[ThreeStripes]

Originally Posted by ZM2

Good article at GRM about RE-71RS & RT660 performance as they wear: https://grassrootsmotorsports.com/ar...d-longer-life/

How has your experience been with RE71RS in regards to this? I think I’ve got another 2 full days left in this current set which will be the first full set I’ve taken all the way. Hoping I find the GRM thesis tracks…

[OG Shark]

Originally Posted by ZM2

Good article at GRM about RE-71RS & RT660 performance as they wear: https://grassrootsmotorsports.com/ar...d-longer-life/

Solid article - thanks for the heads up

Originally Posted by ThreeStripes

How has your experience been with RE71RS in regards to this? I think I’ve got another 2 full days left in this current set which will be the first full set I’ve taken all the way. Hoping I find the GRM thesis tracks…

Are you talking about getting faster towards the end as the tread works down? Can say that if I have any serious competition I would absolutely have the money set shaved and heat cycled before primetime for pretty much any treaded tire.

The last part are you wanting to know what track it is that they do this testing on? If so I know exactly what it is.

[ThreeStripes]

Yeah curious if they’ll get faster. Really if I will. I know the car did haha.

[OG Shark]

Originally Posted by ThreeStripes

Yeah curious if they’ll get faster. Really if I will. I know the car did haha.

You better with the new suspension

I would be curious how much the weight makes a difference between the F87 and their test miata on long term pace on these tires. Certainly lower tread will help but wonder if the increased abuse from a heavier car would counter it.

[ZM2]

Originally Posted by ThreeStripes

How has your experience been with RE71RS in regards to this? I think I’ve got another 2 full days left in this current set which will be the first full set I’ve taken all the way. Hoping I find the GRM thesis tracks…

My experience is the 71RS is fast when brand new, grip drops some to mid life, then gets quicker until dead.

Sounds like it’s a tire that definitely needs heat cycling to balance out its grip performance thru its life.

[M1500Z]

Originally Posted by OG Shark

I would be curious how much the weight makes a difference between the F87 and their test miata on long term pace on these tires. Certainly lower tread will help but wonder if the increased abuse from a heavier car would counter it.

I'd have to go back and check data, but I'm pretty confident that this would be a good tire to run a decent pace with longer term if they aren't full tread. My experience on the sets I've run has been heat tolerance and speed only get better the more the tire wears. I can also say I haven't found a difference in using Tire Rack's heat cycling service vs. not.

I know quite a few WRL teams run this tire so I'd be curious to hear experiences on them. Alternatively, last time I was in the WRL pits at COTA, a lot of teams were running A052s which seems very odd to me given that tires' supposed heat tolerance weakness.

[OG Shark]

Originally Posted by M1500Z

I'd have to go back and check data, but I'm pretty confident that this would be a good tire to run a decent pace with longer term if they aren't full tread. My experience on the sets I've run has been heat tolerance and speed only get better the more the tire wears. I can also say I haven't found a difference in using Tire Rack's heat cycling service vs. not.

I know quite a few WRL teams run this tire so I'd be curious to hear experiences on them. Alternatively, last time I was in the WRL pits at COTA, a lot of teams were running A052s which seems very odd to me given that tires' supposed heat tolerance weakness.

Yeah the not full tread is the key I think too. My concern was the the heavier cars (especially the piggy dct comps) would outweigh the tread loss with the increased stress from the weight. Good to see that is not happening with you guys though. I think with WRL even though they A052 greases up a bit more they still overall hold on longer and is either a net gain in pace and/or much friendlier on the budget with less sets being used. Also maybe with the lighter cars they run now they don't grease up as bad too? Couple of years ago with I ran WRL at COTA last we had A052 on an M4 GT4 but it was such a hot mess of a bad suspension setup couldn't get a good read on their longevity.

[jwr9152]

I had an opportunity to speak with a Bridgestone engineer that worked on the RE71RS and asked him this very question. He said it is more of a hero lap tire and falls off fairly quickly, but he said some of the endurance guys have had luck running it at higher pressures and getting fairly consistent performance out of it. He said it definitely does not get faster as the tread wears.

