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Bartroll
@Bartroll Um, not sure about that gearing @Thuekr recommended here.
53x16 might be ok for a 200m standing start - but I would probably go a bit bigger (50x15). Really odd format for a qualifier though - you sure it won't be a flying 200m (that is normal).
53x14 (~100") for a sprint event is a BIG gear for someone who is 65kg and not a sprinter. I am a 90kg sprinter and I rarely race on anything bigger than 96" unless it's a flying 200m, keirin or a kilo. Leg speed is key here, riding a big gear won't help. 50x14 might be a better option
Using 53x15 (~92) for the other events should be fine.
Caveat - gearing is intensely personal. Really what you should do is look at what your desired cadence range will be (I'd imagine 90-95rpm if you don't race track often), look at what speed you expect to ride and pick a gear accordingly. If you know the surface is going to be bad, you might want to gear down a bit.