The Kuhmo V730 would like to have a talk with you. Gives up nothing to the NT01 and feels better, handles heat well, lasts as long and better grip. It's time to join the 21st century.

Peter

 

RE-71RS is strictly a cooler weather/ TT tire. CR-S is better warm/ hot weather tire.

Also compound trumps size every time. Those are words of wisdom many people forget.

Peter

 

Replace the clutch. The clutch is relatively cheap.
The work is trivial when the engine is out.. Non-trivial once everything is put together.
With more power plus existing wear its worth considering.

My rule of thumb is to replace the clutch whenever the engine is out.

 

Thanks, Dan. I had the clutch replaced along with a trans rebuild in Dec 2016 about six months after I bought it), so it has been a while (20K miles ago). Slakker (Brandon Clark) is going to take a close look at it with the engine out and if it looks suspect at all, it will be replaced. But you make a good point about it in the context of bumping up the power (torque, really). I will emphasize it again with Brandon.

Thanks!

 

Thanks Peter. Fortunately for the RE-71RS, I generally am off track for July and August, so maybe the "cooler" reference works for me. Can be hot in June a bit. The compound (and profile?) versus width guidance does make sense.

Thanks!

 

Based on feedback in this thread, and some other web searching, here is what I found for tire options. I still need to run them past Paul at Radial Tire (my local shop) for his opinion and pricing. Wheels are 18". I have them roughly sorted in terms of my interest. Since Paul gets so much feedback from track drivers, I think he might be the deciding vote.

Bridgestone RE-71RS (200tw)
255/35 ($319 @ TR) and 295/30 ($386 @ TR) [$1410]

Nankang CR-S V2 (200tw)
255/35 ($351 @ Phil's) and 315/30 ($462 @ Phil's); both shown as out of stock but expected in August [$1626]

Yokohama Advan A052 (200tw)
255/35 ($347 @ TR) and 315/30 ($505 @ TR); stock in August and early Sept [$1704]

Nitto NT01 (100tw)
245/40 ($310 @ Discount Tire) and 305/35 ($405 @ Discount Tire); TBD availability? [$1430]

 

Fyi i just had a set of nt-01 delivered by tirebuyer in those sizes last week for $1238. 10% coupon and no sales tax to DE. Its my 3rd set i have got this year. Look around they r out there. I get around 50 heat cycles and they dont fall off.

R they the fastest? No but when u stack, price and longevity into the equation they r hard to beat.

 

OP,

Have you also checked out the RC1s from Maxxis? Not a fan of the v1s but supposedly the v2s were MUCH better and are a great value. Any RT660s available near your sizing? On your list of tires I don't think you can go wrong. How bout trying them all?? :-)

 

No question. you should update your clutch.

 

I've seen the Maxxis but never known anyone who tried them. I'm hesitant to consider. They max out at 275 width in 18's, so that is not wide enough for the rear.

Current (all used up) tires are RT660's. Previous set was Continental ExtremeContactForce. Slight preference to the Conti's over the Falken's.

Thanks.

 

What are your (and others) thoughts on going to an upgraded clutch, like Sachs or Spec? I certainly try not to bang the clutch but maybe a bit more torque capacity without sacrificing much streetability is good?

thanks

 

TR is now a Nankang CR-S dealer and have some sizes in stock. Just got a set of 245/35 19and 295/30 19 for the GT4. Be advised they run wide on tread width. The 295/30 rear is ~12" tread width and 245/35 front is ~9.5" tread width. They are pricey though.

Peter

 

Thanks Peter. I did find a good review of the latest version (v2/2023) of the CR-S. 200tw tire test | Revised Nankang Sportnex CR-S | Articles | Grassroots Motorsports I read this article completely and it commented very favorably on the RE-71RS, CR-S v2, and the A052. Pretty tight grouping.

Here is a listing of characteristics for the three tires I have used most recently (A, B, C) and the four new ones I am considering. Yellow highlighted cells mean there is conflicting data online. Otherwise, I think it is all correct. Most tires look fairly available except for the Nankang that seems to have had a shipping delay. Maybe there are others out there, but these are the best four I have found with sizes meeting my needs. Sorry if it is blurry. I can attach the Excel file if anyone wants it.

 

Steve

TR tread width numbers are screwy at least in the 2 sizes I purchase. Looking at their tread width numbers it looks like the generic tread width numbers not actual measured numbers. Kangs run wide

Peter

 

Thanks Peter. Yes, I agree that something seems off in the TR tread width numbers. But the Nakang CR-S v2 tire specs show a tread width only barely less than the section width.

255/35: SW = 10.2, TW =10.2
315/30: SW = 12.6, TW = 12.4

Does this seem reasonable?