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not many great tire choices for the factory sized GTR wheels. Have any of you done 19/19 ? i’d really like to get AR1 tires. CRS come in factory sizes but fall off unlike AR1. maybe try a 305 30/20 in the rear ? bit stretched. might be worth it though.
looking at the specs the 305 AR1 is 12.3 section width and 11.8 tread width. those just might work …….
cup 2 in comparison are 13 section and 12.2 tread. Michelin’s tend to run wide.
in case anyone asks why i’d want that tire they are a phenomenal track tire that also works well on street. noisy on road but blow away cup 2. liked them a lot better than GY Supercar 3R as well. heat up in half a lap. stiff sidewall. don’t drop off. o could get 4 days on a set in my C7Z running 1:36 at Laguna. Buddies GT3 RS just got five on his. I could still run within 2 seconds on day four. oh and they are cheap too.
thanks.
new wheels !! BC Forged. about $4400 out the door light weight 19x12 and 10x 10.5. 325 30 rear and 305 30 front
Good to hear your positive opinion of the Nankangs, I’ve got a set of wheels on the way for my GTC for track days and that’s the tyre I’m putting on.
As for the question about the wheels unfortunately I can’t help you, won’t be 100% certain the wheels I’ve ordered will fit until they arrive and are test fitted.
Good to hear your positive opinion of the Nankangs, I’ve got a set of wheels on the way for my GTC for track days and that’s the tyre I’m putting on.
As for the question about the wheels unfortunately I can’t help you, won’t be 100% certain the wheels I’ve ordered will fit until they arrive and are test fitted.
They are nearly a perfect tire. noise is the only complaint i have. on my C7Z the noise would mostly go away after first track day.
they are also very good on street. hook up like a drag radial. warm up around town in a few minutes. could launch my 650 HP corvette hard. i had four sets on that car. my buddy loves them as well on his GT3 RS. dropped 3 seconds off his laptimes first day with them.
i see the R888R are an option for stock sizes. i used those before and are a decent tire. they do fall off mid session though. even noisier. more expensive. NT01 were better. the aR1 were even better than the NT01s.
I did have someone recommend the R888R just the other day but they aren’t available here in Australia in the sizes I need/want (265/35 19 & 305/30 20) in any case and they are a reasonable amount more expensive than the Nankangs.
Pleased to hear you say they are ok on the road also as most of the tracks I’ll go to are 2-3 hour drive away and I think the new wheels will look pretty good on the car so wouldn’t mind leaving them on from time to time.
I did have someone recommend the R888R just the other day but they aren’t available here in Australia in the sizes I need/want (265/35 19 & 305/30 20) in any case and they are a reasonable amount more expensive than the Nankangs.
Pleased to hear you say they are ok on the road also as most of the tracks I’ll go to are 2-3 hour drive away and I think the new wheels will look pretty good on the car so wouldn’t mind leaving them on from time to time.
i kept mine on all the time. tons of street miles. tires were still great on track to the fourth day. 👍
Front are 9jx19 ET61 (exactly same as current fronts) & rears 11jx20 ET68 (current rears are 12jx20 ET46) so I’m putting in an 18mm spacer to put them pretty much where the current rears sit, I don’t think 4mm difference from original offset will be any issue but I’m new to this sort of thing so I may be wrong.
not many great tire choices for the factory sized GTR wheels. Have any of you done 19/19 ? i’d really like to get AR1 tires. CRS come in factory sizes but fall off unlike AR1. maybe try a 305 30/20 in the rear ? bit stretched. might be worth it though.
looking at the specs the 305 AR1 is 12.3 section width and 11.8 tread width. those just might work …….
cup 2 in comparison are 13 section and 12.2 tread. Michelin’s tend to run wide.
in case anyone asks why i’d want that tire they are a phenomenal track tire that also works well on street. noisy on road but blow away cup 2 and cup 2 R. liked them a lot better than GY Supercar 3R as well. heat up in half a lap. stiff sidewall. don’t drop off. o could get 4 days on a set in my C7Z running 1:36 at Laguna. Buddies GT3 RS just got dove on his. i could still run within 2 seconds on day four. oh and they are cheap too.
thanks.
It's been tempting for me to consider 19 inch rear as well, the only concern I have is whether it's enough to clear the rear wheel steering motor, that seem to be running very close to the wheel. I did try CR-S before, (275/325), like you mentioned the drop off is also pretty significant on heavy cars like the GTR, for me they heatcycled out with still plenty of threads left.
Front are 9jx19 ET61 (exactly same as current fronts) & rears 11jx20 ET68 (current rears are 12jx20 ET46) so I’m putting in an 18mm spacer to put them pretty much where the current rears sit, I don’t think 4mm difference from original offset will be any issue but I’m new to this sort of thing so I may be wrong.
nice looking wheel. why the 11 inch rear ? i used spacers before. get a quality one. make sure they are tight. i’d also use thread lock.
