I am thinking of upgrading the chainwheel/cranks/bottom bracket of my Swift but retaining the 8 speed SRAM derailleur. If anyone else has done this how did you get on? What BB make and length did you use and what make of chainwheel/crank did you fit and how did it affect the chainline etc. First I will need to either take a body building course or down some steroids to remove the old BB - is the thing welded in?!!