Join Date: Jul 2006
Location: Helsinki, Finland
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Originally Posted by Ollyno1uk
This is probably very basic. I have a mountain bike. The try keeps going down.
You might have a piece of glass or other sharp detritus lodged in your tire. Make a note/mark the position of the tire vs. tube, while you are removing it, and find the hole on the tube. That will tell you where in the tire is the sharp object located.
If you can't see the hole in the tube, inflate it a bit and put it uner water, and then see where the bubbles come out of it. If you see no bubbles at first, grope and squeaze it, until you notice bubbles.