Quote:
Originally Posted by MrSavvy
............After all of this, I just took the bike to Street and Trail to have them mount and balance the tires, double check the front alignment (on the fork/wheel/triple).
.........The problem I have is this constant, very rapid bouncing on the front-end. The mirrors bounce up and down by a milimeter or so, my arms vibrate a bit, etc...
It doesn't get better or worse with speed changes (as far as I can tell), or with baking.............
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It seems to me that the perimeter of the tire is not concentric with the axis of rotation.
Two things may be happening:
- The good: The tire has been improperly installed and the beads are not seated all around. That is easy to spot, as the tire has a fine line on both sides that should keep a constant distant from the edge of the rim (around 1/4 inch).
.
- The bad: The rim has been deformed radially during the accident. That is more difficult to spot, requiring a measuring process similar to the one for spike wheels:
http://www.dansmc.com/spokewheels.htm
The dial-gauge is not really necessary; a sharp tool fixed to the forks while the wheel turns freely will suffice.
Of course, you will need to keep the front end up in the air somehow.