The cause of numbness in the forefinger, middle finger or thumb is an overstretched lateral wrist, which can narrow the carpal tunnel. Similar to a kinked garden hose, through which no more water flows, the nerve information can no longer be transported through the narrowed carpal tunnel. This "bend" is usually caused by a too straight handlebar with too little bend to the rear (backsweep).
Whether MTB handlebars, trekking or bicycle handlebars. Safety comes first. Of course our handlebars meet the DIN norm and much more. With our MTB handlebars 3OX and 11 FL-X we were together with Syntace the only manufacturers who survived the big BIKE Magazin Bruchtest (4/2019) without any damage.