[ZM2]

Originally Posted by to_riffic

Well, one of my Cup2 tires delaminated at the track today. I didn't want to waste the rest of the afternoon, so I decided to take my "street" FI-R's which had the 71RS' mounted to them.

I gotta say, that grip felt substantially better than the Cup2s. Maybe I'm used to the Cup2's after all these months running them at the track, but turn-in was crisp and gripped for dear life. My buddy was in the car with me that only session and he felt how immense the grip was on tip in and just holding throughout the session. Fantastic tire that I set at 30psi cold and I'm not sure where it stood after a handful of laps, but that was solid

Cup 2’s are overrated. No idea why folks run them. Average at everything, and expensive.

Glad you like the 71RS’s!

[to_riffic]

Originally Posted by ZM2

Cup 2’s are overrated. No idea why folks run them. Average at everything, and expensive.

Glad you like the 71RS’s!

TR was erroring out on me last night, I was ready to buy a replacement set on my Cup2's!

I will say though, that the 275 rears do rub a bit on big bumps.

[M1500Z]

RE71-RS report

275/35-18 square
M2 Comp w/stock power
14k/12k spring rates
-3.2º fr/-2.3º rr camber
3700 lbs with driver and full tank
50/50 cross weight

I tried to keep them ~34psi hot, sometimes going to 35 which seemed ok. Higher than that and I found it obvious because front-end grip would drop off a decent bit. With the above alignment and pressures, I wore them right to the tip of the ∆ front and rear.
I'll compare these to the Falken RT660 since it's previously the fastest tire I've driven on and also the last tire I used.

Pros

• The lateral grip is great. If you've driven the RT660, the RE71-RS is a hair less but with a hint more slip angle, but this didn't seem to make them slower necessarily.
• Feedback is excellent and I never felt surprised by the tire. The RT660 has a stiffer sidewall and while turn-in feels fantastic it's borderline excessive and the tire can be shocked a little easily.
• The slightly softer sidewall/carcass seems to do a good job of damping imperfections, adding confidence and working really well with vehicle.
• They're audibly communicative as well—something I like.

Cons

• I think this is the most heat-sensitive tire I've driven. I actually had to let up and let them cool off every now and again. I found the RT660s (and the Goodyear SC3 before them) to follow a similar pattern of peak>drop ~20%>plateau. They could be overheated, but it took over-driving or being ham-fisted. The RE71-RS needs more monitoring.
• Inner shoulder and center-bar wear is something to keep an eye on. After 2 days they look ok, but showing a little more wear and beveling than I'd have expected.

[to_riffic]

damn -3.2 degrees up front and you still have a bit of wear in the mid tread there.

[ZM2]

Originally Posted by M1500Z

RE71-RS report

275/35-18 square
M2 Comp w/stock power
14k/12k spring rates
-3.2º fr/-2.3º rr camber
3700 lbs with driver and full tank
50/50 cross weight

I tried to keep them ~34psi hot, sometimes going to 35 which seemed ok. Higher than that and I found it obvious because front-end grip would drop off a decent bit. With the above alignment and pressures, I wore them right to the tip of the ∆ front and rear.
I'll compare these to the Falken RT660 since it's previously the fastest tire I've driven on and also the last tire I used.

Pros

• The lateral grip is great. If you've driven the RT660, the RE71-RS is a hair less but with a hint more slip angle, but this didn't seem to make them slower necessarily.
• Feedback is excellent and I never felt surprised by the tire. The RT660 has a stiffer sidewall and while turn-in feels fantastic it's borderline excessive and the tire can be shocked a little easily.
• The slightly softer sidewall/carcass seems to do a good job of damping imperfections, adding confidence and working really well with vehicle.
• They're audibly communicative as well—something I like.

Cons

• I think this is the most heat-sensitive tire I've driven. I actually had to let up and let them cool off every now and again. I found the RT660s (and the Goodyear SC3 before them) to follow a similar pattern of peak>drop ~20%>plateau. They could be overheated, but it took over-driving or being ham-fisted. The RE71-RS needs more monitoring.
• Inner shoulder and center-bar wear is something to keep an eye on. After 2 days they look ok, but showing a little more wear and beveling than I'd have expected.

I find that if you run a staggered setup (275/295 for me) it forces you throttle steer the car more and produces less wear on the front.

Altho, my fronts still picked up a lot of heat. I just assumed it was bc I’m running 480whp and needed to add the AP 9449’s on the back to go with my front 9660’s to help keep front brake & tire temps lower.

[AUSf22]

Originally Posted by M1500Z

RE71-RS report

275/35-18 square
M2 Comp w/stock power
14k/12k spring rates
-3.2º fr/-2.3º rr camber
3700 lbs with driver and full tank
50/50 cross weight

I tried to keep them ~34psi hot, sometimes going to 35 which seemed ok. Higher than that and I found it obvious because front-end grip would drop off a decent bit. With the above alignment and pressures, I wore them right to the tip of the ∆ front and rear.
I'll compare these to the Falken RT660 since it's previously the fastest tire I've driven on and also the last tire I used.

