Originally Posted by
MudPie
The original bottom bracket (cup and cone style) are basically no longer available so going with a cartridge style is the only practical and cost effective method. (Realize you could easily clean the old BB and replace the ball bearings, but it'll be hard to find spindles or cups/cone for it).
Not so. You can buy cup and spindle bbs for Japanese bikes all over the web, pretty cheap, and also for that Schwinn Super Sport. But you can also buy a UN-26 Shimano cartridge bb on line cheap. When replacing a bb, I almost always go with a UN-26. They cost about $10. Piecing together a cup and spindle bb will cost at least that much, if not more.
But on the other hand, the old cup and spindle bbs are very durable. 90% + of them that I find are OK, just need grease and bearings.
A lot of spindles were asymnetric. So you may need spacers to install it. Measure carefully.
Cups:
http://www.niagaracycle.com/product_...ucts_id=405999
http://www.amazon.com/Pyramid-Bottom.../dp/B0010VZFSK
Spindles:
http://www.niagaracycle.com/product_...ducts_id=10265