Joined: Oct 2011
Posts: 10,053
Likes: 2,508
From: Fairplay Co
Bikes: Current 79 Nishiki Custum Sport, Jeunet 620, notable previous bikes P.K. Ripper loop tail, Kawahara Laser Lite, Paramount Track full chrome, Raliegh Internatioanl, Motobecan Super Mirage. 59 Crown royak 3 speed
The similar cranks I have worked on from that era run 125 or so effective spindle length I believe they spec 125.5 as the charts show. If you running the standard size small chain ring a modern sealed 125 should clear everything and give you a fairly good chain and tread line. If needed you can add 1-2 mm spacing to either side of the BB to adjust some.