Tube replacement

 
applying tape.jpg (5859 bytes) We're missing what should be on the first picture- a very careful look for whatever might have caused the flat.  It's very important that you remove whatever is in the tire or figure out what on the inside surface of the rim might have damaged it (for example, a spoke hole that's become uncovered by a broken our out-of-place rimtape).   In all cases this requires complete removal of the tire & tube from the rim.   The photo on the left shows a new rimtape being applied.
Now take your new tube (or your old patched tube) and inflate it with enough air that it takes shape.  This is so that you can more easily place the tube inside the tire without getting it caught between the edges of the tire bead and the rim. inflatetube.jpg (6761 bytes)
onesideoverrim.jpg (11080 bytes) Next step is to place one side, and only one side, of the tire over the rim. 
Now locate the valve hole and temporarily move the front part of the tire over with your hand so that you can place the tube's valve into the hole (as shown in the picture below). readyforvalve.jpg (11620 bytes)
installingvalve.jpg (9689 bytes) Here we see the tubes valve inserted into the hole in the rim.
Now we bring the tire back up over the tube.  Not shown is the very important procedure of pushing the tube up into the tire all the way around the rim, without pushing either the tire or tube over the rim.  The thing to keep in mind here is that we do everything one step at a time tubevalveinsidetire.jpg (11236 bytes)
onesideoverwholedetail.jpg (11053 bytes) Here we've slid the tube down over the top of the rim, but have not slid the second side of the tire down over the rim yet.
The fun begins!  Starting at the valve hold, and moving away from it in both directions, move the second side of the tire up over the rim.  When you get about as far as is shown here, make sure the tire isn't causing the valve to bind- you do this by pushing up on the valve from the bottom, making sure that it moves freely. finalsidebegin.jpg (13056 bytes)
finalsidemiddle.jpg (15621 bytes) We're gradually moving down around the wheel, getting that second side of the tire over the rim.  Because we have some air in the tube so it has a shape, we're not likely to trap it between the tire and rim (a major cause of tubes damaged during installation).

And yes, it is beginning to get a bit tougher as we head towards the home stretch!
Here's a secret that will help get a stubborn tire on!  When you're about 3/4 finished, go around the wheel and squeeze the tire inwards from the sides.  This helps move the tire into the bottom part of the rim, which will free up some much-needed slack so that the final part goes on more easily.  squeezetogether.jpg (10677 bytes)
gettingtough.jpg (13677 bytes) This is as far as your thumbs will safely take you!  That's right, you do not use your thumbs to get the last part of the tire over the rim...unless, of course, you're trying to remove your fingerprint by tearing off skin!  It will be much easier if you roll the last part of the tire over the rim with your palms!  Your palms are much tougher than your thumbs.
And now, for the finale, work the last part of the tire over the rim using your palms.   Slowly work inwards just a little bit at a time and it will be much easier than you think. Note that we aren't using tire tools for this...you should virtually never have to use tire tools to install a tire, but frequently need to when you're removing one.

If the tire's a tight fit, you may need to release the small amount of air you put into the tube.
done.jpg (15562 bytes)

Now you're ready to check your work.  Check once more to make sure the valve moves freely, and then check the tire, one side at a time, and look for any visual evidence of the tube poking out underneath the tire.  Once you're sure everything's fine, pump it up to about 1/3 normal pressure and check for any high spots, an indication that the tire is trying to leave the rim.  If so, let the air back out and try to figure out if the tube is trapped between the rim and tire bead, or maybe you just need to re-seat the tire more evenly so the tire bead grabs on the lip of the rim better.

If all is OK, inflate to full rated pressure and you're back in business!
 

[ Home ] [ Forum] [ Racing ] [ Product ] [ Map ] [ Links ] [ Profile ] [ Tips ]

Copyright 2000-2007,  Champion Bicycle Sales and Service Ltd. All rights reserved