I have spoken with the Kumho Technical center about the extra groove that
appeared in my front tires and received the following reply:
> > The small groove on the centerline of the tire is related to a
> > manufacturing process. When the tread
> > rubber is extruded, a V-shaped groove is included at the
centerline of the
> > tread. This v-groove is used
> > at the tire building machine when the tread is put onto the
tire. A
> > v-shaped roller is used to guide the
> > tread onto the tire carcass. During the curing process of the
tire, this
> > groove may or may not
> > completely close up.
> >
> > What you see is strictly cosmetic and has no effect on the
durability of
> > the tire.
> > Thanks for using Kumho tires!
Makes sense to me.
John Moore
1993 Toyota MR2 NA
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