M4CS tyre choice

[stevehifi]

best option is Michelin mp4s for the street and RE71R for the track.

Cup2s arent a very good street tire and an they are an average track tire. they dont last long either and are very expensive

[DS_BMW]

Originally Posted by jmg

Just wanted to add my experience so far with this setup:

Currently running PS4S 265/35R19 and 295/30/R20. I had SS 285's in the rear paired with the PS4S 265's in front while I was waiting for the PS4S 295's to come in, and while I am no expert, I felt the 295's in the rear were better matched not only aesthetically, but dynamically.

This past weekend I went with a more aggressive -2.4 rear camber (factory was -1.75 after MPHAS installation). -2.7 in front. That paired with corner balancing has changed the handling characteristics of the car noticeably. The goal was to increase front end grip and tame that rear end on high speed cornering. I'll report back in a few weeks after I hit the track again.

Do you have any pics of the rears? I was thinking of 295 PS4S if they dont balloon out to much. Is the traction better first two gears?

[jtskariah]

Originally Posted by CanAutM3

That seems like a lot of rear camber. On my previous M4, I ran -1.6 in the rear and was getting perfect wear and temperature distribution across the tread. On my CS with MP-HAS, I increased rear camber to -1.8 (don't ask why I did, I guess I just wanted to experiment ) and I am now getting suboptimal temperature distribution and wear (inside wearing faster). I will dial it back down to -1.6 in the spring when I get it aligned before the track season.

As for the tires, my M4cs came with PSC2 (I am in Canada). The 265/35R19 with 295/30R20 PS4S was the setup I originally wanted to get after my PSC2 had worn out. I figured I already had a dedicated set of tires and wheels for the dry track and needed a DD friendly tire as well as a wet track tire, hence the PS4S. However, after a full season of driving on the PSC2, I decided to stick with them. I heard all sort of stories about how horrible they are in the wet, but a very wet track day proved this to be completely wrong. I was quite impressed with the performance of the PSC2 on a drenched track. I like the added crispness and grip the offer on the DD and they perform well enough on the wet.

I just bought a set of Pilot sport 4s for my M4CS on tirerack with the standard sizes - 255 35 19 in the front BMW spec and 285 30 10 in the rear BMW spec. Will the 265 35 19 front and 295 30 20 rear setup provide significant benefit to switchover or should I stay with the stock sizes? I daily drive this car with the occasional track day. I want to make the best long-term decision if possible

[CanAutM3]

Originally Posted by jtskariah

I just bought a set of Pilot sport 4s for my M4CS on tirerack with the standard sizes - 255 35 19 in the front BMW spec and 285 30 10 in the rear BMW spec. Will the 265 35 19 front and 295 30 20 rear setup provide significant benefit to switchover or should I stay with the stock sizes? I daily drive this car with the occasional track day. I want to make the best long-term decision if possible

Note that the 255/35R19-285/30R20 combo is NOT the "standard" size for the M4cs. The CS was really developed around the 265/35R19-285/30R20 PSC2. BMW just went lazy when offering the PSS option on the CS, with the front tire being from the base 19" star spec PSS and the rear from the Comp pack 20" star spec.

[jtskariah]

Originally Posted by CanAutM3

Note that the 255/35R19-285/30R20 combo is NOT the "standard" size for the M4cs. The CS was really developed around the 265/35R19-285/30R20 PSC2. BMW just went lazy when offering the PSS option on the CS, with the front tire being from the base 19" star spec PSS and the rear from the Comp pack 20" star spec.

That makes sense, thank you for the info! So I should probably get a set of 265/35R19-285/30R20 for the PS4S so the car runs as close to intended (in absence of a solid set of cup 2s of course)

[CanAutM3]

Originally Posted by jtskariah

That makes sense, thank you for the info! So I should probably get a set of 265/35R19-285/30R20 for the PS4S so the car runs as close to intended (in absence of a solid set of cup 2s of course)

I would also strongly consider the G8X star spec PS4S, in 275/35R19-285/30R20 sizes. Independent testing has show the G8X star spec PS4S to be far superior to the generic PS4S.

[jtskariah]

Originally Posted by CanAutM3

I would also strongly consider the G8X star spec PS4S, in 275/35R19-285/30R20 sizes. Independent testing has show the G8X star spec PS4S to be far superior to the generic PS4S.

