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 Compeition (rcomp) Tire Information
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coolhandluke
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13085 posts [100%]
HI
12-12-2005
  Rcomp Tire Information« » Reply  Edit


***Intro thread - More information will be provided as we build this topic

RComp – DOT Approved Tires

Format:
Tire Vendor – MFG’s UTQG
Tire Size – Tread Depth(in), Tread Width, ($Price)


Maxxis Victra RC-1 – 100 A A UTQG
205/50/15- 6/32’’, 8.6’’* ($NA)
225/45/15- 6/32’’, 8.9’’* ($NA)
*Section width

Nitto NT01 – 100 AA A
205/50/15- 6.3/32’’, 8.35’’ ($145)
225/45/15- 6.3/32’’, 8.86’’ ($154)

Pirelli P Zero Trofeo R – 60 AA A UTQG
205/50/15 – 5/32’’, 7.2’’ ($139)
225/50/15 – 5/32’’, 7.8’’ ($155)

Toyo Proxes RA1 – 100 AA A UTQG
205/50/15- 8/32’’, 8’’ ($171)
225/45/15- 8/32’’, 8.7’’ ($183)

Toyo Proxes R888v2 – 100 AA A UTQG
205/50/15 – 6.3/32’’, 8’’ ($154)
225/45/15- 6.4/32’’, 8.7’’ ($169)

Yokohama Advan A048 – 60 A A UTQG
205/50/15- 6/32’’, 8.2’’ ($216)
225/50/15- 6/32’’, 9.1’’ ($225)


98-1040
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97' #171

ITR Expo 16 Event Photo Thread



RTW DC2R
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2312 posts [100%]
NYC
10-20-2002
 « Re: Rcomp Tire Information (coolhandluke)« » Reply  Edit


So now Im thinking since I have dedicated track wheels I might as well make the jump to Rcomps. Otherwise Ill likely give the 71R's a try.

Pros/Cons of why or why not make the switch to Rcomps?


98-0034 - Track Daze y0
00-XXXX - The OG NOPI Fish Tank Type R - SOLD

My For Sale thread ITR and Misc Parts For Sale


Xian
Suffers from Chronic Car ADD

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1780 posts [100%]
Fl
1-3-2012
 « Re: Rcomp Tire Information (RTW DC2R)« » Reply  Edit


Versus something like the 71R, they're:

More expensive
Wear more quickly
Heat cycle more quickly
Are a pain in the ass to street drive (worse with pavement irregularities, louder)
Tend to be more peaky (read: they'll cover driving mistakes more easily vs. developing you as a driver)
Aren't as good in the rain
Start with less tread depth or need to be shaved (RA-1 needs shaving)

If you've already done 2-3 seasons on street tires and are pretty fast, you can disregard the driver development piece. It's not as critical but you're still going to give up a little learning.


Christian
Rotating inventory of stuff...
FASTtech Limited- DL1, Schroth, & Recaro Goodness
LTB Motorsports- The Cheapest Place for Momo
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coolhandluke
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13085 posts [100%]
HI
12-12-2005
 « Re: Rcomp Tire Information (Xian)« » Reply  Edit


Fantastic response Christian.
98-1040
98-0197 - Sold
01-0187 - Sold
97' #171

ITR Expo 16 Event Photo Thread


RTW DC2R
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2312 posts [100%]
NYC
10-20-2002
 « Re: Rcomp Tire Information (coolhandluke)« » Reply  Edit


Thanks for the info. Thats pretty much along the lines of what I was thinking. I dont really understand the heat cycling and shaving aspects. And probably one of the main things I remember hearing aboutin the past was that street legal tires like Azenis are more forgiving as they let you slide the car around a bit. But Rcomps ride more of a fine line between grip and breaking loose. They tend to either grip, or let loose. I think thats what youre referring to regarding "peaky". Is that accurate?

I think I have enough track miles to be pretty confident in my abilities for the tires. Honestly I think cost and life are the deal breakers for now. Sunk a lot of money into the car this off season with more to come so Rcomps will probably be put on hold.


98-0034 - Track Daze y0
00-XXXX - The OG NOPI Fish Tank Type R - SOLD

My For Sale thread ITR and Misc Parts For Sale


Xian
Suffers from Chronic Car ADD

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1780 posts [100%]
Fl
1-3-2012
 « Re: Rcomp Tire Information (RTW DC2R)« » Reply  Edit


Happy to chime in.

