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In stockcan be shipped within 1 days
8 and 9 speed compatible
Link to Shimano's tech page on the Alivio RD-M430: http://si.shimano.com/php/download.php?file=pdf/ev/EV-RD-M430-3028.pdf
Link to Shimano's tech page on the Sora RD-3300: http://si.shimano.com/php/download.php?file=pdf/ev/EV-RD-3300-A-2539.pdf