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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
Whats the difference and why would you recommend the m540s over the m520s?
(Other than the fact they're 20 better)