3 sets of holes for mounting this Drum to a Hub or Wheel
3 & 4 hole on a 3.75″ diameter bolt circle
and 4 hole on a 3.228 bolt circle to match the mini-hub.
The flange has a 6-hole 5.25" Bolt circle for mounting a Sprocket
Flanged drum has 6 holes on a 5-1/4″ bolt circle. Machined either “ID” for drum brakes or “OD” for band brakes. All drums have three sets of mounting holes: 3 and 4 hole on a 3.75″ diameter bolt circle and a 4 hole on a 3.228″ bolt circle to match the mini-hub.
