37 a) A tyre tube with a pinhole is first filled with oxygen to a pressure 30lb/sainch and allowed to leak out
Then it is filled with N2gas to the same pressure and allowed to leak out again in which case, the
time taken will be more & why?
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Answers
Answer:
Punctures are an inevitable part of cycling, so you need to know how to fix them. This is a lot easier if you carry spare inner tubes and a puncture repair kit (patches, sandpaper and rubber solution), a couple of tyre levers and a pump on every ride.
Find the puncture
Contrary to popular belief, you don’t need to take the wheel off your bike – or even the tyre completely off the wheel – to fix a puncture.
First, you need to get the punctured tube out of the tyre. Flip the bike, grab your tyre levers and hook the first one under the bead of tyre. Push down to lever the tyre over the edge of the rim. Take the second tyre lever and do the same about 15cm away. This should allow you to slide one of the tyre levers around the rim, popping out the rest of the tyre edge. If not, use a third tyre lever.
Answer:
If you want to save time and money, it is recommended that you learn to change your own inner tubes. It is also advisable that you make sure you have plenty of spare inner tubes in case of emergencies or if you are not within a reasonable distance of a bike store to get it repaired. (I recommend these ones and Amazon has them for a good price normally)
Most inner tubes are made from rubber and inflate with air, therefore, anything sharp, including thorns, glass, rocks or nails, can cause damage to the inner tube and allow the air to leak out.
Depending on the severity of the damage, your tire may deflate rapidly or slowly over time; either way, you will not be able to ride on a deflated tire without causing serious damage to your rim and or tire, potentially costing you a fortune to repair or replace in the future.