Boca Raton FL
My 2025 M40 violently fishtails under hard acelleration' Can run flat tires handle the torque? What tires will get the best traction?
My 2025 M40 violently fishtails under hard acceleration-traction control engaged. Can run flat tires handle the torque? Any suggestions?
- Thread starter bocamichael
- Start date
What tyres have you got on at the moment?
And are you looking for road tyres, or some track action too?
This is a mostly UK forum but we do have a few members across the pond who might be able to help with tyre recommendations available in the US.
And are you looking for road tyres, or some track action too?
This is a mostly UK forum but we do have a few members across the pond who might be able to help with tyre recommendations available in the US.
I'd ditch the runflats asap. Have had debris puncture normal tires (got very unlucky last summer) and I have yet to have a sudden blowout due to that.
I personally run 200tw tires as they provide the most dry grip, I rarely drive my car in winter, and they hold up on track. I'd probably recommend Kumho V730s or Hankook RS4s. They aren't the grippiest, but wear very well compared to others in the category. The category as a whole is a lot less comfortable, faster wearing, and more sketchy in anything but dry conditions, and requires warmup to grip properly.
If that's too hardcore, I think the best daily + occasional fun tires which can be used year round (except for snow, but you're in FL) are probably Conti ECS02s or Michelin PS4S. Definitely grippy enough for some backroads but doesn't feel like you have enormous grip or heat resistance like the 200tw category. Those are two tires I'd probably run on my daily.
I always get my tires from tirerack, so I'd check out their offerings for the category while suits you best.
To be honest though, if you're having fishtailing issues I'd look into what's causing that. Shouldn't be just because of bad tires. Are you accelerating too quickly while turning? Generally the grippier the tire the higher the consequences if you get it wrong; our cars love to snap back hard if you do something you shouldn't be doing, that trait is especially pronounced with more grip.
I personally run 200tw tires as they provide the most dry grip, I rarely drive my car in winter, and they hold up on track. I'd probably recommend Kumho V730s or Hankook RS4s. They aren't the grippiest, but wear very well compared to others in the category. The category as a whole is a lot less comfortable, faster wearing, and more sketchy in anything but dry conditions, and requires warmup to grip properly.
If that's too hardcore, I think the best daily + occasional fun tires which can be used year round (except for snow, but you're in FL) are probably Conti ECS02s or Michelin PS4S. Definitely grippy enough for some backroads but doesn't feel like you have enormous grip or heat resistance like the 200tw category. Those are two tires I'd probably run on my daily.
I always get my tires from tirerack, so I'd check out their offerings for the category while suits you best.
To be honest though, if you're having fishtailing issues I'd look into what's causing that. Shouldn't be just because of bad tires. Are you accelerating too quickly while turning? Generally the grippier the tire the higher the consequences if you get it wrong; our cars love to snap back hard if you do something you shouldn't be doing, that trait is especially pronounced with more grip.
The G29 M40i doesn’t come with runflats in the UK, are you sure they’re runflats in the US?
The Michelin Supersports are a little twitchy when cold in the damp or wet, they definitely need some heat in them.
Anything with decent power and torque can drive as you describe if RWD, have you switched traction and DSC off?
The Michelin Supersports are a little twitchy when cold in the damp or wet, they definitely need some heat in them.
Anything with decent power and torque can drive as you describe if RWD, have you switched traction and DSC off?
At the summit of the picturesque fens
I had Michelin PSSs on my E92 Alpina. They were all over the place in the cold. It was scary and fun in equal measure.
Scotland 🏴
I'll think you'll find that a few G29 owners have experienced the rear stepping out, I got caught out one night at a round-a-bout on a dual carriageway, maybe a bit too much accelerator in sport+ mode, didn't catch it in time and the car ended up facing the wrong direction, luckily the road was empty. On reflection maybe the tyres (Michelin Pilots) weren't warm enough and it had been raining earlier.
North West Surrey
Not a G29 but my current E86 had MPSS tyres fitted when I bought it and driving it home on a drizzly grey day below 10 degrees C in December they were hopeless on every roundabout, even after over 100 miles of warming up!
They were great in the summer, but I like to use my car all year.
I've never been a fan of Michelin anyway. They just seem over-priced to me.
They were great in the summer, but I like to use my car all year.
I've never been a fan of Michelin anyway. They just seem over-priced to me.
They're summer tires, no? Honestly I dunno how much warming up will occur with normal driving when the road is already so cold. I couldn't even get my M's tires up to temp in ~5C weather with 20 minutes of track driving. It was just a skating rink out there for everyone.
Sounds like someone needs to learn to drive better by modulating their right foot.
When I was a kid, one of the first things my motorcycle instructor taught us was to be extra careful on roundabouts, especially ones near fuel stations. Buses and lorries can slop diesel on them which makes them rather slippy.
Don't know if diesel tanks are any better sealed these days, but it's still worth noting IMO.
Thats what i blame my one and only spin on a public road on... definitely some spilt diesel, definitely not a severe lack of talent combined with the abundant confidence of youth...
Conti 7's are the best tyres I've had on my M40's. Two new rear ones a couple of weeks ago to replace the factory fitted ones. Hate the Michelins with a passion.
The MPSS nearly put me in the barrier once in the M4 in the wet as well Mr Tidy. I had let them get pretty worn though, so that was my fault really. The car just snapped out without warning, and that was definitely the closest I've ever got to smashing it up(touchwood). I've had it 5 years and done 46k miles in it now, and I'm on MPS4S now, but I agree they do seem expensive versus the competition though as you say.
The Continental SC7's always seem to come well regarded from what I read.
Car should be bonging and pinging if thats the case. If they're anywhere outwith 0.2 bar (I think) of where they should be the screen tells you every time you start/stop that the tyre pressure needs addressed as its not within permitted range. This isn't something you set like low tyre pressure reset etc, it's inbuilt
I blamed my first spin as a junior idiot…ahem sorry… confident youth on too much handbrake mid-corner
My (also not a G29) Zed on MPSS struggled to pull away on a gentle incline after the first rain for a couple of weeks.
It's easy to get the rear to step out pulling away at a junction, both times Ive done it the traction control has caught it before it hit the opposite kerb, our other car is AWD electric, you can boot that at a junction or roundabout, not the M40.
I found the Michelin and the conti 6
BMW star marked tyres require so much warmth before they grip.
The conti 7 which isn’t star marked gave me much better grip without having to thrash them and I’m going back to them. Downside is that they don’t last as long.