Subject: front front front front end problem end front end problem
Author: John Prusnek
Date: Aug 30, 2002, 5:50 AM
Post ID: 1710911563
Brian:
Based upon my one time experience with this, I'd say that it would. My
front tire started bouncing around 30-35mph, then smoothed out after
that. The tire was perfectly balanced, I even had the balance rechecked;
it was then that I noticed the runout since I was looking for a problem.
It was also at this time that I noticed that the manufacturing date
on the tires was 1971 (!). I figured that it was an old tire that sat
in one place for years and developed a flat spot- I think the bike was
stored for a long time before I got it. I should have noticed the age
and scrapped them in the beginning.
If your front end is bouncing around at speed and the tire's balanced
and the rim is round, what else could it be? I'm no physics major, but
I suspect that there's a bit of force happening at 30mph.
A friend of mine used to work for a tire company, he said that they
would occasionally chuck a mounted tire up in a lathe and trim the
outside to make it round. He was suprised at how much some tires were
out, some to the point that they went down to the casing, scrapped the
tire and started over again.
John Prusnek
| John, My question now is this: would an out-of-round condition of 1/8" be enough to cause this problem? Again, all comments are appreciated. Brian |