Cycling Gear RATIO ?! 53/21 on the VELODROME ?

I'm thinking about riding this gear ratio 53/21 on the velodrome in san diego. I'm a noob but, hey... I don't really care. Is this too high ? Should I get a lower COG ?

ALSO.... would 53/21 be good on the streets too ? I don't want to constantly change my COG after riding in the velo and then on the streets.

This is for a track bike

Thanks.
 
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