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08 Drive Unit
8.2 Components
Note: Make sure you do not damage the sensor or the sensor holder when
tting or removing the rear wheel. When changing a wheel, make sure that
the sensor cable is routed so that it is not under tension and has no kinks.
The CenterLock magnet (4) can only be removed and reinserted up to 5
times.
Rim magnet
When installing a rim magnet, no sensor is required to detect a wheel
turn. The drive unit itself detects when the magnet is close to it and
calculates the speed and any other data required from the frequency
of the emergence of the magnet eld. Since the drive unit is sensitive to
magnetic elds, avoid other magnetic elds in the vicinity of the drive unit
(e.g. magnetic clipless pedals, magnetic cadence sensors, etc.) in order to
prevent disruption to the drive unit.
(2) Speed sensor
(3) Spoke magnet
Information on the noise emissions of the drive unit.
Typically, the A-weighted noise emission level of the drive unit is < 70
dB(A). A key feature of the <eBike Alarm> service is that the drive unit
will emit an alarm tone in response to unauthorised movement of the
eBike. This alarm tone can exceed a noise emission level of 70 dB(A) and
measures 80 dB(A) at a 2m distance from the drive unit. The alarm tone
is only available once the <eBike Alarm> service has been activated and
can be deactivated via the APP eBike Flow.
Assembly - Checking the speed sensor (see gure A)
The speed sensor (2) and its CenterLock magnet (4) or spoke magnet (3)
are mounted ex-works in such a manner that the magnet, after a turn of
the wheel, moves past the speed sensor with a clearance of at least 2
mm, yet no more than 15 mm (see gure A).
(4) CenterLock magnet
(5) Rim magnet
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