Got My Nitto NT01 305's!...They are Wide!
#17
Nordschleife Master
18" wheels seem to not fit on the new 991 Porsche cars but 19" will fit those cars. I'm hanging on to my GTS "wanna be" a few more years and see what shakes out with Porsche and other brands. Due to cost reasons I may jump down into a Cayman or other brand in a few years. I'm not interested in having the fastest car at a DE...I just want to drive what ever I have well, have fun and drive well.
#18
Race Director
Thread Starter
#21
Rennlist Member
Again, what's the problem with using 315 NT01s? Is it that the diameter of the 305/35 is closer to OEM than the 315/30? I just ordered a new set of 245/40 + 315/30 NT01's for my 6GT3 so curious why the excitement about the 305's?
#22
Rennlist Member
My 6GT3 came with a set of NT01's like you just ordered, and the previous owner had the car professionally setup by a shop that I know has a very good rep so I think the 315/30 size is just fine for the 6GT3.
#23
Burning Brakes
I like 31-32F and 33-34R with the 245/315 Nitto combo. I assume the 305 rear will be similar.
Anything over 36 PSI hot I can tell instantly on the track. They get funny/greasy in the corners and under braking.
I start out at 24F - 26R cold and find I don't have to bleed off too much over the day. I check them each time I get back to the paddock and usually only need to drop 0.5 PSI (Unless it started out really cool in the morning and the ambient temps went way up during the day. 50* AM and 90* PM can happen in the spring here)
#24
Race Car
The shorter 315/30 rear caused enough of a rolling diameter difference to upset the ABS and occasionally cause ice mode for some. the 35 series profile on the 305 gives that extra diameter to make them safe to use.
it's not an issuse on our '6 GT3's. 315's are good to go on our cars.
**edit** one more thought. I really like 36/38 on the Nitto's. They "felt" better at like 34/36 but I was starting to get a wear pattern to the tires indicating pressure was not high enough (cupping in the center) at those pressures.
#25
Rennlist Member
Are some of you guys driving to/from the track on these tires? I'm looking for something that works for tracks 1-2 hours away - to drive there and run a DE and then drive back home.
#26
Race Car
Yes, all the time. Drove them to work the other day cause I've been too lazy to take them off since the last track day. They suck in the rain if they're not full tread.
#27
Rennlist Member
Yes, you can drive them but pay extra caution (drive much slower) in rain especially when you have little thread left.
#28
Rennlist Member
#29
Race Director
Thread Starter
#30
Rennlist Member
Says the guy that has never run them
Yes, I've been through 4 sets. They're fine.
The 315/30 is a little too short for the 997 cars which had a slightly different tire height from the factory front to rear vs. our cars.
The shorter 315/30 rear caused enough of a rolling diameter difference to upset the ABS and occasionally cause ice mode for some. the 35 series profile on the 305 gives that extra diameter to make them safe to use.
it's not an issuse on our '6 GT3's. 315's are good to go on our cars.
**edit** one more thought. I really like 36/38 on the Nitto's. They "felt" better at like 34/36 but I was starting to get a wear pattern to the tires indicating pressure was not high enough (cupping in the center) at those pressures.
The shorter 315/30 rear caused enough of a rolling diameter difference to upset the ABS and occasionally cause ice mode for some. the 35 series profile on the 305 gives that extra diameter to make them safe to use.
it's not an issuse on our '6 GT3's. 315's are good to go on our cars.
**edit** one more thought. I really like 36/38 on the Nitto's. They "felt" better at like 34/36 but I was starting to get a wear pattern to the tires indicating pressure was not high enough (cupping in the center) at those pressures.