MTB nearing a year old - next steps/advice

Hi all
I got myself and my missus very basic bikes last summer (a 27.5 Carrera Vulcan and the entry level decathlon with V brakes)
Best thing I have done if I am honest and annoyed for taking so long to actually do it! they are reaching a year on though and wondering what I should check or keep an eye on now we are back out on them. I was using maintenance spray on them throughout the winter, tyres seem okay (from what I can see). Mainly used for trails/sherwood pines or routes around Sheffield, some offroad but we coast along and you will never see us with a gopro on so they get used but not hammered!
What might a total novice like me miss or should I check for, never had a puncture but should I consider changing the inner tubes anyway?
I got myself and my missus very basic bikes last summer (a 27.5 Carrera Vulcan and the entry level decathlon with V brakes)
Best thing I have done if I am honest and annoyed for taking so long to actually do it! they are reaching a year on though and wondering what I should check or keep an eye on now we are back out on them. I was using maintenance spray on them throughout the winter, tyres seem okay (from what I can see). Mainly used for trails/sherwood pines or routes around Sheffield, some offroad but we coast along and you will never see us with a gopro on so they get used but not hammered!
What might a total novice like me miss or should I check for, never had a puncture but should I consider changing the inner tubes anyway?
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Vengeance - http://www.bikeradar.com/forums/viewtopic.php?f=10017&t=12897374&p=19829658&hilit=installed#p19829658
Some of the gear, less than no idea...