I will use these for some daily driving and ~ 10 track days in 2012. Any thoughts relative others (e.g., NT-01s)? Thanks.

 

I believe the new Trofeos are due out soon. I had the previous generation Trofeos and they only lasted about 1.5 days of track use.

 

is cost one of the factors?
NT-01 is one of the chapest (if not THE cheapest) R-compunds while Pirellis are easily triple the price

 

Pirellis are much more expensive and will not last a third of the life of the NT01's.

 

is there anybody here who used NT01 on any 997 car in a combination where front tires are taller than rears? like 245/315 or 275/315? did you get any PSM/ABS related CEL?

 

For 18" wheels (my size of choice for the track):

I highly recommend the Notto R compound tires. To NOT get a CEL the only Nitto tires for the track combo is to use their NT O5 (100 tread compound) in the rear with either the 235/40/18 or 245/40/18 NT 01 (also 100 tread compound) in the front

 

Thanks, guys. I'm sticking with the NT-01s.

 

Or use the NT01 245-40-18 front (25.55" diameter), or even better 275-35-18s (also 25.55" diameter) on front completely eliminating front understeer, with the Toyo RA-1 305-35-18 (26.3" diameter) in the rear and not have to worry about any ABS/PSM issues on the 997. Toyo makes the Nittos and the two tires are supposed be the same compound. I've put four 305 RA-1s for sale in the marketplace section (two new and two just broken in)

There's really no other option right now for streetable R-comps in 18s you can drive to the track on unless you want to chance it with Hoosiers or V710s.

 

I regularly use Nt01 245/315 with no issues, but wish Nitto would make the 315 in a higher profile (315/35) so that the car's "angle of attack" was not changed (rear is about 1/2" lower with 315/30)

 

Will the 275/35 fit OK with standard offset wheels, or did you have to go with a different offset?

 

You'll need to rotate the strut tops and bring them in. Mounted on a 9" rim like standard CCWs ET 48, it will be close, about 2mm from the springs, but it will clear. If you need you could always add a 5mm spacer. If it will rub anywhere (such as if you don't bring in the strut tops in enough or use a spacer) it would just touch the forward portion of the wheel arch on a turn in compression, and you can easily do a little pull on the fender lip with your hands here to get an additional 5mm clearance if need and clear completely.

 

Thanks, that is very helpful.

 

As a development partner to Pirelli, we now have the NEW Pirelli Trofeo R in stock.

Currently 235-35-19 and 305-30-19

Please email me directly for other sizes and availability.

 

Nitto NT01 sizing WILL NOT work on a 997 based Porsche....996 yes...997 NO!

 

That is what I heard from many sources, but one tire vendor which is a sponsor on this site guaranteed me that I would have no issues using them on my 997.1 GT3. I took them up on that guarantee. Although perhaps not as aggressive as some drivers, I hold my own against most other drivers in the top run groups at track day events (Thunderhill, Infineon, Laguna Seca, Miller, High Plains, etc.. The NT01's work great for me -- no ABS, traction, CEL or other issues on the track or on the street. Also, no affect on cruise control on highway stretches.
Unlike my situation, some 997 users apparently have had issues with the NT01 in these sizes. Odd indeed that they work for some and not for others, but I am happy to be in the group that can use them. The NT01's are a great value and perform very well for a DOT approved tire.