Jidhka guud ee gaariga wuxuu leeyahay seddex tiir, tii safka hore (safka hore), safka dhexe (b safka hoose), safka dambe (C safaaradda) hore ilaa gadaal. Gawaarida, ka sokow taageerada, tiirka wuxuu kaloo ciyaaraa doorka albaabka albaabka.
Tiirka hore waa kan bidix iyo midig ee midig ee midig ee ku xira saqafka saqafka qolka hore. Tiirka hore wuxuu u dhexeeyaa qolka matoorka iyo korodhka, muraayadaha bidix iyo muraayadaha saxda ah, waxayna horjoogsan doonaan qayb ka mid ah wareeggaaga, gaar ahaan dhanka bidix, sidaa darteed ayaa looga hadlay wax dheeraad ah.
Xagalka ay safka hore ee xargaha aragtida wadaha aragtida waa in sidoo kale la tixgaliyaa marka la tixgelinayo safka hore ee joomatamka hore. Xaaladaha caadiga ah, khadka darawalka ee aragtida hore, xalka hore ee isku-darka guud ahaan waa mid ka wanaagsan safka hore, laakiin sidoo kale inuu yareeyo khafiifinta wadaha ee saamiga ee saamiga, waa dhibaato is khilaafsan. Naqshadeeyuhu waa inuu isku dayaa inuu isu dheellitiro labada si uu u helo natiijooyinka ugu fiican. Saddexdii Sawirka Caalamiga ah ee Waqooyiga ee Sweden, Volvo ee Sweden ayaa bilaabay SCCT The SCC ee ugu dambeysay ee Fikradda ah. Tiirka hore waxaa loo beddelay qaab hufan, oo ku jira galaas hufan si darawalku u arko dunida dibedda ee safka, si meesha indhoolaha ah ee garoonka lagu muujiyey ugu yaraan.
