'2000 300M: Front rotor thickness?

Discussion in 'Chrysler 300' started by MoPar Man, Nov 30, 2003.

  1. MoPar Man

    MoPar Man Guest

    '2000 300M, 67k km (41.5k miles).

    Just put my snow tires on (Alpin's on front, Blizzak's on back), was
    checking the rotors and pads. Changed front pads about 1.5 years ago
    because of "groaning/creaking" of original pads, so they're still
    good. Changed rear pads (probably still 1/2 the pad left but what the
    hell.) Boy they're small. Still looking for something to cover the
    center hubs.

    Measured the front rotors - both at 1.02". What is the original
    thickness? (I looked but couldn't find any numbers stamped on them
    other than a 5 or 6-digit part number.) This is non-PHP. Rear rotors
    had lots of text stamped on them.

    You know, all the stuff about vented rotors is crap. Ever notice how
    much the outside faces rust to the point where all the venting is
    jammed up?

    Preliminary numbers (based on just over 6k miles) indicates slightly
    more than 3k miles per 1/32 tread wear on the summer tires (Dunlop
    Sport 5000 - usually kept at 33 psi). Very rough figure is that these
    tires are good for 25k miles (if end-point is 2/32 tread). Will
    probably take another summer's worth of driving to get a better handle
    on tread wear rate.
    MoPar Man, Nov 30, 2003
  2. MoPar Man

    Bill Putney Guest

    I think by federal law the min. thickness has to be on there - but rust
    does make them hard or impossible to read sometimes.

    Front (specs. same regardless of PHP/non-PHP):
    Original thickness 25.87-26.13 mm (1.019-1.029 in.)
    Min. allowable thickness 24.4 mm (0.960 in.)

    Original thickness 11.63-12.13 mm (0.458-0.478 in.)
    Min. allowable thickness 10.4 mm (0.409 in.)
    I disagree that that means the stuff about venting is crap. I think
    what it means is that as rust gets thicker (and forms scales) and clogs
    up the vent paths that the rotors are more prone to warping. In
    general, venting aside, I'm not sure if light rusting helps by
    increasing surface area for cooling or hinders by insulating - maybe
    offsetting effects. But definitely scaling rust would decrease cooling
    (especially in the vents).
    That's why I don't buy so-called "high performance" tires - a lot less
    value for the money than a good touring tire IMO.

    Bill Putney
    (to reply by e-mail, replace the last letter of the alphabet in my
    address with "x")
    Bill Putney, Nov 30, 2003
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