Having trouble with the gears on the bike, I have seven cogs on the rear wheel but can not select the two outer most ones. I gave the cables a tighten but once I get to the fifth cog and pull the lever there is no click and doesn't seem to be any more gears to go.
Never done any sort of bike maintenance before so no idea where to start.
Is it likely to be a problem with the gear shift lever or the rear dérailleur, or something else.
Any ideas appreciated.
Oh and the bike uses Shimano Altus A20