Did not think about this! This sounds promising, I wish I could see how this looks on stock suspension with the CS

[Wanted_M]

Originally Posted by jtskariah

Did not think about this! This sounds promising, I wish I could see how this looks on stock suspension with the CS

Ask and you shall receive, its an M3CS but close enough
https://f80.bimmerpost.com/forums/sh...1893320&page=4

[CanAutM3]

Originally Posted by Wanted_M

Ask and you shall receive, its an M3CS but close enough
https://f80.bimmerpost.com/forums/sh...1893320&page=4

Note that these (in the linked thread) are PSC2, but it does give a general idea of how they will look.

[jtskariah]

Great as always! You guys have all the answers!

[Wanted_M]

Originally Posted by CanAutM3

Note that these (in the linked thread) are PSC2, but it does give a general idea of how they will look.

Rugby's are the new 275/285 M3 tires.

[CanAutM3]

Originally Posted by Wanted_M

Rugby's are the new 275/285 M3 tires.

Understood, but they are the PSC2, not the PS4S. Both are options for the G8X.

[Auroraz]

Originally Posted by CanAutM3

I would also strongly consider the G8X star spec PS4S, in 275/35R19-285/30R20 sizes. Independent testing has show the G8X star spec PS4S to be far superior to the generic PS4S.

Hello CanAutM3 and everyone else on this thread!
I don't mean to revive an old post but I was wondering if you had any suggestions/feedback for me?

https://f80.bimmerpost.com/forums/sh....php?t=1926975

I wrote a lot on here but to revise I wanted to know how big of a tyre can I go on the 763m staggered setup and what the best tyre compound/brand would be for daily and regular spirited driving.

I appreciate any advice in advanced!!

[hellokitty]

Originally Posted by Auroraz

Hello CanAutM3 and everyone else on this thread!
I don't mean to revive an old post but I was wondering if you had any suggestions/feedback for me?

https://f80.bimmerpost.com/forums/sh....php?t=1926975

I wrote a lot on here but to revise I wanted to know how big of a tyre can I go on the 763m staggered setup and what the best tyre compound/brand would be for daily and regular spirited driving.

I appreciate any advice in advanced!!

I run 265/35/19 and 285/30/20 on 763M.

Cup 2 connect (240) Star spec. The 285 is the same tire as on the new G8X and it puts power down quite nicely now that it's warmer.

[CanAutM3]

Originally Posted by hellokitty

I run 265/35/19 and 285/30/20 on 763M.

Cup 2 connect (240) Star spec. The 285 is the same tire as on the new G8X and it puts power down quite nicely now that it's warmer.

The 265/35R19 star spec PSC2 connect is the rear tire for the M2cs, not a ideal tire to run up front. It would be preferable to run the 275/35R19 star spec front tire from the G8X to match that G8X spec rear PSC2.

[hellokitty]

Originally Posted by CanAutM3

The 265/35R19 star spec PSC2 connect is the rear tire for the M2cs, not a ideal tire to run up front. It would be preferable to run the 275/35R19 star spec front tire from the G8X to match that G8X spec rear PSC2.

Tire rack configurator shows that is the correct fitment for a M3 CS.

Did the M3 CS come with PS4S from the factory then?

Another user ran 275 Star Cup 2 but this setup rubs on the F8X chassis.

[CanAutM3]

Originally Posted by hellokitty

Tire rack configurator shows that is the correct fitment for a M3 CS.

Tire Rack will just just show whatever nominal dimension fits. It is better to do deeper research.

Originally Posted by hellokitty

Did the M3 CS come with PS4S from the factory then?

No F8X were ever fitted with PS4S from the factory. F8Xcs came with the older gen 180TW PSC2, exact same tires as the F82 GTS. The CS could be optionally fitted with PSS, but BMW was lazy with that option by simply speccing the 255/35R19 star spec PSS from the base F8X paired with the 285/30R20 star spec PSS from the competition package. This is a really suboptimal setup for the CS IMO.

Originally Posted by hellokitty

Another user ran 275 Star Cup 2 but this setup rubs on the F8X chassis.

It rubs because he runs spacers. No rub without spacers...

As I posted several times, the G8X star spec tires, either in PS4S or PSC2 are probably the best setups for the F8Xcs. The OE tires on the F8X were its weakest point, the OE tires on the G8X are one of its strongest attributes.

