Bike Fault?

Right i am new to the forum so if i have put it in the wrong section please move it!
Right i have a old grit rhino bike(only cost about 100)had it like 8 years,anyway i ride to work on it every day,but the problem is,when im going up hill and put pressure on the pedal the pedal just slips so i cant ride it proply and something happens to the chain,and its like this in nearly every gear,does anyone know what this might be at all?
Many thanks,Jace
Right i have a old grit rhino bike(only cost about 100)had it like 8 years,anyway i ride to work on it every day,but the problem is,when im going up hill and put pressure on the pedal the pedal just slips so i cant ride it proply and something happens to the chain,and its like this in nearly every gear,does anyone know what this might be at all?
Many thanks,Jace
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Posts
New cassette, chain & chainrings required. Might be (financially) better off buying a new bike.
will be looking at getting a mtb!
Steve C