Technically, by viewing the chart of the torque vs speed, one can tell when to upshift ot downshift the gears. You can see some gear ratios "merge" at some RPM band.
But, practically, as a biker for the past 10 years, I can tell , it comes only by "feel". Hope you understand what that "feel" means
. You cannot see the tachometer all the time while shifting on a busy road. Of course, it is very dangerous too. So, try to learn by experience and you will master the gear shifting.




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