Heat cycling- all tire cycle out over time. Every time the tire comes up to temp and then drops back to ambient is a heat cycle. Typically the softer/racier the compound, the less they tolerate heat cycles. Meaning that each time you use the tire, it loses a little bit of its mechanical grip due to the rubber hardening ever so slightly. Something like a Hoosier R6 was in its prime for the first ~6 cycles, still awfully darn good until cycle 12-14, from then until cycle 20-24 they weren't junk but they also aren't competitive against fresh tires so they'd be good for practice sessions, after 24 they've fallen off and drive differently enough from fresh tires that they're junk. If you run old tires that are cycled out, you'll wonder what's wrong with the setup and make changes based on bad data... as soon as you put on fresh tires, all the problems disappear.

The R888 seemed to me to cycle out *very* quickly and then drop off to a 200TW sorta grip. When they were new, they didn't have much better outright grip than the 200TW stuff but they were better at multi-tasking inputs (braking plus turning in particular). This was back when the original Rival was around... I suspect the gap is even smaller now that the Rival-S and 71R have upped the playing field.

NT01- no first hand experience driving on them but folks who run them seem to love them. Slightly better than 200TW grip and they don't cycle out as quickly as the R888. These would be way up on my list of R-comp, track day tire options... you could street drive them in a pinch but they're a little more aggressive than the 200TW stuff. You can also buy them at Wal Mart for cheap.

The RA-1 isn't (IMO) any better than the 200TW stuff now and, in some ways, actually worse. If you don't shave them down before running them, they'll chunk (unless they're a 100% rain tire). Yes, they last forever but that's because the get harder and harder due to heat cycling. To their credit, the handling improvements due to shorter/worn treadblocks offsets the heat cycling so they're very consistent over their life but they're simply old tech now and have been outclassed.

Peaky- yeah, they can tend to have a sharper line between "everything is going fine" and "shit, they just let go". This is more apparent in something like the Hoosier... other tires tend to have broader grip plateaus but they're still going to be more peaky than street tires. Because R-comps are more peaky, it's easier and even natural to under-drive the tire slightly. This can impact and slow driver development... you end up driving consistently at 90-95% of the tire's capacity. Toss on street tires and it's easier to access 100% of the tire's limit. You can hit 100% and the car won't bite. You can run over 100% and it still won't bite (as long as you're wheeling). Even within street tires, there are differences and variability in how they handle heat and driving over 100%... The BFG's are great with that; you can slide them around and they just take it. The Z2SS is a little more peaky and can be prone to overheat... which makes them feel even more peaky as they let go from heat. The 71R is a little more peaky than the Rival-S but they're better with heat and better being pinched (because of their stiffer sidewall).


Christian
Rotating inventory of stuff...
FASTtech Limited- DL1, Schroth, & Recaro Goodness
LTB Motorsports- The Cheapest Place for Momo
TrackSpeed Motorsports- OMP, Racetech, & Driver Gear


RTW DC2R
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2312 posts [100%]
NYC
10-20-2002
 « Re: Rcomp Tire Information (Xian)« » Reply  Edit


Nice info! Much appreciated
98-0034 - Track Daze y0
00-XXXX - The OG NOPI Fish Tank Type R - SOLD

My For Sale thread ITR and Misc Parts For Sale


Ronin




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171 posts [100%]
5-30-2005
 « « » Reply  Edit


Any of you track guys run 225/45-17s? I have seen some photos of 17s on the ITR and it looks tall. Trying to sort out a final drive issue for the track with the K20 trans. Thanks
98 ITR - #456 sold
97 ITR - #97 sold
00 ITR - #1308 sold
98 ITR - #473 current
85 CRX-Si - current (original owner)



coolhandluke
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13085 posts [100%]
HI
12-12-2005
 « Re: (Ronin)« » Reply  Edit


Quote, originally posted by Ronin »
Any of you track guys run 225/45-17s? I have seen some photos of 17s on the ITR and it looks tall. Trying to sort out a final drive issue for the track with the K20 trans. Thanks

Don aka Legoman ran 17's but unsure on sizing. I will see if I can get him to chime in.


98-1040
98-0197 - Sold
01-0187 - Sold
97' #171

ITR Expo 16 Event Photo Thread


zygspeed
Got Boost ?

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385 posts [100%]
NE OH
9-25-2002
 « Re: (Ronin)« » Reply  Edit


Quote, originally posted by Ronin »
Any of you track guys run 225/45-17s? I have seen some photos of 17s on the ITR and it looks tall.

