Originally Posted by
Barabaika
Shimano UN26 is only $8.
+1 this. You're likely to spend as much or more converting it to a cup-and-cone bottom bracket.
Cup and cone bottom brackets have no seals. So, a cartridge-type bottom bracket is much superior.
Not necessarily. Several manufacturers, including Tange, Shimano, and Campagnolo, made cups with neoprene seals that fit tightly around the spindle. When used with an appropriate sleeve inside the shell, they're quite effective at sealing out contamination.
