ETR Posted October 8, 2021 Report Share Posted October 8, 2021 I'm starting to see these available at a few sources, has anyone tried them out yet? A bit more expensive but claim to be just a tick off the now unavailable RE71R's (in 15's) and supposedly more durable? Looking for feedback besides promo claims. I'm considering trying a set at Barber.... we've always run RS4's but they are terrible in the cold rain. Quote Link to comment Share on other sites More sharing options...
ETR Posted October 18, 2021 Author Report Share Posted October 18, 2021 Got some 225/45-15’s on the way from Phil’s tire, so we’ll see how they feel at barber. 1 Quote Link to comment Share on other sites More sharing options...
Wink Posted October 18, 2021 Report Share Posted October 18, 2021 10 hours ago, ETR said: Got some 225/45-15’s on the way from Phil’s tire, so we’ll see how they feel at barber. When did you order them? I tried to get some from Phil's before H2R and they were out almost instantly. I've had an order outstanding with TR since June, and haven't seen mine yet Quote Link to comment Share on other sites More sharing options...
turbogrill Posted October 18, 2021 Report Share Posted October 18, 2021 https://www.tirerack.com/tires/tests/chartDisplay.jsp?ttid=273 So a tad faster than the AD052? But they also showed RT660 being faster than A052, so not sure what to take form that. Quote Link to comment Share on other sites More sharing options...
ETR Posted October 18, 2021 Author Report Share Posted October 18, 2021 1 hour ago, Wink said: When did you order them? I tried to get some from Phil's before H2R and they were out almost instantly. I've had an order outstanding with TR since June, and haven't seen mine yet Saturday. Got an email from Kim within minutes of ordering saying “We’ve got two. You want those now or 4 headed your way in a few days when we get more?” ¯\_(ツ)_/¯ Quote Link to comment Share on other sites More sharing options...
TKRiggs Posted October 18, 2021 Report Share Posted October 18, 2021 3 hours ago, turbogrill said: https://www.tirerack.com/tires/tests/chartDisplay.jsp?ttid=273 So a tad faster than the AD052? But they also showed RT660 being faster than A052, so not sure what to take form that. You left out the brake and g-force graphs that provide an indiction of how "sticky" the A052 really is. I would venture to guess that the difference in time is due to the soft A052 sidewall and need for extra camber (not sure of the other tires' characteristics). I would think the A052 is probably still the "stickiest"....I'm definitely interested in knowing if any of the others will last 8 hours (or more). 1 Quote Link to comment Share on other sites More sharing options...
Grant Posted October 20, 2021 Report Share Posted October 20, 2021 We have a new set of Cooper RS3-Rs and Conti Extreme Forces. We may test them this weekend, or it may wait until AMP. The Coopers (255/40-17s) weigh in at 26.7 lbs and durometer 71. The Contis weigh 23.7 lbs and durometer 78. 2 Quote Link to comment Share on other sites More sharing options...
turbogrill Posted October 20, 2021 Report Share Posted October 20, 2021 Would the weight of a tires be interesting from a tire or grip perspective? Or is it just a factor to overall weight. Quote Link to comment Share on other sites More sharing options...
mhr650 Posted October 21, 2021 Report Share Posted October 21, 2021 Reducing unsprung and rotational weight is far more valuable than just reducing overall weight. Reducing unsprung weight makes the suspension work better, reducing rotational weight helps with braking and acceleration. 4 Quote Link to comment Share on other sites More sharing options...
turbogrill Posted October 21, 2021 Report Share Posted October 21, 2021 7 minutes ago, mhr650 said: Reducing unsprung and rotational weight is far more valuable than just reducing overall weight. Reducing unsprung weight makes the suspension work better, reducing rotational weight helps with braking and acceleration. So that is why tire weight is important? There is no other nerdy thing? Quote Link to comment Share on other sites More sharing options...
collinskl1 Posted October 21, 2021 Report Share Posted October 21, 2021 14 hours ago, Grant said: We have a new set of Cooper RS3-Rs and Conti Extreme Forces. We may test them this weekend, or it may wait until AMP. The Coopers (255/40-17s) weigh in at 26.7 lbs and durometer 71. The Contis weigh 23.7 lbs and durometer 78. Durometer is not an indicator of traction. It's way more complicated than that. Quote Link to comment Share on other sites More sharing options...
JDChristianson Posted October 21, 2021 Report Share Posted October 21, 2021 14 hours ago, Grant said: We have a new set of Cooper RS3-Rs and Conti Extreme Forces. We may test them this weekend, or it may wait until AMP. The Coopers (255/40-17s) weigh in at 26.7 lbs and durometer 71. The Contis weigh 23.7 lbs and durometer 78. Curious on your tire testing, how do you go about the process? Quote Link to comment Share on other sites More sharing options...
mhr650 Posted October 21, 2021 Report Share Posted October 21, 2021 11 hours ago, turbogrill said: So that is why tire weight is important? There is no other nerdy thing? Anything dealing with tires is really complicated, but those are 2 of the big hitters for sure. 1 Quote Link to comment Share on other sites More sharing options...
enginerd Posted October 21, 2021 Report Share Posted October 21, 2021 57 minutes ago, JDChristianson said: Curious on your tire testing, how do you go about the process? Looks like he used a durometer and a scale 1 1 Quote Link to comment Share on other sites More sharing options...
