Scca stu 2 piece rotors?
Oct 4, 2010, 09:43 AM
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As I read it, no...
14.6.a specifically allows cross drilled and slotted rotors.
14.6.e clearly states that non-standard brake rotors may be used provided they are the equal or larger dimension (diameter and thickness) and made of ferrous material (eg, iron) .
All the two piece rotors I have seen have a non-ferrous hat made from some alloy metal and not iron as required.
They are allowed in SP and SM
14.6.a specifically allows cross drilled and slotted rotors.
14.6.e clearly states that non-standard brake rotors may be used provided they are the equal or larger dimension (diameter and thickness) and made of ferrous material (eg, iron) .
All the two piece rotors I have seen have a non-ferrous hat made from some alloy metal and not iron as required.
They are allowed in SP and SM
Oct 4, 2010, 09:57 AM
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The SE, MR, and MR Touring uses 2-piece ventilated disc with alloy rotor hats and 4-piston brembo® caliper from the factory. Is that what you're referring to? If so then it is STU legal because it came on the car stock. Now if you upgrade beyond that it might be another story.
Oct 4, 2010, 11:55 AM
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Originally Posted by Rule 14.6.E:
STX and STU: Non-standard brake rotors may be used provided
are permitted but may serve no other purpose.
they are of equal or larger dimensions (diameter and thickness)
and made of ferrous material (e.g. iron).
and made of ferrous material (e.g. iron).
Thickness includes the individual
plates of a vented rotor, as well as the overall dimension.
Aluminum rotor hats are allowed. Cars originally equipped with solid
(non-vented) rotors may utilize vented rotors. Cross-drilled and/or
slotted brake rotors may be fi tted provided all such voids are within
the disc area, and comprise no more than 10% of that area. Brake
calipers and mounting brackets may be replaced provided they bolt
to the standard locations and the number of pistons is equal to or
greater than standard. A functioning emergency brake of the same
type, operation, and actuation as OE must be present. Drum brakes
may be replaced with disc brakes of a diameter equal to or greater
than the inside diameter of the standard drum. Such conversions
must be bolted, not welded, to the axle/trailing arm/upright, and must
include an integral, redundant emergency brake. Changes to backing
plates/dust shields/brake lines to accommodate these changes
plates of a vented rotor, as well as the overall dimension.
Aluminum rotor hats are allowed. Cars originally equipped with solid
(non-vented) rotors may utilize vented rotors. Cross-drilled and/or
slotted brake rotors may be fi tted provided all such voids are within
the disc area, and comprise no more than 10% of that area. Brake
calipers and mounting brackets may be replaced provided they bolt
to the standard locations and the number of pistons is equal to or
greater than standard. A functioning emergency brake of the same
type, operation, and actuation as OE must be present. Drum brakes
may be replaced with disc brakes of a diameter equal to or greater
than the inside diameter of the standard drum. Such conversions
must be bolted, not welded, to the axle/trailing arm/upright, and must
include an integral, redundant emergency brake. Changes to backing
plates/dust shields/brake lines to accommodate these changes
are permitted but may serve no other purpose.
Yes: 2-piece rotors are allowed in STX and STU.
Last edited by fsmtnbiker; Oct 5, 2010 at 06:49 AM.
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Oct 5, 2010, 07:07 PM
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A little clarification would be nice...
If you have a X, then I think the answer is yes, because it's available in stock trim as a factory option. If you have a 8 or 9, then no you can't run them in ST
If you have a X, then I think the answer is yes, because it's available in stock trim as a factory option. If you have a 8 or 9, then no you can't run them in ST
Oct 6, 2010, 10:27 AM
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The rule says "Aluminum rotor hats are allowed", so they are allowed and there is no restriction beyond that. If it had said something along the lines of "Aluminum rotor hats are allowed ONLY if they came standard or as a factory option on the car", then yes, only the X MR's would be legal in that case.
Oct 7, 2010, 01:02 AM
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Rule 14.6.E:
STX and STU: Non-standard brake rotors may be used provided
they are of equal or larger dimensions (diameter and thickness)
and made of ferrous material (e.g. iron).
Thickness includes the individual
plates of a vented rotor, as well as the overall dimension.
Aluminum rotor hats are allowed. Cars originally equipped with solid
(non-vented) rotors may utilize vented rotors. Cross-drilled and/or
slotted brake rotors may be fi tted provided all such voids are within
the disc area, and comprise no more than 10% of that area. Brake
calipers and mounting brackets may be replaced provided they bolt
to the standard locations and the number of pistons is equal to or
greater than standard. A functioning emergency brake of the same
type, operation, and actuation as OE must be present. Drum brakes
may be replaced with disc brakes of a diameter equal to or greater
than the inside diameter of the standard drum. Such conversions
must be bolted, not welded, to the axle/trailing arm/upright, and must
include an integral, redundant emergency brake. Changes to backing
plates/dust shields/brake lines to accommodate these changes
are permitted but may serve no other purpose.
In bold puts some 2 piece rotors out like the GiroDisc ultralites.
STX and STU: Non-standard brake rotors may be used provided
they are of equal or larger dimensions (diameter and thickness)
and made of ferrous material (e.g. iron).
Thickness includes the individual
plates of a vented rotor, as well as the overall dimension.
Aluminum rotor hats are allowed. Cars originally equipped with solid
(non-vented) rotors may utilize vented rotors. Cross-drilled and/or
slotted brake rotors may be fi tted provided all such voids are within
the disc area, and comprise no more than 10% of that area. Brake
calipers and mounting brackets may be replaced provided they bolt
to the standard locations and the number of pistons is equal to or
greater than standard. A functioning emergency brake of the same
type, operation, and actuation as OE must be present. Drum brakes
may be replaced with disc brakes of a diameter equal to or greater
than the inside diameter of the standard drum. Such conversions
must be bolted, not welded, to the axle/trailing arm/upright, and must
include an integral, redundant emergency brake. Changes to backing
plates/dust shields/brake lines to accommodate these changes
are permitted but may serve no other purpose.
In bold puts some 2 piece rotors out like the GiroDisc ultralites.
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