GIRODISC Info

sr71bb · 02-23-2022, 06:47 PM

Getting ready to switch over to GIRODISC Rotors and I thought I would share with you other road race rats some interesting data that was shared with me by the GIRODISC tech boys.

For reference here I have a 2019 ZL1 1LE brake set up with GOODRIDGE stainless steel brake lines and DTC 70 front pads DTC 60 rear pads. My front rotor size is 15.35 inches (390MM) and weighs in at 32.8 POUNDS EACH. My REAR rotors are 14.4 inches (365MM) and weigh 26.5 pounds each

Brake PAD part number for FRONT DTC 70 pads is HB631U.622 and the DTC 70 rear pad part number is HB194G.570.

Now the Weight savings of the FRONT GIRODISC rotor compared to the STOCK ZL1 rotor is almost 5 POUNDS (28 lbs compared to 32.8 pounds). The OVERALL diameter of the GIRODISC Rotor is the SAME as the stock rotor but the Center area or Annulus is BIGGER on the GIRODISC rotor and is made out of aluminum instead of steel.

What this means of course you CANT use the HB631U.622 DTC70 PAD on the GIRODISC rotor because you need a pad with smaller SWEPT AREA. The pad to use on the GIRODISC would be HB649U.605 (DTC70).

Because the GIRODISC rotors have directional cooling veins they are labeled as LEFT and RIGHT. The stock rotors of course are NON-directional and can be used on either side.

There is even a slightly GREATER weight savings when comparing the REAR Girodisc rotors to the stock ones. The stock rotors weigh 26.5 pounds compared to roughly 19 pounds for the Girodisc rotors. You can use the SAME pads as you were using with the stock rotors on the REAR Girodisc rotors HB196G.570 DTC60 pads in my case.

I was curious as to WHY the front and the rear GIRODISC rotors were the same cost because the fronts were larger. Apparently there is more aluminum used in the manufacturing of the rear GIRODISC rotors because of the accommodation of the parking brake mechanisms.

I will be moving to this set up shortly.

kropscamaro16 · 02-23-2022, 06:56 PM

thanks for the info ive been looking at the giro disc rings vs the full rotors and i think im going to try out the rings for now since i have a spare set of rotors need to call ken this week an get them ordered up!

kropscamaro16 · 04-14-2022, 02:16 PM

got my giro rings from ken at kns brakes cant wait to get them on next month! gotta roast my old pads first then ill replace the pads and rear rotors

02-23-2022, 06:47 PM	#1
sr71bb Drives: 2019 Camaro Z-28 Join Date: Jul 2010 Location: Dallas Posts: 1,512	GIRODISC Info Getting ready to switch over to GIRODISC Rotors and I thought I would share with you other road race rats some interesting data that was shared with me by the GIRODISC tech boys. For reference here I have a 2019 ZL1 1LE brake set up with GOODRIDGE stainless steel brake lines and DTC 70 front pads DTC 60 rear pads. My front rotor size is 15.35 inches (390MM) and weighs in at 32.8 POUNDS EACH. My REAR rotors are 14.4 inches (365MM) and weigh 26.5 pounds each Brake PAD part number for FRONT DTC 70 pads is HB631U.622 and the DTC 70 rear pad part number is HB194G.570. Now the Weight savings of the FRONT GIRODISC rotor compared to the STOCK ZL1 rotor is almost 5 POUNDS (28 lbs compared to 32.8 pounds). The OVERALL diameter of the GIRODISC Rotor is the SAME as the stock rotor but the Center area or Annulus is BIGGER on the GIRODISC rotor and is made out of aluminum instead of steel. What this means of course you CANT use the HB631U.622 DTC70 PAD on the GIRODISC rotor because you need a pad with smaller SWEPT AREA. The pad to use on the GIRODISC would be HB649U.605 (DTC70). Because the GIRODISC rotors have directional cooling veins they are labeled as LEFT and RIGHT. The stock rotors of course are NON-directional and can be used on either side. There is even a slightly GREATER weight savings when comparing the REAR Girodisc rotors to the stock ones. The stock rotors weigh 26.5 pounds compared to roughly 19 pounds for the Girodisc rotors. You can use the SAME pads as you were using with the stock rotors on the REAR Girodisc rotors HB196G.570 DTC60 pads in my case. I was curious as to WHY the front and the rear GIRODISC rotors were the same cost because the fronts were larger. Apparently there is more aluminum used in the manufacturing of the rear GIRODISC rotors because of the accommodation of the parking brake mechanisms. I will be moving to this set up shortly. __________________ __________________________________________ 2019 SS 1LE BIG NA A10 Eagles Canyon Raceway 2.7 CCW Below https://youtu.be/c9M5UHDftcA 4-15-23 at SCCA TT U1 Class MEGA Thread on THIS car: https://www.camaro6.com/forums/showthread.php?t=602092 Retired Cars BELOW: 1973 Camaro, 1969 Camaro, 1969 Camaro SS RS 2010 Camaro SS with 1000HP F1R, 2019 ZL1 1LE A10

02-23-2022, 06:56 PM	#2
kropscamaro16 Drives: 2016 1ss camaro Join Date: Feb 2016 Location: 909 Posts: 10,134	thanks for the info ive been looking at the giro disc rings vs the full rotors and i think im going to try out the rings for now since i have a spare set of rotors need to call ken this week an get them ordered up! __________________ 16 1SS NIGHTFALL GRAY METALLIC WITH NPP #BECAUSERACECAR #SAVETHEMANUALS

04-14-2022, 02:16 PM	#3
kropscamaro16 Drives: 2016 1ss camaro Join Date: Feb 2016 Location: 909 Posts: 10,134	got my giro rings from ken at kns brakes cant wait to get them on next month! gotta roast my old pads first then ill replace the pads and rear rotors Attached Images __________________ 16 1SS NIGHTFALL GRAY METALLIC WITH NPP #BECAUSERACECAR #SAVETHEMANUALS

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