JDChristianson Posted October 21, 2021 Report Share Posted October 21, 2021 6 minutes ago, enginerd said: Looks like he used a durometer and a scale he's got me, I always use the thumb nail and give them a kick for pressure test 3 Quote Link to comment Share on other sites More sharing options...
Grant Posted October 21, 2021 Report Share Posted October 21, 2021 9 hours ago, collinskl1 said: Durometer is not an indicator of traction. It's way more complicated than that. Clearly. Tires were at the same temp when I Longacre durometered them, say 75F. Quote Link to comment Share on other sites More sharing options...
TKRiggs Posted October 22, 2021 Report Share Posted October 22, 2021 On 10/20/2021 at 9:47 PM, turbogrill said: So that is why tire weight is important? There is no other nerdy thing? In addition to what MHR stated....the "heavier" the tire usually means the "bigger" the tire...hence its heat tolerance should be greater. I know I don't think in terms of weight in relation to heat tolerance but rather size (255 vs 245 vs 235 etc.). In terms of weight I approach it exactly as MHR stated...reduction of unsprung and rotational weight is a good thing. Quote Link to comment Share on other sites More sharing options...
veris Posted December 22, 2021 Report Share Posted December 22, 2021 On 10/20/2021 at 3:40 PM, Grant said: We have a new set of Cooper RS3-Rs and Conti Extreme Forces. We may test them this weekend, or it may wait until AMP. The Coopers (255/40-17s) weigh in at 26.7 lbs and durometer 71. The Contis weigh 23.7 lbs and durometer 78. Did you ever test these tires? Thanks. Quote Link to comment Share on other sites More sharing options...
Grant Posted February 20, 2022 Report Share Posted February 20, 2022 (edited) On 12/22/2021 at 12:14 PM, veris said: Did you ever test these tires? Thanks. We ran 255/40-17s on my car at the Firm vs. Cooper RS3-Rs. They both run the same lap times down to a few hundredths (1:16.7). But the Contis are 3 lbs / tire lighter, have 1" less tread width, are harder, and run cooler. They also don't seem to want higher pressures despite being lighter. Lateral grip with the Contis was barely measurably higher, but we had more inside wheelspin issues (NC LSDs suck). So we are probably switching to Contis. They should hopefully last longer, and on some tracks we can't push 10/10ths all weekend on a single set of Coopers. Also the narrower tread width should make the car less of a water ski in the wet. I also expect the less weight and narrowness will help more on tracks with longer straights.@MJNOVA you guys may want to give the Contis a try. Edited February 20, 2022 by Grant 4 2 Quote Link to comment Share on other sites More sharing options...
mindspin311 Posted July 5, 2022 Report Share Posted July 5, 2022 Anyone else have experience on the Conti's? I'm itching to buy something to do some testing. Quote Link to comment Share on other sites More sharing options...
CoachMK21 Posted July 5, 2022 Report Share Posted July 5, 2022 56 minutes ago, mindspin311 said: Anyone else have experience on the Conti's? I'm itching to buy something to do some testing. Although not mentioned in this thread, @Grant used the Conti's at Ozarks with pretty good results. I forget which thread he talked about it, maybe one of the NC threads or the Ozark one. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted July 5, 2022 Report Share Posted July 5, 2022 (edited) 26 minutes ago, CoachMK21 said: Although not mentioned in this thread, @Grant used the Conti's at Ozarks with pretty good results. I forget which thread he talked about it, maybe one of the NC threads or the Ozark one. Uh, 2 posts above yours? Lolz. Well, he talked about them anyway. Not in relation to ozarks though. Yea, they won Sunday at ozarks and layer down some ridiculous times on them. Edited July 5, 2022 by wvumtnbkr 1 Quote Link to comment Share on other sites More sharing options...
ETR Posted August 14, 2022 Author Report Share Posted August 14, 2022 So we've done a couple sets of these and have really liked them, all from Phil's Tire with recent date codes. Just got a set from Tire Rack and they are over a year old, having spent winter in a cold warehouse I'd assume? These are older than the previous sets we've used before. Considering the intended use would you gripe about it? Quote Link to comment Share on other sites More sharing options...
TimS Posted August 14, 2022 Report Share Posted August 14, 2022 Yes Quote Link to comment Share on other sites More sharing options...
55mini Posted August 15, 2022 Report Share Posted August 15, 2022 7 hours ago, ETR said: having spent winter in a cold warehouse I'd assume I have been to Tire Rack and it is far from a cold warehouse and would think they will be fine. You can reach out and ask for peace of mind they have great customer service. Quote Link to comment Share on other sites More sharing options...
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