[M1500Z]

Originally Posted by jwr9152

I had an opportunity to speak with a Bridgestone engineer that worked on the RE71RS and asked him this very question. He said it is more of a hero lap tire and falls off fairly quickly, but he said some of the endurance guys have had luck running it at higher pressures and getting fairly consistent performance out of it. He said it definitely does not get faster as the tread wears.

It's interesting that the engineer you spoke to is using absolutes regarding wear vs. speed when it goes against many reports and experiences from a variety of sources (that GRM article included). Check out this video from TireRack where they talk to Bridgestone's Director or US Product Strategy about the tire—I know, not an engineer that worked on the tire. The whole video is decently interesting—especially the bits comparing it to the previous RE-71R and about the tire's wet weather performance—but what pertains to our conversation starts at ~9:32, where TJ discusses running the tire in endurance racing and the tire getting faster over the life.

[jwr9152]

Originally Posted by M1500Z

It's interesting that the engineer you spoke to is using absolutes regarding wear vs. speed when it goes against many reports and experiences from a variety of sources (that GRM article included). Check out this video from TireRack where they talk to Bridgestone's Director or US Product Strategy about the tire—I know, not an engineer that worked on the tire. The whole video is decently interesting—especially the bits comparing it to the previous RE-71R and about the tire's wet weather performance—but what pertains to our conversation starts at ~9:32, where TJ discusses running the tire in endurance racing and the tire getting faster over the life.

Yeah, I watched that video when it came out. I know Will and have talked to him about it as well, because of this video and what I was hearing from some early adopters and a pro driver. He pretty much reitereated what the engineer told me. I know its only anecdotal, but my experience has been it was very fast for a lap or two and would drop off quickly after that. At least for me the tire last for a long time, but was only fast for the first few sessions. Fantastic in the wet, as long as there isn't any standing water. Will be interesting to see how the knowledge of this tire goes. Could be a ambient temperature, pressure, car weight kind of thing.

[E90convert]

I'm about to pull the trigger on either VS5-RS 18x10 +40 and 12mm spacers or TA16 +33 and 5mm spacers. Spacers and wheel bolts from Apex. These will be track wheels only. The tires will be Kumho V730 275/35-18

Before I click buy... is there anything else I need to consider? I am stock suspension OG M2 with -3 degrees front camber and -2 degrees rear camber.

[dvas]

Originally Posted by E90convert

I'm about to pull the trigger on either VS5-RS 18x10 +40 and 12mm spacers or TA16 +33 and 5mm spacers. Spacers and wheel bolts from Apex. These will be track wheels only. The tires will be Kumho V730 275/35-18

Before I click buy... is there anything else I need to consider? I am stock suspension OG M2 with -3 degrees front camber and -2 degrees rear camber.

Double check your offsets. It's been a while since I researched my setup so apologies if I'm wrong, but your offsets and/or spacers seem incorrect.

For comparison, I have an OG M2 and run:
- Apex SM-10 18x10 33ET square (12mm spacer up front)
- Nitto NT01 275/35/18 square

[ZM2]

Originally Posted by dvas

Double check your offsets. It's been a while since I researched my setup so apologies if I'm wrong, but your offsets and/or spacers seem incorrect.

For comparison, I have an OG M2 and run:
- Apex SM-10 18x10 33ET square (12mm spacer up front)
- Nitto NT01 275/35/18 square

Agreed. ET25 (what I run) is minimum IMO for an 18x10 wheel with a 275 up front.

[E90convert]

Thanks. I’d effectively be at a +28 or +21 with the stock suspension depending on the spacer. With the +25 front, do you have more than 3mm clearance?

Other thought is I could run an 18x9.5 +35, and use a 12mm spacer to get +23. This seems more friendly for both front and rear, but I am giving up 1/2 inch, smaller than the car comes with stock in the rear!

