I have read the exhaustive discussion which followed Randy Webb's review of the Alta Crank Pulley, but have not seen much feedback from actual users of the 15% reduction SC pulley and 2% plus lightweight crank pulley. Anyone with before/after 0-60 or quarter mile times? Any other "empirical" data? Any other positive or negative comments from those who are actually using this set-up?

 

Do a search. There is one thread here with one person having a problem with it loose or something. Also read what Randy says on his website and the threads there