Isidambisi somothuko (Vibration Damper) sisetyenziswa ikakhulu ukulawula umothuko xa intwasahlobo iphinda ibuyela emva kokuba ifunxa umothuko kunye neempembelelo zendlela. Xa uqhuba ngendlela engacwangciswanga, nangona ukothuka okufunxa intwasahlobo kuhluza umothuko ovela endleleni, intwasahlobo isaza kuphinda ibuyele emva emva koko i-absorbing yokothuka isetyenziselwa ukulawula ukutsiba kwentwasahlobo. Ukuba i-shock absorber ithambile kakhulu, umzimba wemoto uya kukhwankqisa, kwaye intwasahlobo iya kusebenza ngokungahambi kakuhle kunye nokuchasana okukhulu ukuba kunzima kakhulu.
I-G&W inokubonelela ngeendidi ezimbini ze-shock absorbers ezivela kwizakhiwo ezahlukeneyo: i-mono-tube kunye ne-twin-tube shock absorbers.