Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Bikes: Cheltenham-Pederson 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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No problem at all, only a racer need even consider the minute effect on running friction.
I would re-evaluate the bearing adjustment every thousand miles or so, but these will likely be fine for the next good long time.
I bought a Raleigh SuperCourse new in 1976 or so, and one pedal's bearing cone had a pit or two in it when I investigated a bit of roughness when I got home. The shop wouldn't offer any compensation at all because I had disassembled it, so I rode it, even toured on it, for several years after, with the pitted cone still in there.
Of significant concern when rebuilding pedals is whether the locknuts are good and tight against the cones.
Especially on the left pedal, any lack of tightness might have the cone trying to tighten itself against the bearings, which I see occasionally on pedals that are on older bikes.