Refitting tyre with out pinching the tube.

Discussion in 'Cycling Equipment' started by Gearoid, Aug 23, 2006.

  1. Gearoid

    Gearoid New Member

    Feb 11, 2005
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    Help help, I still after a long time end up pinching the tube when replacing tyre and tube after a flat. Any tips or advice. I have a mtb bike with 519 rims using 1.3 tyres.

  2. RickF

    RickF New Member

    Jul 27, 2005
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    Mountain bikes should be much easier than road bikes. I will start with the basics. If you are doing these and still having problems, then let me know exactly where the problem shows up.

    Inflate the tube just enough to hold its shape.

    Put one bead of the tire on the rim.

    Insert the tube into the tire beginning at the stem and working around. Be sure that all of the tube is within the tire and rim.

    Press the other bead onto the rim, being careful that the tube stays between the two tire beads. This is where road bikes are much more difficult than mountain bikes.

    Inspect both sides of the tire to ensure that the tube is not showing outside of the beads.

    Slowly inflate to a low pressure (about 20 psi for a mountain bike tire).

    Inspect the beads all the way around on both sides to ensure that the bead is seated in the rim and that the tube does not show.

    Inflate the tube to about two-thirds of the final pressure, and repeat the inspection of the beads.

    Inflate the tube the rest of the way.

    If at any point the bead is not seated on the rim or the tube is showing outside of the bead, lower the pressure and push the tube and tire into the proper position. Never inflate more than half-way until you are certain that the bead is seated properly. Never use a tire lever to put the second bead onto the rim. With a mountain bike tire, it is usually easy to press the bead onto the rim with your thumbs. For road bikes (and if the mountain bike tire is not easy to press on) it is best to put the side where the bead is not on the rim away from the body and press the thumbs onto the rim on the side of the bead that is already on the rim and use all eight fingers to pull toe other bead onto the rim.
  3. alfeng

    alfeng Well-Known Member

    Jul 23, 2005
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    Is it possible that you are using a tube that is too large for the tyre?

    If not, then (while similar, this is not quite the same "instructions" as given by RickF):
    • talc the tube before putting it in the tyre
    • put a minimal amount of air in the tube to assist fitting it into the tyre's cavity
    • begin seating the tyre at the valve hole -- arbitrarily, work clockwise
    • with the valve hole @ 3 o'clock & the HALF of the tyre's bead seated, nestle the bead into the trough in the rim
    • fit the remaining bead inside the rim
    • inflate with about 20PSI & check
    If satisfied, inflate & mount the wheel in your bike.

    NB: If your tubes have been SLIMEd, then you need to use corn starch instead of talc BECAUSE talc will prevent the SLIME from coagulating properly.