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Bumping this back up. Anyone else try the Kumho ACR on their Z06? Looks like they make some amazing grip, just have to deal with the large delta in front/rear diameters 24.9"/27.5"
They are really cheap now on if you're interested, $238 for fronts, $343 for rears on Tire Rack
The tires are much faster than the driver and I am trying to work up to the grip level they provide. I've run a track day at Thunderhill and another at Laguna Seca, three autox events, and several thousand street miles to date. The only real wear issue I have is from the tire setting down into the front fender and cutting the front passenger outside edge at LS in turn 6. My non-Z07 suspension is too soft to take that turn fast. There's a little cord showing but it's not on the surface so I'm still running them. I also added more F&R camber after the TH track day and they are happier with that.
I put in a 141.3 at LS on a 90 dB day running in Point-By with coasting through turns 5 and 6 for sound and bottoming issues. The chart below shows Max Lat. Gs. for that day. Not bad for street tires with an old man driving.
--Dan
Originally Posted by Luke@tirerack
I have seen that diameter difference cause issues with the Corvette onboard electronics
Thanks for the fast response Luke.
Looking at the quote above it looks like Dan had a great track session with these. Be interesting to know how he did it, or is the C7 is more tolerant of size changes than feedback you received?
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19-'20-'21-'22-'23-'24
I'm running a 285/35/18 front and a 355/35/19 rear on my Z for almost a year now with no problems at all. Plenty of dry weather grip and really not to bad in the rain. We had a couple track events scheduled but the virus put a hold on those. They are also super quite at highway speeds.
05-12-2020, 01:11 PM
