Hostile Racing Products is proud to offer axle boots for the HPI
Baja 5B and 5T. These boots offer a unique feature that acts as a shock absorber
in the most critical area when used with the stock HPI drive cups. The front
face of the drive cup is normally cradled inside the boot. When a rock impacts
that area it creates an immediate pinch that often cuts the boot. This shock
absorbing feature allows for most impacts to be absorbed without creating this
pinching that can cut the boots. This feature also fits the re-enforced drive
cups currently available in the aftermarket but does require trimming of the
boot for proper fitment. Photos and details are below.
Tips to ensure the longest life for your axle boots:
1. Sand and round sharp edges on the face of the drive cup to prevent cuts. When
a rock impacts that area, any sharp edges may allow the boot to be cut.
2. Completely grease inside of boot accordions so that they do not create
friction or bind. Your boots will last longer when the accordion area is full of
3. Pull small end of boot toward center of axle. This will be out past the rib
on the HPI axles or the knurling of aftermarket axles. The boots function best
when slightly extended rather than bunched up. The photo below shows the
knurling. Be sure to pull the small end out past the knurling towards the center
of the axle.
4. Please understand that axle boots are subjected to an extreme application.
They are spun at a high rate of speed and backed by metal so that when a rock
hits the boot it creates a pinch with great force that can and will cut any
material used. These boots are made of the highest quality rubber to ensure the
longest life possible for this application, but harsh and rocky conditions will
greatly affect the life of your boots.
5. The black boots
require the use synthetic or silicone based grease.
Petroleum based grease may cause the boots to swell.
6. The gray boots can
be used with petroleum based grease.
6. When running
aftermarket drive cups with a ring or if the boots are rubbing or twisting, you
may need to trim the end of the boots back or clear the inside of the stock hub
carriers to eliminate any rubbing or binding.