Bicycle Mechanics - Kevlar beaded road tyres develop an "S"

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Mzungu
12-11-02, 07:05 AM
On my road bike I have been using Vittoria Courier Clinchers for several sets and am happy.

Today after a ride i was riding slowly home and suddenly noticed a "bump" in the ride and lo and behold the tyre has a slight "S" in one part of the tyre but enough to make it rub. I had put in my normal 100psi in the morning after changing the tube as the valve was leaking. One of the guys said I must of rode through some diesel?

Anyone seen this before?

I just had a thought, could my floor pump gauge be really offf?

Slightly crooked,

Erik

VegasCyclist
12-11-02, 06:05 PM
an 's'? if there is a bulge on the tire, you might want to check and make sure the bead is not coming out of the rim in this area, which would create a bulge, probably because the tube is not fully inside the tire, and it pushing against the wires... but I'm not exactly sure what you mean by 's'
Mzungu
12-11-02, 09:49 PM
Originally posted by VegasCyclist
an 's'? if there is a bulge on the tire, you might want to check and make sure the bead is not coming out of the rim in this area, which would create a bulge, probably because the tube is not fully inside the tire, and it pushing against the wires... but I'm not exactly sure what you mean by 's'

THe bead was properly set. there is a bulge on each side but not opposite of each other, so it looks like a slight "s". It isn't like a bulge but the tire moves to one side or the other but not like it has rolled to the side but like the tyre was malformed, which can't be becuase it has 1000km already. Even deflated i see the tyre isn't straight anymore. the bead seems okay but it is like the kevlar plys have let go. Inside it looks fine.

I guess no one has seen this.

Erik

chewa
12-12-02, 05:05 AM
I sometimes get this on normal beaded tyres, when the bead doesn't fit evenly all the way round. The low spot causes a distinct wobble
D*Alex
12-12-02, 05:41 AM
You broke a belt in the carcass.
Throw it away.
Get a new tyre.
Mzungu
12-12-02, 06:47 AM
Originally posted by D*Alex
You broke a belt in the carcass.
Throw it away.
Get a new tyre.

Thanks Alex. What i really need to know is it something that happens in all tyres or should i look for another brand?