I have a 'custom' 24" bmx cruiser. It's been modified into a 'b6er' (26" rear/27.5" front).
For a long time I ran a standard square taper bb and mtn cranks. Recently I got a set of
S&M euro cups and installed my old Redline Flight bmx cranks. Because Redlines bb spindle is proprietary, I had to work with the spacing. As you can see from the picture,
the clearance on the left crank is pretty minimal. The spider is drilled out to 74mm bcd so I could use a 28t front ring.
The problem I'm having is that the euro cups seem to be getting gritty MUCH faster
than a standard mtn bike bb would wear out. I'm not sure what has made them wear out so quickly. When I installed everything I made sure there was no excessive friction so I know the cups were not damaged initially.
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