Upper and lower stop, cable tension: That's the whole wizardry of gear shift adjustment and (almost) only these three parameters need to be set to ensure that the gears are correct. So much for the theory: because if a layman wants to adjust the shifter, it's still a matter for the station. Which screw does what? A derailleur like this is by no means self-explanatory.

Here tune brings (laser) light into the darkness: The tool "Linientreu" is inserted into the fixing bolt of the rear derailleur. A line laser with permanent red markings reliably indicates whether the stops - i.e. the pivot limits of the rear derailleur - correspond to the largest and smallest sprocket on the cassette. You can also check whether the dropout is straight and whether the cable tension is correct. This works perfectly, and the high manufacturing quality typical of tune with a high proportion of milled and anodized aluminium is a pleasure to use.

The effective adjustment work remains, however: The user must know which turn of the rear derailleur has which effect. This learning process is made much easier by the laser display.

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