Depends on how many torques one has to deal with.
Don was running decent boost last I'd heard.

I'm going to be putting some 225/50/15 BFG R1 (61446) on a set of Volk 15x8's, stock final drive and a little more than double stock ITR torque (280 +) and 400+ Dynojet hp @ 8K and on ...


Ronin




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171 posts [100%]
5-30-2005
 « « » Reply  Edit


Any of you track guys run 225/45-17s? I have seen some photos of 17s on the ITR and it looks tall. Trying to sort out a final drive issue for the track with the K20 trans. Thanks
98 ITR - #456 sold
97 ITR - #97 sold
00 ITR - #1308 sold
98 ITR - #473 current
85 CRX-Si - current (original owner)



RTW DC2R
Bump drafting j00



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2312 posts [100%]
NYC
10-20-2002
 « Re: (Ronin)« » Reply  Edit


Quote, originally posted by Ronin »
Any of you track guys run 225/45-17s? I have seen some photos of 17s on the ITR and it looks tall. Trying to sort out a final drive issue for the track with the K20 trans. Thanks

Curious what kind of FD issues you are trying to sort out. Are you looking to run larger diameter tires to essentially have longer gearing?


98-0034 - Track Daze y0
00-XXXX - The OG NOPI Fish Tank Type R - SOLD

My For Sale thread ITR and Misc Parts For Sale


zygspeed
Got Boost ?

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385 posts [100%]
NE OH
9-25-2002
 « Re: (Ronin)« » Reply  Edit


Quote, originally posted by Ronin »
Any of you track guys run 225/45-17s?
I have seen some photos of 17s on the ITR and it looks tall.
Trying to sort out a final drive issue for the track with the K20 trans. Thanks

I like this M Factory gear ratio calculator, because you can put in particular tire sizes and select transmission type/gear ratios/Final Drive.
I'd guess for your purposes it would be the 02-04 RSX Type S under/in the predefined gear ratio tab/button.

http://calc.teammfactory.com/



Ronin




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171 posts [100%]
5-30-2005
 « Re: (RTW DC2R)« » Reply  Edit


I set my cars up to run at VIR. So dealing with the long straights is the issue. With the setup I have now, 2002 ITR trans and 15" wheels I'm basically running a 5.0 FD. I was trying to get a 5th gear setup with a redline around 150 mph. Want to stick with 15" wheels for many reasons. Looks like with my 4.7 FD and 225/45-15 tires I'll be topping out 5th at 125 mph and 156 mph in 6th.

Really would like to see 150 mph on the the back straight.


98 ITR - #456 sold
97 ITR - #97 sold
00 ITR - #1308 sold
98 ITR - #473 current
85 CRX-Si - current (original owner)



Rboosted717
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597 posts [100%]
CA
7-24-2011
 « Re:« » Reply  Edit


FYI - I'll be trying out two tire setups this year and likely back to back at the same events.

225/45/15 - Nitto NT01 on 15x8 wheels (TE37 w/32 offset)
225/45/15 - Toyo RR on 15x8 wheels (TE37 w/35 offset)

The weight of the tires is nearly identical as is the wheels. While I'm 100% positive the RR's will grip better then the NT01's, it will be interesting to see how they hold up. I've been a HUGE fan of NT01's and have been using them for a few years both for race use only and on a separate car for street use only (I commute on high speed highways and windy mountain road, and of course in sunny California weather).

Aside from driver feedback, I'll be using tire temp sensors on all four corners, dual three-axial accelerometer w/GPS position, shock pots, steering position and front/rear brake pressure sensors. Unfortunately I don't have real time tire pressure sensors but this setup should more then suffice.

I'll keep everyone posted when I do the test (likely in a month or two).


1998 ITR #108 "The Edmunds.com Collector Car"
1998 ITR #717 "For Drag Racing/Time Attack"
1998 ITR #731 "Retired Spa Francorchamps 24hr #38 - Hein/Green/Blackman & SPEED World Challenge Touring/Endurance Car #31"
1999 GSR "The Daily Driver/ITR Clone"
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coolhandluke
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13085 posts [100%]
HI
12-12-2005
 « Re: Re: (Rboosted717)« » Reply  Edit


From photos of 15x8's with NT01's and RR's, the NT01's appears to have a bulging side wall versus the RR. Does the RR offer a stiffer sidewall as a result?
98-1040
98-0197 - Sold
01-0187 - Sold
97' #171

ITR Expo 16 Event Photo Thread

 

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