Pros

• The lateral grip is great. If you've driven the RT660, the RE71-RS is a hair less but with a hint more slip angle, but this didn't seem to make them slower necessarily.
• Feedback is excellent and I never felt surprised by the tire. The RT660 has a stiffer sidewall and while turn-in feels fantastic it's borderline excessive and the tire can be shocked a little easily.
• The slightly softer sidewall/carcass seems to do a good job of damping imperfections, adding confidence and working really well with vehicle.
• They're audibly communicative as well—something I like.

Cons

• I think this is the most heat-sensitive tire I've driven. I actually had to let up and let them cool off every now and again. I found the RT660s (and the Goodyear SC3 before them) to follow a similar pattern of peak>drop ~20%>plateau. They could be overheated, but it took over-driving or being ham-fisted. The RE71-RS needs more monitoring.
• Inner shoulder and center-bar wear is something to keep an eye on. After 2 days they look ok, but showing a little more wear and beveling than I'd have expected.

Good to hear your feedback! I 100% agree with the heat sensitivity, after 2 hotlaps this tyre requires a cooldown and the grip doesn't necessarily come back fully after the cooldown lap either.

My suggestion would be to try to run 30-32psi hot, I found that is the sweet spot for the RE71RS on the tracks I go.

Give that a go and see if you notice a difference, my opinion (no proven data) is 34psi hot is a bit on the high side.

[-Eidos]

How do these compare to the Nankang CRS and RT660s?

[ZM2]

Originally Posted by -Eidos

How do these compare to the Nankang CRS and RT660s?

https://grassrootsmotorsports.com/ar...-buyers-guide/

[-Eidos]

Originally Posted by ZM2

https://grassrootsmotorsports.com/articles/track-tire-buyers-guide/

Based on this, it's pretty much a superior tire to the RT660?

[ZM2]

Originally Posted by -Eidos

Based on this, it's pretty much a superior tire to the RT660?

I haven’t driven them back to back, but both GRM & Tirerack think so.

Altho, wear seems a little better with the 660, and you have to manage heat a bit more with the 71RS. It could end up that the 71RS is better for lighter cars, but the 660 doesn't come in sizes I like so it's not even a contender for me.

[M1500Z]

In that GRM comparison, there are a couple things worth noting:

• As ZM2 pointed out, there is the fact that the RE-71RS could be better for lighter cars given the test was on a Miata.
• The RT660 runs wider so they compared a size smaller in the RT660 to try and compensate for this.
• The RT660 they tested was at full tread and that tire does get faster as the tread depth becomes shallower. They stated a worn RT660 ran a similar time to the fastest time of the new Bridgestone during a previous test.

showed the Bridgestone slower than it's competitors in the dry on it's [short] test track, but most of us don't drive on tracks that take under 30s to lap.

If I can get similar longevity out of the RE-71RS as I did with the RT660, I will continue to use them. I think their drivability, wet-weather prowess, and characteristics outweigh the cons of them being easier to heat soak and higher costs.

[MR RIZK]

FWIW M1500Z I find the 30-32 psi hot for the RE's the sweet spot as noted above..

Running -3.1º fr/-2.1º rr camber and -2.5/+3mm toe I find that I still need a bit more camber. Fronts wear to nearly the tip of the ∆, so maybe need another .1 or .2. I don't have a pyrometer.

I run a significantly softer spring at front of 7Kg and 10kg rear on c/o setup however run a fair amount of low-speed compression and sometimes bump up the gas pressure to compensate for track days as it is my daily.

Personal opinion i prefer the RE's over the Cup 2. Wasn't a fan of the Cup 2's and the RE so much better in the wet.

[medphysdave]

I ran these this weekend. 34-35 was where I put down the best and more consistent times. At 30-31 I noticed increased front end squirm during braking. The increased pressure seemed to significantly limit this.

[Charles33982]

Bump, assuming I should have no rubbing issues running 255/35/19 + 275/35/19 RE-71RS on a bone stock 2021 M2C with the factory 788M's ?

[medphysdave]

I think you can go 265/285 no problem, but hopefully someone more knowledgeable will chime in. I'm not sure if they come in those sizes though.

[flybigjet]

Originally Posted by Charles33982

Bump, assuming I should have no rubbing issues running 255/35/19 + 275/35/19 RE-71RS on a bone stock 2021 M2C with the factory 788M's ?

I'm running those sizes with Michelin Pilot Sport 4S and PS Cup 2's on Apex EC-7's with the M-P coilover suspension.

The clearance is *tight* but doable. Based on that, I fully expect that the 255/35/19 & 275/35/19 combination will work fine on stock components.

R.

