Rear rotors

[kornholio]

I just got my shipment of rear rotors from mazda. It seems like they eliminated the holes for the rotor screws, are these screws necessary? I have the 5 holes for the lug nuts 1 bigger hole which i assume is for the adjustment screw of the parking brake and a small threaded hole which i really don't know what it is for. Any help would be greatly appreciated.

 

[Lindyrect]

The screws are not necessary. The 5 lugs and caliper hold the rotor on.

 

[brandini]

The hole could have had 2 uses:
1) to hold the rotor flush during assembly as it travels down the line
2) to allow for a bolt to be inserted to help coax the rotor off during removal (like a drum brake has)

Either way you'll be fine without it.

 

[kornholio]

Thanks for the input. I will check on the weekend to see if these are the same size. I spoke to the mazda internet sales dept and i was told that these rotors went through 4 design changes since 2007. Any reason why they would go through so many changes in design?

 

[brandini]

It could be anything from sizing, to vent design, to material choice. None of which you'd probably notice a difference of.

Stop worrying!