Positioning the lever blade angle
To determine the lever blade angle, you must use your own saddle to bar drop (the difference between saddle height and handlebar height). It generally helps to adjust the lever blade until it describes the extended line of the forearm.
The nerves that run through the carpal tunnel affect the thumb, index and middle fingers. A too steep or too flat lever blade angle will lead to a kink in the wrist and a narrowing of the carpal tunnel. This in turn leads to numbness and tingling in the thumb, index finger and middle finger
Reference values for handlebar height & angle of inclination:
> 10 cm Lenkerüberhöhung: 20 - 25°
0 - 10 cm Lenkerüberhöhung: 25 - 30°
0 - 10 cm Sattelüberhöhung: 30 - 35°
> 10 cm Sattelüberhöhung: 35 - 45°