Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
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.
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A longer axle still would need the smooth section to mate properly with the ID of both bearings.
Whatever you need a longer axle for, could longer axle nuts possibly substitute for that? I can't imagine the reason though.
These kind of hubs have been around for almost as long as I can remember. They took off in popularity in 1978 when Sansin's cartridge-bearing hubs started getting spec'd, but were also preceeded in the early 1970's by the popular Viscount bike's cartridge-bearing hubs.