December 22, 2012
Standard issue on older and cheaper Shimano cranks that use an internal bottom bracket rather than external cups.
Same issues that come with all square taper BBs...heavy, a pain to maintenance, and prone to wallowing out the square tapered holes in your crank arms which causes major slop and creaking over time.
If you need a replacement BB for a square taper crank, this isn't a bad choice. It doesn't roll incredibly well but that could be a function of cheap grease or so so bearing quality. There are more expensive options out on the market from companies like Phil Wood but if you really want better performance, ugrade your entire BB to something with external cups and bearings.