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Old 07-30-2007, 07:50 AM   #39
Scooby Newbie
Member#: 16839
Join Date: Mar 2002
Location: Sydney Australia

Originally Posted by jamal View Post
Thanks, I made the rotor dimensions clickable so they go to those pages. What are the differences between the 4000, 4650, and 650?
650 was the original light weight WRX replacement rotor

4000 - Was developed for production car racing with the 4 pot WRX caliper. (before the USA WRX was released). The 1999 to 2001 WRX had a sintered ABS tone ring mounted on the hub so the mounting bell profile could not be altered to suit the USA caliper. This one is for the rest of the world.

4650 - Is a modified 4000 to suit the 2 pot USA WRX caliper. Only the mounting bell shape is different to clear the support bracket on the USA caliper. Still don't know why Subaru spec'd the two pot caliper.....
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