bprzekop

I am about to do my first trackday (2 day PCA DE at Barber in AL) with my 2007 GT3 which has 3K orig miles on orig Michelin Pilot Sport Cups. According to specs this tire comes with 6/32 tread depth; I have 5 or 6 on fronts, 4 or 5 on rears. It is possible that by the time of my track weekend I will have 3 or 4 left on rears. My experience with PS2's in past is that once tread depth gets low, traction is lost as is the case with most regular street tires. But the cup tire seems to be a "slick with grooves" and I am wondering if you folks think I will be ok on these rears for that weekend. I will likely need to replace rears afterwards, but am thinking that if I replace them before, I am putting them to pasture a bit too early. Thoughts? Experiences? Thanks.

sasportas

You'll be fine. Use them for the whole weekend. Only get into trouble when cords show on inner edge of rear tires. Rear camber greater than 2.1-2.2 will eat up your inside edge.

Snowboarder54

Replace them!!I only average 3200 miles on my rears, and that's just road miles. They get real greasy after that!!

blake

I get 5 or 6 track days out of my Sport Cups on my 996 GT3. It is my biggest expense for my track budget. Proper alignment will help with even wear, but the heat cycles issue (expect 24 for this tire) will also limit the lifespan.

-Blake

mooty

trust me. get a set of R888 and shave them. it's faster than mpsc and cheaper. last longer

jenk12m

my rears at 3600miles

jenk12m

and that was with no track days, just street driving

BKSPN33

Jen...were you drifting?? That is pretty dramatic wear.

I found that the heat cycles kill the tires before lack of tread. Cups that had very little tread still worked great on the track if they didn't have track heat cycles. I have a friend who buys sets of street worn Cups for super cheap and slaps them on for every track event and then tosses them out. Saves big cash and doesn't hurt performance (at least from what I can tell by his times).

My tires were cashed after 2100 miles and a few track events. The new camber settings helps a bunch though.

OldGuy

I got 5000 miles street miles and I dont think I drive that aggressively

RMA4

I only got 2430 street miles out of my SC's and the cord was showing on the inside of the rears. I put on Yokohoma Advans and really like them. Also changed the camber settings to less agressive.

John Boggiano

I think part of the problem is that the 'street' miles don't spread the wear across the tread the way pushing hard on the track does.

A mix of track and street driving got mine to 6K miles. There was really some more to go, I reckon I could have made it almost to 7k on them.

911/Q45

In my experience toe not camber causes most wear.

OldGuy

Don, I kinda buy Johns arguement. I have negative camber in my rears and front. the rears have worn on the inside. Since I havent tracked *this* Gt3 yet it makes sense to me

Isnt toe and camber different? toe is fore to aft azimuth as it were. Camber is ground to sky roll in aircraft speak. Isnt that right

mooty

yes, it's toe that kills tires not camber (to a degree, no pun intended).

i must be puttering around too much. my RS mpsc got about 5k on them, no cords showing. it's hardened with no grip but who needs grip driving to supermkt. i drift right into the tight parking spaces.

911/Q45

Camber just puts more weight on the inside edge, toe out scrubs rubber off the inside. Not much drifting in street driving(except for mooty!), so wear would be due to toe out.