Originally Posted by VThokies

Thanks JV.

I'm at 1.5 front, 1.25 rear. My tire wear on the front is not good, eats the shoulder pretty bad, so I plan to bump that up. So you run 2.5 front / 2.0 rear with stock washers in place on front and rear?

Thanks again.

Originally Posted by X25

Thanks, great to hear that the sizes work! Do you have magna ride? I bought a Z51 without magna ride, which comes with stiffer springs. Combined with the much stiffer T1 suspension's shocks, I'm hoping squat should not be an issue.

Assuming you have MR: Z51 with magna ride comes with softer springs to provide a comfortable ride at the street or even when softness is needed at the track, and the shocks stiffen at the track to make up for soft springs. This works well, until you replace the tires with stickier ones and push the shocks more than they are tuned for. If not already, you should consider buying the DSC module, which would help you match the shocks' tune with the traction you have from those tires.

Looking forward to trying out my setup at the track : )

Originally Posted by AUTO_X_AL

I have MR on my car using Re71R's. What's this dsc module??

Originally Posted by X25

Check it out:
https://www.corvetteforum.com/forums...uspension.html

Controller:
http://store.katechengines.com/dsc-s...px?Thread=True

If you want to go all the way:
http://store.katechengines.com/dsc-s...ocks-p521.aspx

Originally Posted by VThokies

Run the non-run flat MPSS in a +1 size on a spare set of factory Z51 wheels. I go through about two sets of front tires to one set of rears. Eight track days on the front tires, about one and a half hours of track time each day. Compromise alignment between street and track.

Of course tire wear would vary widely depending on the track and driver, but it will give you some kind of idea.

Originally Posted by Internetguru

I may try doing that as it saves $450-$500/set.

OEM size is:
FRONT 245/35R19
REAR 285/30R20

So +1 size would be?
FRONT 255/35R19
REAR 295/30R20

What is the advantage of running the +1 size? More grip?

Originally Posted by Along4theRide

On my 2015 Z51 I'm running Cray Spiders 18x9.5 +56 (front) & 19x11.0 +76 (rear) with Hoosier A7 275/35/18 (front) and 315/30/19 (rear). This are simply amazing on the track and are night and day over the stock tires (Thanks Alex @ TheSpeedDepot). For pads I'm using Carbotech XP20 and XP12 pads (Thanks Adam@Amp'dAutosport.com) and running Motul660 brake fluid. Finally, Spiegler SS Brake lines. Otherwise the car is stock except for cosmetic items.