Anyone mounted up 255/40R17 Nankang CR1s? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Turbo · 05-09-2021, 03:52 PM

I've heard these fit VERY wide - like 275/285ish.

Curious what people's experiences have been with our platform? I have run 255/40R17 AR1s without any rubbing or issues, but they only ran a touch oversize I believe.

Also curious on feedback from anyone who has driven both these and A052's on track. A052s have pretty soft sidewalls - do the CR1s share this trait?

Breezio · 05-09-2021, 11:20 PM

Hoping to mount some up as soon as they arrive.

I'm not sure about the 255's, but a buddy running STS with 225's, his 225 Yoks are wider then his 225 CR-1s.

smg1138 · 05-10-2021, 02:40 PM

I'm really interested to see how fast they are compared to the A052's. Tread design on them is very similar.

ZDan · 05-10-2021, 04:56 PM

https://philstireservice.com/wp-cont...CR-1-Specs.pdf
According to this, 255/40-17 have 259mm section width on 9" wheel.
I'm running 245/40-17 on 9" wheels, but to me they look wider than the 249mm shown here, I would have guessed 255 minimum, so...

Ran these at New Hampshire Motor Speedway (chicane/chicane) yesterday, did a best lap of 1:19.26, unfortunately not in my time trial... I ran 1:20.20 time trial same car on 245/40-17 RE71R a couple of years ago.

Breezio · 05-11-2021, 08:26 AM

Also, my 255 CR1s are arriving on Monday. I'll let you know when I get them mounted.

ZDan · 05-11-2021, 08:51 AM

Quote:

Originally Posted by ZDan

I'm running 245/40-17 on 9" wheels, but to me they look wider than the 249mm shown here, I would have guessed 255 minimum, so...

Looking again, 249mm for section width seems about right, the sidewall is a lot more square which makes them look wide. 245/40-17 has 9.8" section width, 9.6" treadwidth, vs. A052 with 9.9" section width, 8.9" tread width.

jflogerzi · 05-11-2021, 11:00 AM

Just saw a YT video on this and they run wide. I'd you want to fit a 255 you should get a 9.5 inch wheel. 245 will fit nicely on a 9 inch wide rim

Sent from my GM1915 using Tapatalk

Chuckls · 05-11-2021, 07:58 PM

I have 255/40/r17 CR1 on my 17x9 Rays 57CR. what exactly are you looking for?

smg1138 · 05-12-2021, 05:18 PM

Quote:

Originally Posted by ZDan

Looking again, 249mm for section width seems about right, the sidewall is a lot more square which makes them look wide. 245/40-17 has 9.8" section width, 9.6" treadwidth, vs. A052 with 9.9" section width, 8.9" tread width.

Wait, the tread width is 9.6"? That seems really wide for a 245/40-17

NoHaveMSG · 05-12-2021, 05:47 PM

Quote:

Originally Posted by smg1138

Wait, the tread width is 9.6"? That seems really wide for a 245/40-17

Works out about right. 9.6X25.4 = 243.84mm

My 245 RT660's just showed up and they measure about the same.

Turbo · 05-13-2021, 01:03 AM

Quote:

Originally Posted by Chuckls

I have 255/40/r17 CR1 on my 17x9 Rays 57CR. what exactly are you looking for?

I'm concerned about rubbing issues, mainly.

I was fine with 255/40 AR1s and RS4s - just concerned about the CR1s, as I heard rumors the 255's runs especially wide. The 255 AR1s are sized closed to a traditional 265, for instance.

I'm also curious about feedback on sidewall stiffness compared to A052s, which are a bit soft.

Icecreamtruk · 05-13-2021, 01:43 AM

Dont know about CR1s, but 255 Falken Rt660 are wider than 275 Maxxis RC1.

ZDan · 05-13-2021, 08:41 AM

Quote:

Originally Posted by Turbo

I'm also curious about feedback on sidewall stiffness compared to A052s, which are a bit soft.

