Yes - 2 on your left would be your middle ring. When you have a 2 on the left, you should be able to safely use all 7 gears on the right.
Also worth noting for the OP or anyone else shopping for a bike - when a new bike listing says a bike is a '9-speed' or '10-speed' it refers to the number of cogs on the back wheel. So if you see '30/42/52 9-speed', it means that you have three rings up front (small one with 30 teeth, middle one with 42 teeth and large one with 52 teeth) and 9 'rings' (or cogs) in the back giving you the total of 27 theoretical combinations.




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