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yah my friend just got a black market mtb and it has gears on it is there anyway to switch it to a single speed with like a normal ratio?

whole bike for sale except forks my friend has a Black Market mtb frame tt is 21.5 pro taper bars sun rims ryno light and ditch witch avid disk brakes front and rear e thirteen sprocekt and guard Shimano cranks S&m 101 pedals shimano deore hubs sram 9 speed gear shimano derailer email jcwpp88@aol.com for pics or questions price offer...