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Bike Sense Fun 24v - first upgrade K7 sunrace 11-40 8v with Altus Shimano derailleur and 2v crankset. New upgrade K7 12v Absolute 11-50 with 32T teeth chainring + Shimano Deore derailleur Video of the old upgrade 8v - 11-40 • k7 Sunrace 11x40 - 8v crankset abso...