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General Category >> Technical >> bouncing rear rear tire
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Message started by Tom Nuchols on Dec 22^nd, 2010, 6:23am

Title: bouncing rear rear tire
Post by Tom Nuchols on Dec 22^nd, 2010, 6:23am

I replaced my rear tire on my Giro 2o0 when the old tire wore thru to the tube. The new tire (a Tioga 26X 1.25 has a decided bounce on smooth pavement when I begin to get around 20 mph. I place the bike on the stand and spun the wheel and it is definitely out of round. I used a mm caliper and measured around the tire and found that there is a 1.5 mm difference in the distance from the back of the rim to the top of the tire. I do not notice this on chip and seal for obvious reasons. Has anyone experienced this problem?
Tom Nuchols
Mt Pleasant

Title: Re: bouncing rear rear tire
Post by bob wand on Dec 22^nd, 2010, 4:11pm

Tom,
Take a close look as to how well the tire is seated on the rim.

Title: Re: bouncing rear rear tire
Post by Tom Nuchols on Dec 22^nd, 2010, 7:24pm

I have checked the rim and it seems to be tight all the way around. This is the first thing I though of.
Tom Nuchols

Title: Re: bouncing rear rear tire
Post by FlyingLaZBoy on Dec 24^th, 2010, 8:24am

I've had this happen when changing a tire -- it's probably a problem with how it's seating in the rim. Re-install the tire, checking the "fit" before fully re-inflating - pump it up to ~15psi, and spin it while watching. You can often "thumb-push" the tire into correct alignment at that point. Also check to see if your rim tape has shifted, interfering with the seating.

I had a video posted here on this a couple years ago, but apparently the upload to PHotobucket doesn't exist any more.