What bearings for bicycle Trax TR1?

I have a bicycle TRAX TR1 and I would like to replace the bearings in the crank.
I am not sure what size of bearings are there?
Could anyone give me some help in it?
Thank you in advance
https://drive.google.com/file/d/0B9omcSPPBKJ2WUlyc21UOHpQakk/view?usp=sharing
https://drive.google.com/file/d/0B9omcSPPBKJ2MGI2R3NRYzhlMVE/view?usp=sharing
https://drive.google.com/file/d/0B9omcSPPBKJ2dkU4SEE0bTByVFk/view?usp=sharing
I am not sure what size of bearings are there?
Could anyone give me some help in it?
Thank you in advance
https://drive.google.com/file/d/0B9omcSPPBKJ2WUlyc21UOHpQakk/view?usp=sharing
https://drive.google.com/file/d/0B9omcSPPBKJ2MGI2R3NRYzhlMVE/view?usp=sharing
https://drive.google.com/file/d/0B9omcSPPBKJ2dkU4SEE0bTByVFk/view?usp=sharing
0
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retired 9.6kg Carrera Kraken
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Would that below be OK?
http://www.ebay.co.uk/itm/Mountain-Bike-Bottom-Backet-axle-Crank-axle-Cycle-Bike-Bearings-1-4-STD-/251510390186?hash=item3a8f2ffdaa:g:56UAAMXQyY1TU9Fg
Only thing is open it up and see what's inside.
As Rookie said, best to replace the BB. But you'll need the right axle size for your crankset.
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