobecanes, 73 RIH, 71 Zieleman, 74 Raleigh, 78 Windsor, 83 Messina (Villata), 84 Brazzo (Losa), 85 Davidson, 90 Diamondback, 92 Kestrel
Many cottered cranks were produced with a 50.4mm bcd, it was a standard size in the 1940's and 50's. Any of them would be compatible with 49d rings.