Generally you can calculate the perimeter
of a wheel from the diameter (which is
usually written on the wheel) with the
following formula:
Perimeter = Diameter x 3,14
To use the In-Line Skate Speedometer
with worn wheels:
You can easily use the In-Line Skate Speedo-
meter with a used set of other skate wheels.
Most skate brands allow the “rockering”
of the skate wheels. This feature it meant
to assemble wheels of different sizes into
one frame. You can determine the ability
of your skates by dismantling one wheel.
When taking out the axle you can see a
small plastic or metal part called “washer”
with the hole for the axle. This hole is not
in the centre of the washer so it depends
on the installation of the washer at which
height the axle is built into the frame.
If your In-Line Skate Speedometer Wheel
is bigger than the others you will have to
built in the axle closer to the boot. If your
Skate Speedometer Wheel is smaller, the
axle should be closer to the ground.
The In-Line Skate Speedometer is equipped
with an automatic wear out function. The
computer takes into account the reduction
of the wheel perimeter over time. This
guarantees the accuracy of the measure-
ment even if the wheels are already used.
To determine the perimeter of new wheels
use the following list to help you to find
the perimeter of your wheel.
Ø 76 mm <=> PM 239 mm
Ø 78 mm <=> PM 245 mm
Ø 80 mm <=> PM 251 mm
Attention: The perimeter programmed into
the display always has to correspond to the
In-Line Skate Speedometer Wheel (the
wheel size is printed on the packaging). The
display in the packaging is preset to a 239
mm perimeter corresponding to a 76 mm
diameter wheel. If you have bought your
speedometer with a different wheel you
have to adjust the perimeter in the Pro-
gramming-Mode before you start skating.
Microsport_Basic_11/02 11.11.2002 15:16 Uhr Seite 61
