The ROR truck brake drum 21018963 is designed for heavy-duty applications, particularly for trailers and semi-trailers equipped with ROR or Meritor axles. Here are the key specifications for this brake drum:

Outer Diameter: 311 mm
Braking Surface: 207 mm
Height: 260 mm
Inner Hub Diameter: 183 mm
Bolt Circle Diameter: 225 mm
Number of Stud Holes: 10 (with a hole diameter of 24.5 mm)
This brake drum is commonly used in transport vehicles and ensures reliable braking performance in tough conditions.