[Brokenbones]

Originally Posted by Charles33982

Bump, assuming I should have no rubbing issues running 255/35/19 + 275/35/19 RE-71RS on a bone stock 2021 M2C with the factory 788M's ?

same tire same car same wheels
no issues so far except much more grip than original PSS
enjoy!

on track I do agree they heat up quickly and then overheat within a few laps.
wore a set down to chords in 4 really hot 115 degree track days without camber plates.
with camber plates at 3.1 degrees have mid rib wear like the previous guys tires, shoulder looks decent after 1.5 track days

[Charles33982]

Originally Posted by Brokenbones

same tire same car same wheels
no issues so far except much more grip than original PSS
enjoy!

on track I do agree they heat up quickly and then overheat within a few laps.
wore a set down to chords in 4 really hot 115 degree track days without camber plates.
with camber plates at 3.1 on 1.5 track days and have mid rib wear like the previous guys tires, shoulder looks decent

Thanks!

[bhong]

FYI, Tire Rack now has OEM sizes for the RE-71RS. Was going to try 255/275 but now thinking of sticking with stock sizes. Anyone have experience with 245/265 setup?

[CSBM5]

Originally Posted by bhong

FYI, Tire Rack now has OEM sizes for the RE-71RS. Was going to try 255/275 but now thinking of sticking with stock sizes. Anyone have experience with 245/265 setup?

I just went with a new set of them in stock sizes as I simply wanted to try them out on my autox/track wheels. Given the recent TR wheel width vs performance data from TR, I decided what the heck, let's go back to stock sizing. They replaced a set of 255/35-19, 275/35-19 RE-71R. These are mounted on OZ Racing wheels with stock widths and offsets.

It's all subjective of course, so my reply on the one size up or not is really not meaningful especially since the RS is a good bit different responding/feeling tire versus the R. It would be an interesting test to instrument and evaluate that simple one size up change on stock wheel widths like TR did in their wheel width test. As a general rule, for decades I've always preferred the night taught response you get from a wheel width approaching or at the maximum wheel width range shown for a size by the TRA. It's likely one of the reasons BMW chose these sizes for the 9"/10" wheels too (sharpness of response, feedback, etc).

On to the RE-71RS review...My 2019 M2C is 100% stock. It's the only BMW I've owned in over 45+ years of BMW ownership that I've not at least modified the suspension on. I bought it new in Sept 2018 with an early M2C allocation, and it has 20k miles on it now. It's a little beast on fast autox courses.

Right off I noticed the RS is quieter on typical street driving than the RE-71R. The R had very loud "sizzle" (engineering term for when a tread void area traps air and compresses it in the contact patch) going over pavement marking stripes and other pavement features. That's gone on the RS for the most part. I feel like they are a bit more comfortable than the R also, a bit more compliant in typical street driving which is a bonus for those wanting to daily drive it.

I entered the BMWCCA MiX event here locally again this year, and we had a triple course autocross at the Performance Center yesterday, so it was a great place to try them out. Three courses, 7 total runs on each course, 6 of them for timed competition. The net was they performed superbly, and I exploited them as best I could to capture 2nd place out of 30 on each course (at least I was consistent!).

The pros have all been covered above, and I agree with them. It was ~85F here yesterday, and they were ready to go immediately. I kept them at 34psi hot and didn't experiment further with pressures. Unlike a "regular" autocross, here you are essentially hot lapping almost since as soon as you come off course, you circle around into the creeping staging line with the 9 other cars in your group, so there was very little time between runs. That part threw off my normal mental review/rehearsal I do between runs at a normal autox where you have a lot of time between runs. On course #1 (which is an interesting combination of asphalt on the track, a transition to the cement skidpad for a while, then back onto the asphalt track), the turnaround for staging in the parking lot had a huge deep puddle that I used every time, nice and slowly...

Versus the RE-71R, the RS feels less "sharp". Others have commented about it too, and I experienced what they meant. It's got huge grip of course, but your "feeling" of that isn't a precise as the R as you approach the peak and go over the top. If you've ever driven on the BFG Rival, it's that type of feeling. The Rival feels better leading up to the limit however, and the Rival is more forgiving around the limit. The RS isn't bad per se, but in one higher speed sweeper I once over did the trail braking on turn-in and abruptly lost the front grip - lesson learned though, never did that again the rest of the day.

For those with experience in the response between the PSS and the PS4S, it's a similar thing here with the R to the RS -- more ultimate grip with the successor tire but less sharpness in response (slightly less slope on the force vs slip angle chart).

For the most part the rest of the day I always got my fastest run when I felt I had left a tad on the table, and the RS punished me if I tried to "find more" on the next run. So in retrospect that was a great thing to feel, to store that feeling and settle into it with the tire as I was likely able to stay on the left side of that force/slip angle response near the peak limit a lot on course, and the RS gave me enough feedback to enable that.