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Low Tire Pressure
There is low air pressure or none at all.
Inner tube / valve stem is damaged
The inner tube inside a tire can sometimes be damaged without any obvious signs. Air will slowly leak out from the puncture site causing the tire to lose air slowly. Also, when the valve stem is damaged or not sealed properly it can also cause air to slowly leak out. To fix this issue you will need to patch the site or replace the inner tube.
Tire needs air
If a bicycle has not been used in a while air can escape from the inner tube even if the inner tube is in perfect condition. By checking your psi levels weekly you can keep the right level of air in your tire. By using a bicycle pump with a gauge you can check your tire pressure and inflate the tube when needed.
Your brakes provide little or no stopping power when pressed.
Check brake pads
It's likely that the brake pads might need adjusting or replacing. If the brakes tend to favor one side of the tire or the brake pads are center to wide from the tire it can cause brake loss. You can tell if brake pads need replacing if the are worn out which also causes brake loss.
Check brake line
It is possible the the brake lines that goes from the brake pedal to the the brake pads are too loose. It is common for the brake line to become loose overtimes. To correct this issue you must check the line to see if it is hanging low and if so at the end of the line there is a screw you must tighten in order to fix the line.
Chain gets stuck or pops off
While cycling the chain gets stuck or comes off.
With checking the chain there can be many reasons why the chain gets stuck or pops off. Check to see if there are any object obstructing the chain. Next, check the condition of the chain if it is rusted or needs to lubricated. Lastly, check the chain length (having a too short or long of a chain can cause it to get stuck or pop off).
When the derailleur needs adjustments it can cause the gears to be out of whack which causes problems for the chain. This then causes stress on the chain and can cause the chain to be unusable. To fix this you must adjust the derailleur.
Too hard too pedal
It's harder to pedal then it usually is.
It is possible that the wheel has become warped from riding in the heat or needs replacement. With this problem riding the bicycle can become very difficult and dangerous. It is recommended that you replace the wheel to ensure safety.
Chain out of alignment
When the chain does not flow with the gears you selected it can make the bicycle harder to pedal. When a chain is out of alignment it can cause the links to become damaged in which the chain needs to be replaced.
Unnatural feel while pedaling
When pedaling the pedals move around too much.
Pedal may be stripped
If the pedal is stripped it can cause the pedal to wobbly or comes out of its socket. Replace the pedal immediately if you see this as it can cause permanent damage to the crank arm if not fixed.
Crank arm may need to be replaced
If the crank arm feel unnatural it can be from the bracket system associated with the crank arm. The bracket system may need adjustments because of looseness or the cones.