It's been tempting for me to consider 19 inch rear as well, the only concern I have is whether it's enough to clear the rear wheel steering motor, that seem to be running very close to the wheel. I did try CR-S before, (275/325), like you mentioned the drop off is also pretty significant on heavy cars like the GTR, for me they heatcycled out with still plenty of threads left.
never even thought about the wheel motor. good to know about the CRS. think i’ll skip it.
Im very tempted to use the 305 30 20 for rear. gt3 guys use the 305 sport cup on a 12 inch rim from factory. looking at specs the sport cup section width and tread width is not any wider than the AR1 ……. will make rear diameter 1/2 inch smaller. front is still 6/10 smaller diameter than rear. speedo will be off a little
nice looking wheel. why the 11 inch rear ? i used spacers before. get a quality one. make sure they are tight. i’d also use thread lock.
Availability and price mainly, plus the recommended wheel width by Nankang for the AR1 305/30 20 is 11inch so I didn’t see any down side to it apart from the offset issue. The only wheels I could find off the shelf in the 12 inch with the same offset as the originals was another set of what I’ve already got and they were a fair bit more expensive. I must admit the use of a spacer does concern me to a degree, there seems to be two schools of thought with using them, one being install a good quality one properly and they’ll be fine and the other just don’t use them. Guess I’ll find out. The place where I’ve bought them from assure they put them on cars with much greater horsepower and driven much more aggressively than I probably do without any problems.
It's been tempting for me to consider 19 inch rear as well, the only concern I have is whether it's enough to clear the rear wheel steering motor, that seem to be running very close to the wheel. I did try CR-S before, (275/325), like you mentioned the drop off is also pretty significant on heavy cars like the GTR, for me they heatcycled out with still plenty of threads left.
I didn’t even consider anything other than 20 inch rears for my gtc for that reason. There seems to be bugger all room around the rear steering mechanism as it is so doubtful a smaller wheel would fit.
has anyone done a 19 inch rear ? can’t believe no one has tried….. i may just have to get some after market 20s and an 11.5 inch rim. i’ll try the 305 ar1 first. they do run wider and if the gt3 from factory uses similar size tire on a 12 inch it should be fine. speedo being off will be the only issue but that can be tuned out…
Not sure if others have attempted but would be great to find out as well..
I'm curious to the 305 AR-1 as well, not too worried about speedo since it's going to be track only but really like to see how they compare against the cup2s.
Not sure if others have attempted but would be great to find out as well..
I'm curious to the 305 AR-1 as well, not too worried about speedo since it's going to be track only but really like to see how they compare against the cup2s.
blow the pants off the cup 2. cup 2 R ZP may be as good for a few laps but then fall on their face where the AR1 keep going.
I did not do any speedo recalibration and I also don't know the exact offset. I dont remember finspeed telling me the offset. I checked my old invoice and that info was also left out.
I could check with V8ray to see if he knows the offset on his track wheels.
I did not do any speedo recalibration and I also don't know the exact offset. I dont remember finspeed telling me the offset. I checked my old invoice and that info was also left out.
I could check with V8ray to see if he knows the offset on his track wheels.
okay great. thanks. running the carbon ceramics still ? i’m putting my AP kit on front and was planning on getting girodisc rotors and new pads for rear.
okay great. thanks. running the carbon ceramics still ? i’m putting my AP kit on front and was planning on getting girodisc rotors and new pads for rear.
I ordered mine with the steel brakes intentionally. I swapped out the rotors to the girodisc
I ordered mine with the steel brakes intentionally. I swapped out the rotors to the girodisc
To take this thread off course a bit, I ran my Girodisc for the first time last week for 2 days out at Area 27, which is a track well known for being extremely hard on brakes.
I bedded them in slightly before going to the track and then again more aggressively during the first session.
They performed phenomenally, I was a bit worried in a drop off in performance vs the CCBs. No worries at all. I beat on them pretty hard. Only issue I can think of is that the front tires heated up a lot faster than I previously remember when I was at Area 27 on the CCBs. Thinking a bit more heat retention in the Iron vs Ceramic. Just consciously forced me to be a bit more light/quicker on the braking zones.
To take this thread off course a bit, I ran my Girodisc for the first time last week for 2 days out at Area 27, which is a track well known for being extremely hard on brakes.
I bedded them in slightly before going to the track and then again more aggressively during the first session.
They performed phenomenally, I was a bit worried in a drop off in performance vs the CCBs. No worries at all. I beat on them pretty hard. Only issue I can think of is that the front tires heated up a lot faster than I previously remember when I was at Area 27 on the CCBs. Thinking a bit more heat retention in the Iron vs Ceramic. Just consciously forced me to be a bit more light/quicker on the braking zones.
Are you running cooling ducts? I'm on the tikt and they solved the overheating issues
06-04-2022, 02:07 AM
