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Whats the difference and why would you recommend the m540s over the m520s?
(Other than the fact they're 20 better)
boredom-
Pretty much what @snottyotter said, I got the M540s as it's very much a cheaper version of my old XTR one;
Difference between 540 and 520 is hard to notice when riding, biggest difference is the lockbolt made of metal.
edscoble
Shimano M540, or if you're hurting, the M520.