Joined: Oct 2011
Posts: 10,043
Likes: 2,505
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
Since it is a new chain and is making noise mainly under load I would suspect that the inner chainring is worn, if this is the case it will likely be noisiest in the low low gear combinations. In a lot of cases a worn chainring will be noisy problematic with some chains but run fine with others.