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That setting is there if you change your tire size iirc, so range is rather limited. If the DU is programed for like 27.5"x2.4", you're not going to be able to adjust it for a 20" wheel bike for example.
JVBulman-
In practice it basically has no effect on the assistance and top speed (guys that were repairing my DUnits said so)- but may have an impact on other metrics?
The one little hack they said you could do with gen2 is put it in emtb mode and set the crank length to 165mm or shorter. The DU gives you a little extra torque to compensate for the short crank
MCamb
Wait what? Some model displays have the option to set the wheel size, the motor just ignores this?