i need to fine out which combination of gears is 1st gear and which is 21st gear.
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Its smallest gear. The smaller you get on the front sprocket the lower the gear ratio but if you go higher on the back freewheel the bigger the gear gets meaning faster.
smallest front with largest back = 1st
first means lowest, easiest to pedal, or slowest
it;s a combination
smallest front gear + largest back gear
wle
smallest gear ratio. Think like first gear in a car
on the cassette in back, bigger cog means lower gear. In front the opposite smaller chainring means a lower gear. So the lowest gear is a combination of the biggest cog in back and the smallest in front.
Being it has 21speeds the lowest (1) or slowest gear is when you have the smallest front gear and the largest rear. The highest (21) is when you have the biggest front gear and the smallest rear gear.