Wheels and Tires All things related to Miata Wheels and Tires.
Sponsored by:
Sponsored by:

100tw Nankang AR-1, 245/40/15

Old 02-12-2019, 12:52 PM
Senior Member
Thread Starter
Join Date: Feb 2007
Location: Aliso Viejo, CA
Posts: 1,059
Total Cats: 324
Default 100tw Nankang AR-1, 245/40/15

Available outside the US as 80tw already. Coming to the US as 100tw, "soon" according to Nankang Motorsports. Probably through R Compound USA, at least. I know nothing else about their dealer network or anything. Their size chart doesn't even list the 225/45 or 245/40, but they're showing up on cars in EU and being tested here in socal.

Dan @ Supermiata
"Button" NASA ST5/TT5 project.
doward is online now  
Old 02-12-2019, 01:22 PM
Senior Member
matrussell122's Avatar
Join Date: Sep 2016
Location: Seattle
Posts: 1,065
Total Cats: 137

sub'd for more info
matrussell122 is offline  
Old 02-13-2019, 07:05 AM
Junior Member
Join Date: Jul 2017
Location: Sussex, England
Posts: 85
Total Cats: 3

These look very interesting. I actually ran one of the first batch of AR1s back at the start of 2016 in 195/50R15 on a 7J with the Supermiata race alignment settings. Were ridiculous as stickers, good for the next 10 or so heat cycles then became increasingly difficult to switch on. In the end, I couldn't kill them and removed them just due to the heat cycles but all still had more than 2mm tread all over. To replace them I went with AD08Rs in the same size, seemingly the stock engine heavy NB2 didn't have enough power (especially torque) to maintain slip angles with the AR1s and I prefer that car with the lower grip AD08Rs. Slight aside, but they had comedy levels of low grip in low temps with a few heat cycles when driving from the track but fine when new.

I also tried them in 225/40R18 on an 8J on a standard Renault Megane R26 (ie almost no camber, 230hp, 1350kg FWD car with LSD). Here they were very disappointing, barely any more grip than Michelin Pilot Super Sports and an axial tread split formed on day one, though never seemed to be an issue. The pyrometer readings obviously had the wrong gradient due to barely any camber, but they weren't as bad as the grip levels suggested.

I bought another set of 205/50R15 at the start of last year to run on 8s on my turbo track miata, but the 225/45R15 and 245/40R15 came out before I finished building the car so I bought some 9s. In the end, the huge European cost of these meant I bought a set of 225/45R15 Federal RS-RR and was very disappointed in the grip, so will likely replace with AR1s shortly.

Pro Track Wheels has fitment photos of these mounted on various rim widths on Instagram. It looks like 225/45R15 has a fair amount of stretch on a 9J. The quoted section width of the 225s isn't much more than the 205s, but the 245s are relatively fatter according to the sheet. (205 says 214mm, 225 says 225mm, 245 says 248mm). Also, oddly the 245 is lighter than even the 205.

One point to mention on the tread wear ratings, I highly suspect this has been driven by EU rolling resistance legislation eg 205/50R15 80TW = F for rolling resistance, 100TW = E. The EU are phasing out F rated tyres....
Tran is offline  
Old 02-14-2019, 12:00 PM
Junior Member
Join Date: May 2015
Location: Portugal
Posts: 53
Total Cats: 14

My experience is slightly different, bought some 195 AR-1 last October. Sidewalls are very stiff so they work just fine with super low pressures on stock 6J wheels, should be great on wider wheels. I ran them on the street for around 1000km including some 500km road trip (cold and rain), and a few mountain visits at high pace (so maybe 3-4 low intensity heat cycles). They heat decently fast after 5-6 hard corners and I ran them nicely at 1.9 bar with no issues due to the stiff sidewalls (even at 1.6bar they dont fold the sidewall that much so its definitely very nice).

After this, In December, trackday at Algarve circuit running -2.8f, -2.5r camber with stock NBFL sways, grip was very good. At the very end of the second 20m session I noticed the rear was a bit more loose. In the third session I confirmed the tires were significantly more buttery. Overall grip was still high but nowhere near the same feeling. That being said, the tires became a lot more fun at that point
I used over 50% of the tread during the 6x 20 minute sessions (4 with passenger), it is now maybe 3mm from the wear marks on the insides.

After the trackday, when cold (12-16 degrees C) the tires just have hilarious slip angle and low grip, similar to what Tran said. the first few km the car feels to me what I think driving those Goodwood classics on vintage tires feels like :P
After they warm up in the mountains the grip is definitely not terrible, but the feeling is very vague. (It is currently about 8C outside at night so you cant get them THAT hot)

- They wear decently in terms of tread (I guess it should usually match the normal heat cycles anyway)
- They heat cycle very fast
- They heat up decently quickly even during "cold" weather (18C-21C ambient, 15-27C track)
- They are very loud and droney on the road
- They have good/stiff sidewalls so you can run very low pressures on thin wheels

Some other people here have ran them on faster turbo miatas with 225 size, from what I understand everyone kinda agrees that they appear to have similar grip to R888R, seem to warm up a bit faster but also seem to overheat easier.

Some people have 245s ready to go but have not tested yet. (its basically the only 245 option over here under 200 euro)
lbatalha is offline  
Related Topics
Thread Starter
Last Post
Miata parts for sale/trade
07-20-2010 10:28 AM
General Miata Chat
03-07-2010 10:51 PM
General Miata Chat
07-09-2008 11:10 PM
Group Buys and Member Discounts
04-10-2008 05:27 PM
Prefabbed Turbo Kits
10-29-2006 03:12 PM

Thread Tools
Search this Thread
Quick Reply: 100tw Nankang AR-1, 245/40/15

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.