powdrhound

Anyone have any issues with cracking of the Girodisc floating 350mm rotors? I'm wondering if this was a manufacturing defect in the steel as the other side did not crack even though it is worn to the point of the slots beginning to disappear.

http://www.flickr.com/photos/87731073@N06/8196475187/http://www.flickr.com/photos/87731073@N06/8196475187/ by http://www.flickr.com/people/87731073@N06/, on Flickr

AudiOn19s

How many track days on them?

powdrhound

68 track sessions of about 20-25 min each...

LVDell

68??? Do you not use the brakes???

Turn3 Autosport

What is the current thickness measurement?

powdrhound

The faster I have gotten the less brakes I use. I brake later, harder, and for shorter duration of time. I definitely use the brakes much less than when I first started tracking.

powdrhound

I'll measure it next week when I pull the wheels off. The slots are almost gone on the right front disc though, incidentally that's the disc that didn't fully crack but has many hairline cracks...

Mikelly

Dude, I had that happen on a Datsun Zcar about 20 years ago at Road Atlanta and ended up upside down under the bridge. Caliper and pad were jambed and caused the car to dig in and roll. I'd seriously think about getting that rotor off that car.

Mike

powdrhound

Oh yeah, no question. It's coming off. Car is in the garage.

ChrisF

Holy crap. I'd say that rotor lived a long and happy life. Now take it out back and put a bullet in it.

powdrhound

I'll measure it next week when I get it off the car. I'm sure they're at minimum thickness since the slots are almost gone on the right side rotor.

JohnPG

68 sessions is pretty good for fronts. I replace mine when they start showing some of those small intermediate cracks to the left and right of that big crack.

powdrhound

You're probably right. 68 sessions is close to 23 hrs of track use....

Here is my right side front rotor which only has the small hairline cracks but has the slots almost worn away

http://www.flickr.com/photos/87731073@N06/8198930937/http://www.flickr.com/photos/87731073@N06/8198930937/ by http://www.flickr.com/people/87731073@N06/, on Flickr

JohnPG

Yep, they are toast. Pretty good wear though. Once I start seeing those cracks start to open up I know they are on the last legs.

Now, the next problem, getting replacement rotors from Giro. I've not been able to order a set since earlier this year they have been out of stock. Don't get the slotted and drilled as replacements. Those only last a few days.

HiWind

68! 23 hrs! That's mammoth. Is that over 2 years?
Mine have 20 hc's and nothing like that yet.
Have you mailed them the pics?