Read the brochure that you probably read before you got the car!
It states (Gen 1 MPS3) F 320mm ventilated & R 280mm solid (Gen 2 details are the same, according to the below website).
For those interested in the comparison, the MPS6 (2005) brochure states F 320mm ventilated & R 314mm solid.
If I'm wrong, blame the brochure(s).
You can't have Googled too hard! In my 1st and only query "Mazda 3 MPS brake disc diameters" I was swamped with answers that all match the figures I have given, including Mazda's own website, see http://www.mazda.com.au/Models/Curre...fications.aspx under the "Chassis" tab.
Gawd!
Last edited by Doug_MPS6; 23-02-2010 at 02:16 PM.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18