English to Romanian Tech/Engineering Mechanics / Mech Engineering Tractoare pe senile

The XXX roller has a taller flange to improve track guiding, especially in sidesloping applications. Advanced features and reduced piece parts enhance the rollers which help eliminate any flexing in the collars and avoid oil loss.

Este vorba de tractoare pe senile.
Intrebarea mea este: "roller" aici inseamna rulou/rola sau cilindru? Sau daca niciuna din aceste variante nu este cea buna, care este traducerea corecta?
Multumesc anticipat!