Joined: Jan 2010
Posts: 9,813
Likes: 1,790
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Having the posts closer together offers a more-horizontal pad trajectory at the rim, so reduces pad-dive implications especially as the pads wear. My 720 had Shimano MT70 canti's, which worked well with aftermarket pads. Changing to 700c rims increased leverage noticeably, but the narrow post spacing helped prevent pad-dive from becoming an issue with the smaller rims.