[hellokitty]

Originally Posted by CanAutM3

Tire Rack will just just show whatever nominal dimension fits. It is better to do deeper research.

No F8X were ever fitted with PS4S from the factory. F8Xcs came with the older gen 180TW PSC2, exact same tires as the F82 GTS. The CS could be optionally fitted with PSS, but BMW was lazy with that option by simply speccing the 255/35R19 star spec PSS from the base F8X paired with the 285/30R20 star spec PSS from the competition package. This is a really suboptimal setup for the CS IMO.

It rubs because he runs spacers. No rub without spacers...

As I posted several times, the G8X star spec tires, either in PS4S or PSC2 are probably the best setups for the F8Xcs. The OE tires on the F8X were its weakest point, the OE tires on the G8X are one of its strongest attributes.

Thanks for your help! I'll definitely get a set of 275/35/19 Cup 2 Star for the front soon

[cuhounds]

Originally Posted by hellokitty

Thanks for your help! I'll definitely get a set of 275/35/19 Cup 2 Star for the front soon

hellokitty how do you like the 275 cup2's at the front?...i'm ready to place order, but a bit undecided between new gen cup2's or g8x spec'd 4s's....ty!

[CanAutM3]

Originally Posted by cuhounds

hellokitty how do you like the 275 cup2's at the front?...i'm ready to place order, but a bit undecided between new gen cup2's or g8x spec'd 4s's....ty!

Maybe RugbyBro can chime in here, he has the 275 G8X spec on his car.

[RugbyBro]

Originally Posted by cuhounds

hellokitty how do you like the 275 cup2's at the front?...i'm ready to place order, but a bit undecided between new gen cup2's or g8x spec'd 4s's....ty!

Originally Posted by CanAutM3

Mayby RugbyBro can chime in here, he has the 275 G8X spec on his car.

275 front is great - in relative terms it has extremely detailed feedback and has a heavier and noticeably more elastic feel when compared to PSS or PAS4. Ran them for 3 sessions on track this past Friday (1 dry-ish and 2 wet all at around 55 degrees F); my thoughts on the fronts:

- Lots of grip, goes where you want it to. Lots of steering information but tbh I care more that the front end goes where I point it over steering feel in this situation... regardless, both qualities are there.
- Cup 2s like a bit of heat; no surprise with this one. They're still good "cold" but really like a lap or two to get grippy.
- Overall, especially in the subpar conditions, I was more worried about maintaining traction in the rear over understeering. Had no notable understeer issues the entire day when on the Cup 2s. Once I get my camber plates on, I'll set more negative camber up front to further increase grip and combat uneven wear.

One potential con:

- This one is not necessarily exclusive to Cup2s but running a 275 in front will further amplify the CS's desire to follow the road surface. If you're not dialed in when driving, and the road surface changes direction your car will want to go that direction. It makes the steering and drive a much more lively experience. I personally don't think of this as a con, however, I can appreciate that some people may not like a car that you have to wrestle with from time to time.

[hellokitty]

Originally Posted by RugbyBro

275 front is great - in relative terms it has extremely detailed feedback and has a heavier and noticeably more elastic feel when compared to PSS or PAS4. Ran them for 3 sessions on track this past Friday (1 dry-ish and 2 wet all at around 55 degrees F); my thoughts on the fronts:

- Lots of grip, goes where you want it to. Lots of steering information but tbh I care more that the front end goes where I point it over steering feel in this situation... regardless, both qualities are there.
- Cup 2s like a bit of heat; no surprise with this one. They're still good "cold" but really like a lap or two to get grippy.
- Overall, especially in the subpar conditions, I was more worried about maintaining traction in the rear over understeering. Had no notable understeer issues the entire day when on the Cup 2s. Once I get my camber plates on, I'll set more negative camber up front to further increase grip and combat uneven wear.

One potential con:

- This one is not necessarily exclusive to Cup2s but running a 275 in front will further amplify the CS's desire to follow the road surface. If you're not dialed in when driving, and the road surface changes direction your car will want to go that direction. It makes the steering and drive a much more lively experience. I personally don't think of this as a con, however, I can appreciate that some people may not like a car that you have to wrestle with from time to time.

One thing to help with bump steer is this:

https://www.splparts.com/products/bm...djustable.html