R-Comp comparison and Impressions thread for HS - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 34 (permalink) Old 07-06-2012, 12:55 PM Thread Starter
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R-Comp comparison and Impressions thread for HS

I've been rotating through 4 different kinds of r-comps this season and wanted to share my thoughts and impressions on them in case some of you are interested. Here is what I've been running this year.

245/45/16 C71 Hankook:
I love this tire. I have gone through several sets the last couple of seasons. Great value, great performance. They feel like they have tons of grip. Decent life, I usually get 60-70 runs out of them with flipping. They seem to taper off pretty gradually as they go through their usable life cycle. They will fall off with co-drivers on hot days even with spraying. Great tire for single driver cars or co-driven cars on cool to warm days.

245/45/16 C51 Hankook
Just started using this tire this year and got a set at a nice discounted rate so decided to take a gamble. This is Hankooks medium compound tire that is commonly used in road racing more than AX. This tire has been quite a pleasant surprise. As I expected, once hot they perform quite well. On 90+ degree days with co-driver these things love the heat and the results indicate just as fast as C71's or faster in similar conditions. These tires do not require spraying and I would recommend against it because the hotter they get the better they seem to work. For hot weather, this tire is a good choice. Should see longer life than the C71's as well which is a bonus. If you've used V710's in the past and like them, you'll like these. Similar grip, long wear and they handle heat as well or better than the 710's.

225/50/16 Hoosier A6
Gold standard for autocross and the benchmark. I've always liked the Hoosiers, but given their price premium kind of expect more. Results indicate they aren't much if any faster than the other less expensive options out there. They don't feel like they have more grip than the others and some times it feels like less, they do however have better feel in slaloms and quick transitions compared to the others. Life is short, maybe 40ish runs typically out of a set and they fall off fast when they do go. They don't tolerate getting hot very well, so you're probably going to run into heat management issues on hot days especially with two drivers.

245/45/16 BFG R1-S
Just tried these tires last month at the Pro/Tour in Blytheville. First off you need to run huge pressure in the fronts compared to the other tires. I ran the usual pressure initially and it messed up the shoulder of the tire with some metal cordage showing after only 12 runs. Sidewall feels soft compared to others and these tires do not tolerate shoulder wear well like the others. It seems you need to drive on the top of the tire literally. My findings are they need 7 psi more than the other tires which puts me at 52 psi front. If you try these tires, start 10 psi higher than usual and pay close attention to the wear triangles on the sidewall. Do not allow tires to wear below the triangles or you will run into issues. Initial impressions to me, they feel very similar to the C71 Kook. More testing needed, but I'm not crazy about having to run that much pressure and they seem to have durability issues.

Here is a pic of the R1-S after 12 runs and 45 psi in the tire. As you can see they were rolling over a bit too much and require more pressure. Sidewall now f'ed on this tire.

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post #2 of 34 (permalink) Old 07-06-2012, 01:31 PM
PZ
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Re: R-Comp comparison and Impressions thread for HS

Why aren't you running the 245 Hoosiers?

Also, the R6's might be better on our car, especially on longer courses and on hot days.

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
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post #3 of 34 (permalink) Old 07-06-2012, 01:58 PM Thread Starter
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Re: R-Comp comparison and Impressions thread for HS

[quote author=PZ link=topic=211314.msg4246843#msg4246843 date=1341595893]
Why aren't you running the 245 Hoosiers?

Also, the R6's might be better on our car, especially on longer courses and on hot days.
[/quote]

I'm considering going to the 245 Hoosiers on the next set I get. The 225's run pretty wide, in fact as wide as the 245 Kooks so. Now that I have the Rotas with less than stock offset, 245 Hoosiers shouldn't be a problem. I was actually rubbing a little with stock rims and 225 Hoosiers in the past so 245's didn't seem prudent at that time. I agree, haven't run the R6 yet, but my guess is that you are right.
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post #4 of 34 (permalink) Old 07-06-2012, 02:22 PM
PZ
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Re: R-Comp comparison and Impressions thread for HS

On stock rims 245 Hoosiers will rub on the fender liner in lock to lock turns. Should probably be fine with the Rota's though.

I've always been faster on the 245's over the 225's.

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
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post #5 of 34 (permalink) Old 07-07-2012, 11:51 AM
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Re: R-Comp comparison and Impressions thread for HS

Great writeup! Perfect timing for me as I'm looking for an r-compound tire for track days. Have you ever run the Nitto NT01's? I understand they don't work well in autocross due to the need for heat in them, but that's not an issue for me.

2007 Mazda3 2.0L 5-Speed Black Sedan; Injen CAI; Vibrant Header; Magnaflow Exhaust; SRS Pulleys; Mazda5 Tranny; Exedy Stage2 Clutch/Flywheel; Koni Sport Shocks; HR Sport Springs; SPC Adj Rear Camber Arms; TriPoint Racing RSB; Corksport Mid-Chassis and 4-Point Braces; Centric Rotors; Hawk Pads; Technafit SS Brake Lines; AWR PMM; TRZ RMM, TM; Visual Garage Shark Fin; Sparco/Sabelt Seats; Sparco Harness Bar; Schroth/Racequip Harnesses; Enkei RPF1 w/NittoNT01
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post #6 of 34 (permalink) Old 07-07-2012, 12:30 PM Thread Starter
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Re: R-Comp comparison and Impressions thread for HS

