EVO 5-9/Genesis Brake Rotor Hubcentric Rings

These are used to centre either EVO 5-9 or Hyundai Genesis brake rotors on the hub of your DSM. Their function is very similar to the hubcentric rings used for aftermarket rims--the idea is that the brake rotor (or rim) is supposed to be supported by the centrebore, NOT the wheel stud holes. Wheel studs were never designed to support the weight of the vehicle, the hub's centre protrusion is designed for this purpose.

Hubcentric rings MAY be required with EVO 5-9 or Genesis rotors IF the bearing hub protrusion on your DSM is 67.1mm.

The hub protrusion where the rotor rests (the surface closest to the perpendicular flange where the wheel studs are located):

• if this area measures 69.1mm in diameter, you do NOT need hubcentric rings
• if this area measures 67.1mm in diameter, you DO need hubcentric rings

Hubcentric rings are required if the hub protrusion is 67.1mm in diameter.  This is because the centrebore on the EVO 5-9 and Genesis rotors is 69.1mm and the hubcentric rings are required to fill the "gap" between the ID of the rotor's centrebore and the OD of the hub protrusion. We STRONGLY recommend use of hubcentric rings (whether these or some other) to mount these rotors to the hub of a DSM (with a hub protrusion of 67.1mm) otherwise, the rotor will not necessarily rotate in a true circle, but rather, in some sort of elliptical shape. (This is possible because the bolt holes are "clearanced" for the wheel studs and thus are quite a bit larger than the studs themselves. This "allows" the rotor to shift up and down between the wheel studs. As you can imagine, this is not desireable. These hubcentric rings prevent this type of movement.

These units are CNC machined to exact dimensions to ensure a proper fit. Unlike those cheap plastic pieces that seem to inevitably crack and distort, these are made the proper way--from aluminum.

PLEASE NOTE:  Sometime around 1995/96, Mitsu upgraded the wheel hubs and brakes on the Evolution to larger, more robust units.  The result was a beefier wheel hub centre protrusion (69.1mm from 67.1mm).  Of course, the rotor centrebore was enlarged to 69.1mm to match.  In addition, Mitsu decided to keep the rim centrebore at the previous 67.1mm.  This meant that the hub protrusion was required to have a "step": a 69.1mm inboard portion (to accommodate the rotor) and a 67.1mm outboard portion (to accommodate the rim).  All three of these parts (hub, rotor, rim) centrebore sizes used by the Evolution were duplicated in the DSM (presumably to simplify production). The exact build date of the sizing change is unknown.  What does all this mean?  As far as DSMs are concerned, it means there are two styles of wheel hub out there: "early" 2g with a 67.1mm protrusion along its entire width (which we'll call an "unstepped" hub) and "later" 2g with a 67.1mm portion and 69.1mm portion (which we'll call a "stepped" hub).  Further complicating matters is that aftermarket manufacturers duplicated both styles of hubs (probably unsure why the two styles existed, but duplicated the specs in any case).

In summary:
There are 2g DSMs out there that have "stepped" wheel hubs or "unstepped" wheel hubs or a combination of the two.  What any particular 2g DSM has is dependant on several factors (such as the origin of the hub (OEM or aftermarket) the production batch of the hub, etc, etc).  As far as we know, all 1g DSM have the "unstepped" 67.1mm hub protrusions.  There are examples of stepped and unstepped hubs in our detailed images.

Nominal Specs of Hubcentric Rings:
69.1mm OD, 67.1mm ID

NOTE: There are several photos in the detailed images of the various hubs showing wheel hubs with stepped and unstepped hub protrusions.