Device for adjusting the tensioning of a control cable of a bicycle gearshift

A adjustment device for adjusting the tensioning of a control cable of a bicycle gearshift, the device comprising:

• a pair of elements coupled to each other through respective threadings extending along a longitudinal axis, each element of said pair of elements comprising a respective through cavity extending along said longitudinal axis for passage of said cable, wherein:
• a first element of said pair of elements comprises an end portion provided with an outer threading and, at an opposite end portion thereof, a first housing seat for housing an end portion of a first protective sheath of a first length of said cable;
• a second element of said pair of elements comprises a hollow portion provided with an inner threading engaged with said outer threading and, at a free end portion thereof distal from said first element, a second housing seat for housing an end portion of a second protective sheath of a second length of said cable;
• and,
• said adjustment device further comprising a helical spring arranged coaxially to said outer threading and held in a compressed state between a first shoulder defined in said first element and a second shoulder defined in said second element and, at at least one of said first and second shoulders, a plurality of locking grooves for locking a respective free end of said helical spring.