G
Gary Young
Guest
I've had a problem with two of the new "Carbon 12" Avocet tires (the
ones with black sidewalls). Both were the 28mm size (measuring a true
28mm) and both having a Kevlar belt.
In both cases, the tread began to "pucker" on the outer edge or edges
of the contact patch. In the first tire, it occured on both sides, as
if two moles had dug tunnels under the rubber in parallel paths around
the circumference of the tire. I don't keep track of mileage, but that
tire was quite worn before the problem appeared. I ultimately retired
the tire because of a sidewall cut unrelated to the puckering.
The second, which was used on the front for most of its life, was not
very worn when the puckering appeared (the seam at the center of the
tread was still visible in spots). In this case, there was only one
mole's tunnel. I retired that tire last weekend because of a hole in
the casing at a point along the tunnel.
I'm guessing that this is caused by the kevlar belt not being glued
down to the casing underneath. When I cut a cross section, I see an
air pocket with some fibers on the top. It could be that just the
rubber is separating and carrying some kevlar fibers with it.
Any ideas about what's going on?
ones with black sidewalls). Both were the 28mm size (measuring a true
28mm) and both having a Kevlar belt.
In both cases, the tread began to "pucker" on the outer edge or edges
of the contact patch. In the first tire, it occured on both sides, as
if two moles had dug tunnels under the rubber in parallel paths around
the circumference of the tire. I don't keep track of mileage, but that
tire was quite worn before the problem appeared. I ultimately retired
the tire because of a sidewall cut unrelated to the puckering.
The second, which was used on the front for most of its life, was not
very worn when the puckering appeared (the seam at the center of the
tread was still visible in spots). In this case, there was only one
mole's tunnel. I retired that tire last weekend because of a hole in
the casing at a point along the tunnel.
I'm guessing that this is caused by the kevlar belt not being glued
down to the casing underneath. When I cut a cross section, I see an
air pocket with some fibers on the top. It could be that just the
rubber is separating and carrying some kevlar fibers with it.
Any ideas about what's going on?