SIGMA ROX 8.1 - Manual (Page 50)

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5 DEScRIpTIOn OF FUncTIOnS
(functions shown during the ride)
This is a separate distance counter (either distance + or distance -).
This distance counter allows an interval training or a trip according to
a Roadbook. It is pre-programmable and can be changed from + to -
without having to go into the main settings.
Optimization of the gear shift
Expansion denotes the distance traveled by a bike by a turn of the crank.
If you are riding with a high expansion and low cadence, you are riding
with enhanced force at this moment. In contrast if you are riding with a
low expansion and high cadence, you are riding with enhanced frequency
at this moment.
This information can help you use your power optimally on a slope.
The current expansion is intended for the optimization of the gear shift
operation while driving or for the provision of dual transmission.
5.2 BIcyclE FUncTIOnS