Introduction

If you notice that your bike tire is flat, you probably need to replace your bike tube. This guide will demonstrate the process and steps required to fix a worn out or punctured bike tube on a Trek 800 model bike.

Tools

Parts

Acknowledge that you have a flat tire.
  • Acknowledge that you have a flat tire.

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Note the size of tube needed and optimum tire pressure. It is best to know this ahead of time so you have the information for the later steps.
  • Note the size of tube needed and optimum tire pressure.

  • It is best to know this ahead of time so you have the information for the later steps.

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Start removing the rear tire by disengaging the rear brake. Pinch the arms to compress the brake chord. Pull the chord out of the lever and it will fully release.
  • Start removing the rear tire by disengaging the rear brake.

  • Pinch the arms to compress the brake chord.

  • Pull the chord out of the lever and it will fully release.

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Unscrew quick release lever found where the bike frame is attached to the rim of the tire. Turn the lever then the quick release cap will unscrew "lefty-loosey".
  • Unscrew quick release lever found where the bike frame is attached to the rim of the tire.

  • Turn the lever then the quick release cap will unscrew "lefty-loosey".

  • Once it is loose enough you can pull the tire off.

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Remove chain from sprocket.
  • Remove chain from sprocket.

  • This isn't that hard, just spin the tire slowly to help while taking the chain off.

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Pull tire and rim off of bike. Pinch the tire and separate from rim.
  • Pull tire and rim off of bike.

  • Pinch the tire and separate from rim.

I remember getting the tire off the rim was difficult. There are special levers to help pull off the tire. You use three of them to pull the rim off, inserting one after the other and sliding them to the side.

Nils Faltin - Reply

Pull out punctured tube from tire and replace with new tube
  • Pull out punctured tube from tire and replace with new tube

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Put the tire back on the rim Make sure the hole in the rim lines up with the valve on the tube properly. Make sure the hole in the rim lines up with the valve on the tube properly.
  • Put the tire back on the rim

  • Make sure the hole in the rim lines up with the valve on the tube properly.

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Re-attach rim to the bike frame. Make sure the chain aligns with the sprocket. Make sure the chain aligns with the sprocket.
  • Re-attach rim to the bike frame.

  • Make sure the chain aligns with the sprocket.

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Tighten quick release lever and lock. Tighten quick release lever and lock. Tighten quick release lever and lock.
  • Tighten quick release lever and lock.

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Re-attach the rear brake. Reference step 3 and follow in reverse.
  • Re-attach the rear brake.

  • Reference step 3 and follow in reverse.

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Pump the tire up to the specified pressure This tire is supposed to be at 40 PSI This tire is supposed to be at 40 PSI
  • Pump the tire up to the specified pressure

    • This tire is supposed to be at 40 PSI

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Conclusion

If all of your steps were completed correctly you should be free to ride. Enjoy.

Ryen Simpson

Member since: 02/24/2015

121 Reputation

1 Guide authored

Team

Cal Poly, Team 23-2, Green Winter 2015 Member of Cal Poly, Team 23-2, Green Winter 2015

CPSU-GREEN-W15S23G2

4 Members

4 Guides authored

One Comment

Thanks for providing these instructions. But I think the most difficult step (getting the tire off the rim) should be explained in more detail.

Nils Faltin - Reply

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