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For quadriplegics, or people with limited
finger function, a Tetra Clip is available to
operate the quick release axle lock. The Tetra
Clip is a plastic box which is screwed onto the
drive wheel hub and operated via a push-
through pin. The pin has a red marking on one
side (quick release axle opened) and a green
marking on the other side (quick release axle
locked). The pin can be pushed using the ball
of your hand in the direction of the middle of
the drive wheel and thereby the quick release
axle opened or closed.
Green marking = drive wheel is
locked in place on the product
Figure 58: Tetra Clip with locked quick release axle
Red marking = drive
wheel can be removed
Figure 59: Tetra Clip with opened quick release
axle, drive wheel can be removed
22.2 Checking and adjusting the wheel
tracking of the drive wheel
Well adjusted wheel tracking significantly
improves the easy running characteristics of
the product. To check the tracking, proceed as
follows:
27
Operating instructions SPEEDY F4 & F2
Position the product on a level surface and
secure the product against rolling away.
Measure the axle heights (from the ground to
the drive wheel axle) and write this dimension
onto both tyres at front and back.
Drawing the axle height onto tyres
Figure 60: Drawing the axle height on the front and
back of both tyres
Afterwards measure the distance between the
drive wheels front and back at the height of the
axles along the markers. Ideally, the distance
between the two drive wheels should be the
same size at the front and back. In general it
can be said that the distance between the drive
wheels at the front may not be larger than at
the back. Apart from that, the distance at the
back may not be more than 5 mm larger that at
the front. If this is not the case, the wheel
tracking needs to be corrected.
Distance
Markings
Figure 61: Distance between the markers on the
tyres (at axle height), back
Axle height
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