Hostile is proud to offer 2 types of molded
foam inserts. Our premium quality standard
foam inserts and a revolutionary new concept
of zero-growth inserts.
Zero growth inserts offer more than just
what the name implies. The goal was to
create an insert that does not grow and
stretch at high speed. This reduces tire
growth and allows the tires to maintain
their profile without a loss of traction
from reduced contact patch as the tire grows
and the profile thins. This allows for more
consistent handling. As an added bonus, the
zero-growth inserts do not require gluing to
the wheel allowing for endless insert
changes as conditions change. This is a must
have for the serious racer or hobbyist.
Our standard foam inserts allow for some
growth. This growth can be beneficial for
added speed as the tire grows and creates a
taller ride height when driving through
rough terrain at speed. Our standard inserts
are also a very economical option for high
quality replacement inserts.
Hostile Racing Products molded foam inserts
offer the best of new technology and are
proudly made 100% in the USA.
TThe foam inserts in
these vehicles act in a similar manner as
the supporting air in a pneumatic tire. For
this reason we can use similar logic when
choosing an insert.
A softer insert will allow for a greater
contact area between the tire and the
running surface generating a greater amount
A firmer insert will resist compression
thereby reducing the contact area, but with
less sidewall flex and less growth from
rotational speed. The terrain will help
dictate the insert choice.
A basic guideline: Soft inserts for firm
surfaces and firm inserts for soft surfaces.
However, there are exceptions to every rule.
For example, lower tire pressures (softer
inserts) will aid in tire flotation when
running on sand or snow while higher tire
pressures (firmer insert) will hold the
surface better on a firm, high traction
Red ring - HARD compound
Blue ring - SOFT compound