Feedback is good. I'd rate it better vs a052 with the caveat that I ran those on a 987. Cayman. Drawback is weight, the cr1 is about 3 lb heavier. Which according to data nullified any power gains I got from. Ace350 header and tune...

But enough more grip that I got fuel starvation coming out of turn 6 (180 degree banked left aka "the bowl) at NHMS at 7/8 tank, which has never happened before. Palpably more grip vs RE71R I used to run, or even 8-cycle Hoosiers I ran there last Fall

Turbo · 05-13-2021, 03:07 PM

Quote:

Originally Posted by ZDan

Feedback is good. I'd rate it better vs a052 with the caveat that I ran those on a 987. Cayman. Drawback is weight, the cr1 is about 3 lb heavier.

Thanks, Dan.

How is the sidewall stiffness on the CR1? A052 are pretty soft in that respect.

05-09-2021, 03:52 PM	#1
Turbo Senior Member Join Date: Jul 2012 Drives: FR-S Turbo Location: Grand Bend Posts: 310 Thanks: 337 Thanked 84 Times in 60 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Anyone mounted up 255/40R17 Nankang CR1s? I've heard these fit VERY wide - like 275/285ish. Curious what people's experiences have been with our platform? I have run 255/40R17 AR1s without any rubbing or issues, but they only ran a touch oversize I believe. Also curious on feedback from anyone who has driven both these and A052's on track. A052s have pretty soft sidewalls - do the CR1s share this trait?

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05-09-2021, 11:20 PM	#2
Breezio Senior Member Join Date: May 2020 Drives: 2017 BRZ series.yellow Location: Idaho Posts: 195 Thanks: 105 Thanked 155 Times in 79 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hoping to mount some up as soon as they arrive. I'm not sure about the 255's, but a buddy running STS with 225's, his 225 Yoks are wider then his 225 CR-1s.

05-10-2021, 02:40 PM	#3
smg1138 Senior Member Join Date: Jan 2014 Drives: 2013 Raven FR-S Location: Nashville Posts: 775 Thanks: 968 Thanked 213 Times in 136 Posts Mentioned: 3 Post(s) Tagged: 2 Thread(s)	I'm really interested to see how fast they are compared to the A052's. Tread design on them is very similar.

05-10-2021, 04:56 PM	#4
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,377 Thanked 3,891 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	https://philstireservice.com/wp-cont...CR-1-Specs.pdf According to this, 255/40-17 have 259mm section width on 9" wheel. I'm running 245/40-17 on 9" wheels, but to me they look wider than the 249mm shown here, I would have guessed 255 minimum, so... Ran these at New Hampshire Motor Speedway (chicane/chicane) yesterday, did a best lap of 1:19.26, unfortunately not in my time trial... I ran 1:20.20 time trial same car on 245/40-17 RE71R a couple of years ago.

05-11-2021, 08:26 AM	#5
Breezio Senior Member Join Date: May 2020 Drives: 2017 BRZ series.yellow Location: Idaho Posts: 195 Thanks: 105 Thanked 155 Times in 79 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Also, my 255 CR1s are arriving on Monday. I'll let you know when I get them mounted.

05-11-2021, 07:58 PM	#8
Chuckls Moutain Runner Join Date: Aug 2018 Drives: BRZ Location: Atlanta, GA Posts: 487 Thanks: 23 Thanked 300 Times in 166 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I have 255/40/r17 CR1 on my 17x9 Rays 57CR. what exactly are you looking for?

05-13-2021, 01:43 AM	#12
Icecreamtruk Senior Member Join Date: Dec 2015 Drives: Track preped NA FRS Location: Montreal, Canada Posts: 987 Thanks: 1,056 Thanked 680 Times in 405 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Dont know about CR1s, but 255 Falken Rt660 are wider than 275 Maxxis RC1.

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