127
          
        
        
          3. La madera y sus derivados
        
        
          5. Mechanism
        
        
          ❚❚
        
        
          
            Whenever you use your bike
          
        
        
          ❚
        
        
          •
        
        
          Check the tyres and air
        
        
          
            pressure
          
        
        
          . You might have a flat or a slow leak.
        
        
          ❚
        
        
          •
        
        
          Check your
        
        
          
            brakes
          
        
        
          . They ensure your safety and the safety of other people.
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            lubrication
          
        
        
          of the chains and gears. In wet areas or in summer, these parts can rust or rub, produce
        
        
          friction and eventually break.
        
        
          ❚❚
        
        
          
            Every month, if you use your bike regularly
          
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            cables
          
        
        
          . Are they twisted or broken? Is the tension correct?
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            chain wheels and sprockets
          
        
        
          . Are the teeth in good condition? Does the chain move correctly? Does it
        
        
          jump, slip or rub anywhere? If any of these parts are damaged, you should replace them.
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            air pressure
          
        
        
          of the tyres. The proper pressure is printed on the side of the tyre. You should always carry
        
        
          an air pump and a repair kit.
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            lubrication
          
        
        
          of all the moving
        
        
          parts, including the chain and sprocket
        
        
          mechanisms. You should also lubricate
        
        
          the seat tube, the suspension, the cables
        
        
          or any places where there is friction.
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            suspension
          
        
        
          pressure if
        
        
          you bicycle has got an air or hydraulic
        
        
          suspension system. Are they adjusted
        
        
          correctly for your weight?
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            tyres
          
        
        
          for any cracks, damage
        
        
          or excessive wear.
        
        
          ❚
        
        
          •
        
        
          Check all the
        
        
          
            nuts and bolts
          
        
        
          on your
        
        
          bicycle. Are any of them loose?
        
        
          ❚
        
        
          •
        
        
          Check the
        
        
          
            frame
          
        
        
          of your bicycle. Are
        
        
          there cracks or stress marks on any of
        
        
          the tubes? These problems must be
        
        
          repaired immediately.
        
        
          
            Keep your bicycle clean!
          
        
        
          Dust and dirt cause problems for mechanisms
        
        
          because they cause friction and wear. You should clean your bicycle
        
        
          carefully at least once every three months. After you clean it, you should
        
        
          lubricate the moving parts. If you keep your bicycle in good condition,
        
        
          you will get better use from it for much longer.
        
        
          Which parts of my bicycle do I have to check?
        
        
          45.
        
        
          Which bicycle parts need lubrication? Why is this necessary?
        
        
          Find information about different lubricants for bicycles. Which
        
        
          type is best for each mechanism (brakes, gear wheels, sprockets,
        
        
          chain, axle, handles, etc.)?
        
        
          ADVANCE EDITION