[quote author=KCjohnny link=topic=211314.msg4247163#msg4247163 date=1341676318]
Great writeup! Perfect timing for me as I'm looking for an r-compound tire for track days. Have you ever run the Nitto NT01's? I understand they don't work well in autocross due to the need for heat in them, but that's not an issue for me.
[/quote]

I have run into people who autocross the NT01, but it's not that good for autocross applications which is all that I do. In terms of AX or track use, the NT01 is a "tweener" R-comp which means you can drive it on the street to and from the track and long distances. The NT01 has long life and good heat handling capabilities. For occasional non-competitive track days the NT01's are a good tire, however if you are doing time trials or competition runs, you will get smoked by the guys running Hoosier R6 or C51 Hankooks everything else being equal.
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post #7 of 34 (permalink) Old 07-07-2012, 12:40 PM
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Re: R-Comp comparison and Impressions thread for HS

That's great feedback Adam, thank you! I am interested in doing time trials, so I will consider the Hankook and Hoosiers. My concern with Hoosier R6s is that I've read they harden up very easily and thus have a very short lifespan.

2007 Mazda3 2.0L 5-Speed Black Sedan; Injen CAI; Vibrant Header; Magnaflow Exhaust; SRS Pulleys; Mazda5 Tranny; Exedy Stage2 Clutch/Flywheel; Koni Sport Shocks; HR Sport Springs; SPC Adj Rear Camber Arms; TriPoint Racing RSB; Corksport Mid-Chassis and 4-Point Braces; Centric Rotors; Hawk Pads; Technafit SS Brake Lines; AWR PMM; TRZ RMM, TM; Visual Garage Shark Fin; Sparco/Sabelt Seats; Sparco Harness Bar; Schroth/Racequip Harnesses; Enkei RPF1 w/NittoNT01
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post #8 of 34 (permalink) Old 07-07-2012, 01:02 PM Thread Starter
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Re: R-Comp comparison and Impressions thread for HS

[quote author=KCjohnny link=topic=211314.msg4247172#msg4247172 date=1341679209]
That's great feedback Adam, thank you! I am interested in doing time trials, so I will consider the Hankook and Hoosiers. My concern with Hoosier R6s is that I've read they harden up very easily and thus have a very short lifespan.
[/quote]

You'll see a similar short lifespan with the C51 Kooks as well compared to the Nitto's. I'm not sure how extensive your track experience is, but if you're just getting started, I'd honestly start with the Nitto's or a high performance street tire first, then move to the more serious R-rubber later. Good rubber is no replacement for seat time and driving skill. We recommend the same to novice autocrossers. Learning to drive well on Hoosiers or something similar gets expensive quick and people seem to transition well from street tires to good r-rubber once they have proper technique and skills.
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post #9 of 34 (permalink) Old 07-07-2012, 01:09 PM
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Re: R-Comp comparison and Impressions thread for HS

[quote author=KCjohnny link=topic=211314.msg4247172#msg4247172 date=1341679209]
My concern with Hoosier R6s is that I've read they harden up very easily and thus have a very short lifespan.
[/quote]

R-comps (any R-Comp) harden because of heat cycles. If you are running track days you will go through the tires before they are heat cycled out.

2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
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post #10 of 34 (permalink) Old 07-07-2012, 02:56 PM
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Re: R-Comp comparison and Impressions thread for HS

[quote author=Adam3s link=topic=211314.msg4247179#msg4247179 date=1341680556]
You'll see a similar short lifespan with the C51 Kooks as well compared to the Nitto's. I'm not sure how extensive your track experience is, but if you're just getting started, I'd honestly start with the Nitto's or a high performance street tire first, then move to the more serious R-rubber later. Good rubber is no replacement for seat time and driving skill. We recommend the same to novice autocrossers. Learning to drive well on Hoosiers or something similar gets expensive quick and people seem to transition well from street tires to good r-rubber once they have proper technique and skills.
[/quote]

I absolutely agree! I've done about 7+ track days (always with instructors). I know I could squeeze about 10-20% more performance out of the Dunlops, but I don't like the idea of using the same tire for daily driving and mulitple track days (I've done 3 this season, and plan to do at least 5 more this year). After all of the research I've done on R-Compound tires, the feedback from fellow forum members, and a driving instructor's recommendation (a SpecE30 BMW racer who said the NT01 is a great r-compound transitional tire for the money and my HPDE non-timed needs i.e. I'm only racing against my own best time) I'm going with the Nitto NT01.

On my 2007 Mazda3 i-touring 2.0L 4door sedan, I've been told to go with either:

225 40/17 Nitto NT01 on 17
or
225x45-17 on 17 X 7.5

Any recommendation on which size is the better choice???

2007 Mazda3 2.0L 5-Speed Black Sedan; Injen CAI; Vibrant Header; Magnaflow Exhaust; SRS Pulleys; Mazda5 Tranny; Exedy Stage2 Clutch/Flywheel; Koni Sport Shocks; HR Sport Springs; SPC Adj Rear Camber Arms; TriPoint Racing RSB; Corksport Mid-Chassis and 4-Point Braces; Centric Rotors; Hawk Pads; Technafit SS Brake Lines; AWR PMM; TRZ RMM, TM; Visual Garage Shark Fin; Sparco/Sabelt Seats; Sparco Harness Bar; Schroth/Racequip Harnesses; Enkei RPF1 w/NittoNT01
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