[ZM2]

Originally Posted by E90convert

Thanks. I’d effectively be at a +28 or +21 with the stock suspension depending on the spacer. With the +25 front, do you have more than 3mm clearance?

Other thought is I could run an 18x9.5 +35, and use a 12mm spacer to get +23. This seems more friendly for both front and rear, but I am giving up 1/2 inch, smaller than the car comes with stock in the rear!

Nope, less than 3mm clearance.

9.5 is too narrow for a 275.

[E90convert]

Originally Posted by ZM2

Nope, less than 3mm clearance.

9.5 is too narrow for a 275.

What suspension are you running?

I did just find this https://f87.bimmerpost.com/forums/sh...1346915&page=2

18x10 513M with a 12mm spacer (effectively +28) just barely clears the stock suspenion. It would seem like +28 is ok for stock, but would need to switch to +21 to clear coilovers. What do you think?

Going with the 5mm spacer is appealing because I can just leave it on for my stock winter wheels and 19x9.5 ET28 front rain/street wheels

[E90convert]

Reading through Apex’s fitment guide it seems like they try to push you into a +20 to +25 offset for a 10” and 275 front setup. Even if 5mm does fit, Seems like I should just get the 12 mil spacers so I don’t have to rebuy them when I put coilovers on

[CSBM5]

Originally Posted by ZM2

Nope, less than 3mm clearance.

9.5 is too narrow for a 275.

9.5 is the standard width used in the TRA measuring guide for a 275/35 and is used by lots of manufacturers as OE sizing (i.e. rear of E39 M5 for example). The rim width range in the TRA guide is 9-11".

That said, I'm always in the camp for "the wider the wheel the better" for decades, and it was nice to see the extensive Tire Rack testing recently showed that with such detail. On my M3 I'm running 275/35-19 in the rear on a 10.5" wheel, and it is the perfect size for the tire imo.

[ZM2]

Originally Posted by CSBM5

9.5 is the standard width used in the TRA measuring guide for a 275/35 and is used by lots of manufacturers as OE sizing (i.e. rear of E39 M5 for example). The rim width range in the TRA guide is 9-11".

That said, I'm always in the camp for "the wider the wheel the better" for decades, and it was nice to see the extensive Tire Rack testing recently showed that with such detail. On my M3 I'm running 275/35-19 in the rear on a 10.5" wheel, and it is the perfect size for the tire imo.

Because we’re in the track section of the forum, 275 is too wide for a 9.5. Better performance will come with a 265 on a 9.5. Altho, I know we’re agreeing on this.

That said, I’m running a 295 on a 10.5 wheel in the back. Would rather it be an 11” but didn’t want to risk clearance issues and wheel width isn’t as critical in the rear. At least it’s saving me a whole 0.5lb per wheel, and an extra inch of clearance when my track wheelset is in my backseat…hah!

[E90convert]

Originally Posted by ZM2

Agreed. ET25 (what I run) is minimum IMO for an 18x10 wheel with a 275 up front.

I went with the VS-5RS ET40 18x10 square with a 15mm front spacer. It had an ideal fit in the rear compared to Bimmerworld, and with the 15mm spacer, it had a better fit in the front, effectively making it a +25. Plus I could go to an 18x11 in the rear if I wanted to go back to staggered.

[FaRKle!]

Originally Posted by ZM2

Agreed. ET25 (what I run) is minimum IMO for an 18x10 wheel with a 275 up front.

x10 ET28 works fine on stock type dampers (I ran ET33 with 5mm spacer). x10 ET25 pokes a bit in the back doesn't it?

[ZM2]

Originally Posted by FaRKle!

x10 ET28 works fine on stock type dampers (I ran ET33 with 5mm spacer). x10 ET25 pokes a bit in the back doesn't it?

18x10 ET25 275/35
18x10.5 ET40 295/35 RE-71RS is my setup

Running Bilstein PSS10, which is pretty close to stock suspension spring width.