Front Tire Bounce

[Larrym]

Centrifugal Force???

So tires can look just fine and be bad.

And when they finally "let go" and show who/what they really are:



They provide the visual evidence we seem to need in order believe in their "badness".

This tire is (was...) on my truck/van/thingy. Ever since I owned the beast there was a "mild disturbance" at highway speeds. Changed both front tires but the symptom persisted. Not enough to shake my fillings in my teeth loose but not that smooth as glass ride I wished was there....

So...after the tire revealed its evilness (on the way to have a pleasant evening with a fine lady of course....) I finally took corrective action.


If you've ever seen how tires are made you'll know that there's the inner tire and the outer tire. Hopefully during the manufacturing process the outer tire will be securely "cemented" to the inner tire all around its circumference.

If not? Then the outer tire section loosely bonded will fly out and away from the inner tire when the tire spins at highway speeds. (Newton and his centrifugal forces...). Just sitting there in the driveway the tire will give no indicators to alert us.

BTW: I did my version of "due diligence" to try and track down the problem. Had all the tires visually inspected by a "professional" as well as looking at them all myself. Also checked the rims for run-out. (P-shaw..just an excuse to dig out my dial indicator and make sure it worked.) All tires were spin balanced as well.

Lucky for me this tire was on the rear and I had dual wheels on each side.

Got a way to spin that front tire at road speed while it's sitting in the driveway? (Improvise?)

HTH

[skids]

At one time, Avon tires were nortorious for tread/carcus separations.

[bikerphil]

An update on this again, swapped my good rim and tire with his, and now his is fine and mine bounces. I'll look into the real problem with the rim/tire this weekend, more to come...

[bikerphil]

Problem solved, turns out it was a bad tire after all. With the tire up on the spin balance stands, it was clearly out of round. Ordered another tire, same kind, mounted and balanced and she rides smooth as a whistle now. Guess the neighbor's kid is going to get a new tire swing for Christmas. Thanks everyone for your replies.

[DGXSER]

Its amazing what all a bad tire can point you toward instead!

Glad you found the issue and got it resolved!!

[fredintoon]

Problem solved, turns out it was a bad tire after all. With the tire up on the spin balance stands, it was clearly out of round. Ordered another tire, same kind, mounted and balanced and she rides smooth as a whistle now. - - - -

Hi Phil,
and that's with the replacement mounted tubeless on a rim with no tubeless stamp on it?
What with that "OK for tubeless" being stamped into the spoke flange and all the other writing being in raised cast lettering, I reckon the only differences between the wheels is there's no clamp bolt holes on the tubeless wheel & the stamping itself.

[bikerphil]

Hi Phil,
and that's with the replacement mounted tubeless on a rim with no tubeless stamp on it?
What with that "OK for tubeless" being stamped into the spoke flange and all the other writing being in raised cast lettering, I reckon the only differences between the wheels is there's no clamp bolt holes on the tubeless wheel & the stamping itself.

Yep, early type rims with no markings running tubeless Shinko 712's. I can not see any differences other than what you mentioned.
I even went all out and installed new Haunachi wheel bearings in the front ($7.80 a pair).